FWPC/FWPS/FWS/FWP
PLATE EXCHANGERS FOR INSTANTANEOUS DOMESTIC
HOT WATER PRODUCTION IN BLOCK OF FLATS
FWPC: instantaneous DHW calorifiers, with a low
primary temperature return for condensing boilers
up to 750 kW
FWPS: instantaneous DHW calorifiers, with
integrated preheating loop (solar or heat pump) for
boilers up to 217 kW
FWS
Instantaneous DHW.
For connecting to a boiler with an
exchanged outpout of 50 to 750 kW
FWS: primary storage calorifiers for
instantaneous domestic hot water production
employing a heat exchanger in the form of an
integrated coil, for boilers up to 280 kW
FWP: instantaneous DHW calorifiers, with low Δ
of temperature for boilers up to 650 kW
FWPC
FWPS
FWP
FWPC: Range of calorifiers for instantaneous domestic hot water production,
constructed using a movable plate exchanger on a base. Thanks to a primary
return temperature to 30°C, it is possible to optimise the efficiency of the
condensing boiler systems for domestic hot water (DHW) flow rates, at 60°C,
of up to 13 m3/h and powers up to 750 kW.
FWPS: Range of instantaneous domestic hot water calorifiers with solar or
heat pump preheating system, for DHW flow rates at 60°C of up to 5.5 m3/h
and powers up to 217 kW.
D
H
(Qi¡la¡f_
HUJL
\
$
$
%
&
'
(
)
*
FWPC/FWPS equipped with primary
pumps class A, with energy efficiency
index EEI < 0.23
Legionella
EQUIPMENT
FWS: Range of calorifiers for instantaneous domestic hot water production,
combining primary storage and the production of DHW in the same volume,
optimising the efficiency of the system by solar of heat pump preheating
and a condensing boiler contribution, for DHW flow rates at 60°C of up to
2.5 m3/h and powers up to 280 kW.
FWP: range of calorifiers for instantaneous domestic hot water production
with a primary having a 't of 25 K, for DHW flow rates up to 11 m3/h and
outputs up to 650 kW.
CONDITIONS OF USE
Primary circuit
Working temperature:
- FWPC: 70/30°C
- FWPS 70/20°C
- FWS: 70/20°C
- FWP: 70/50°C
Max. operating temperature:
- FWPC/FWPS/FWP: 110°C
- FWS: 90°C
Max. operating pressure:
- FWPC/FWPS/FWP: 10 bar
- FWS: 6 bar
Secondary circuit
Working temperature: 10/60°C
Max. operating temperature: 90°C
Max. operating pressure:
- FWPC/FWPS/FWP: 10 bar
- FWS 750: 7 bar
- FWS 1500: 10 bar
PRESENTATION OF THE RANGES
RANGES FWPC/FWPS/FWP
Our ranges of instantaneous DHW calorifiers are all constructed
using a removable plate heat exchanger, mounted on a rigid
frame to be installed on the ground. They are equipped with
a double primary pump and with a mixing valve installed and
connected on the autonomous regulation. The assembly is tested
and delivered, ready to use on a film-wrapped pallet, to be
connected to a heat generator.
¹ FWPC
70°C
0
2
4
6
8
10
12
14
16
18
20
22
FWPC
70°C
24
0
30
l
FW_F0003B
Low-temperature DHW calorifiers for use with a condensing
boiler. The primary return temperature, fixed at 30°C,
ensures the condensation function of the boiler, which enables
a considerable reduction in energy consumption; the integrated,
ultra-responsive and precise regulation contributes actively to
these energy savings - see page 10.
30°C
¹ FWPS
70°C
FWPS
70°C
0
0
2
4
6
8
10
12
14
16
18
20
22
24
30
FW_F0004B
Multi-energy DHW calorifiers for use with renewable energy
preheating of the solar or heat pump type. The primary return
temperature, fixed at 20°C, ensures maximum efficiency of the
renewable energy contribution to the system, controlled by the
integrated, ultra-responsive and precise regulation - see page 11.
l
20°C
¹ FWP
>70°C
6A
0
FWP
30
l
FW_F0002B
DHW calorifiers for use with conventional boilers or an urban
heat network with low 't or primary (wood-fired boiler for
example), allowing simple integration into any existing system see page 12.
RANGE FWS
¹ FWS
FWS
FW_F0013
Multi-zone DHW calorifiers which can be connected to all types
of generators, with the option of connecting a solar energy
or heat pump circuit. It is composed of a buffer tank with
temperature stratification and heat exchanger in the form of a
high-performance stainless steel coil incorporated in the tank. see page 13.
2
CHOICE OF DHW PRODUCTION PRINCIPLE
FW
50°C
FW_F0014
The domestic hot water system must be chosen in full knowledge
of the facts, in order to ensure continuous DHW availability at the
desired flow rate and:
- In the individual residence, at the desired temperature in
order to ensure the comfort wished for by the user - for those
establishments requesting it, at the temperature required to
avoid proliferation of legionella and set by the DUT. One of the
recommendations for health institutions, schools, public buildings,
etc. is that the DHW production be instantaneous, i.e. without
storage, and that the return temperature of the recirculation loop
on the plate heat exchangers be maintained at above 50°C.
The estimate of the DHW requirement is important for
defining the system and its components.
Our FW and other calorifier products respond to these
prerogatives:
- The FWS combines instantaneous DHW production with primary
storage in the same volume.
- The FWPC, FWPS and FWP are defined for instantaneous DHW
production.
¹ DHW production using plate heat exchangers
Instantaneous DHW production
Semi-instantaneous DHW production
Solution involves storing the domestic hot water immediately
or rapidly meeting large needs and is therefore subject to the
constraints relating to legionella: minimum storage temperature,
superheating cycle, periodic cleaning of the tank, etc. It is also
applicable for replacement of components in boiler rooms and
our products are entirely suitable for this purpose.
Benefits of instantaneous DHW production with primary storage
- Also enjoy the advantages of semi-instantaneous DHW
production, including reduced generator power and/or
allowing it to shutdown or at least decrease its temperature
when DHW is not being drawn,
Advantages of our product solutions
- delivers significant productivity gains in DHW production by:
• limitation of the Primary inlet temperature required to 70°C,
• a primary return temperature allowing condensation of the
boiler and/or effective integration of renewable energies in
the system (FWPC/FWPS),
FW_F0015
FW
FW_F0015
FW
For new installations or major renovations, we advise against
semi-instantaneous systems with DHW storage in favour of
instantaneous DHW production systems with primary storage
(solution ).
- Removes any risk of the presence of legionella in the DHW
distribution, while ensuring that a suitable quantity is available
at the desired temperature.
• precise control of the system with Class A, low consumption,
modulating primary pumps, having energy efficiency index
EEI < 0.23.
Note: In this document, we will only describe this type of
instantaneous DHW production system although, of course,
we have products for all types of installation.
3
CHOOSING THE DOMESTIC HOT WATER CALORIFIER
The domestic hot water calorifier must be chosen in full knowledge
of the facts in order to ensure permanent DHW availability at the
desired temperature.
It is therefore important accurately to determine the DHW needs
necessary to meet this requirement, which depends largely on the
number of people living in the home and their consumption habits.
It will also depend on the risk of legionellosis, which would direct
the choice towards a calorifier with instantaneous DHW production
(solution we recommend).
Below are a number of points which may help you in this choice :
DETERMINING YOUR DOMESTIC HOT WATER NEEDS
Determining these needs will condition :
- The choice of the DHW calorifier’s capacity;
- The power of its exchanger;
- And possibly the power of the generator with which it is
combined.
Actual needs will therefore have to be determined for a given
temperature over a given duration (hour/day) and the peak
flows (litre/minute) assessed according to DHW use at a given
moment. In collective housing, it will also mean factoring in
simultaneous use.
METHODS FOR DETERMINING YOUR DHW NEEDS
¹ Using the “DHW Needs” software available in our “DIEMATOOLS” offer
This software (or any other software which you may have
acquired) will offer you an effective guide in assessing your needs.
¹ Other methods
- Using the tables below, it is possible to approximate your daily
domestic hot water needs.
Station
to be supplied
Sink
kitchen
Sink
+ washbasin
+ shower
Number of
people
1-2
3-4
1-2
3-4
5-6
Important:
To determine the capacity of the DHW calorifier, it is necessary
to factor in any peak flows caused by simultaneous use at
different draw-off points in addition to these daily needs.
As for the calculation of the installation, this will have to be
made in accordance with prevailing standards.
Station
to be supplied
Washbasin +
small bathtub
Sink
+ washbasin
+ bathtub
Daily DHW needs
(L to 60°C)
30 to 40
40 to 50
75 to 95
120 to 170
150 to 190
Number of
people
1-2
3-4
1-2
3-4
5-6
Daily DHW needs
(L to 60°C)
50 to 75
80 to 120
90 to 150
150 to 240
145 to 340
Note: These tables do not cover multi-jet shower (艐 50 L/min) or «spa» type
bathtubs
Special cases: domestic hot water requirements in the tertiary sector
Hotels with no restaurant
Restaurants
Hotel categorie (number of stars)
DHW needs at 60°C (L/room/day)
no*
65
1*
75
2*
100
3*
135
4*
150
Campings
Restaurant
Canteen Restaurant
DHW needs at 60°C
(L/cover)
5
12
Restaurant
gastronomic
Breakfast
20
3
Hairdressing salons
Campings
DHW needs at 60°C (L)
by
location
45
camper
12
Number of basins
3
4
DHW needs at 60°C (L/day)
700
1000
Collective housing - Health - Sports and other Complexes
DHW
needs at
60°C
Collective housing Retirement Hospitals
Home
F1 F2 F3 F4 F5 home and clinics disabled
L/day
L/bed/day
50 75 100 150 200
40
50
100
Gyms
Stadiums
30
45
Plant
Military
swimming
Offices
Internat
barracks
pool
(cloakroom)
L/person/day
20
30
Example:
The DHW needs of a building with 21 apartments, comprised in the following manner:
3 one-room apartments, thus 3 x 50 L
5 two-room apartments, thus 5 x 75 L
7 three-room apartments, thus 7 x 100 L
thus: i.e.: Total maximum daily DHW: 225 L at 60°C
4 four-room apartments, thus 4 x 150 L
2 five-room apartments, thus 2 x 200 L
}
4
30
5
20
CHOICE OF THE DHW PRODUCTION SYSTEM AND TYPE OF CALORIFIER
CONNECTION PRINCIPLE OF A BOILER (OR CASCADE OF BOILERS) TO A FWPC, FWPS OR FWP CALORIFIER
To ensure optimum operation of the FWPC, FWPS or FWP with
a boiler, it is essential to decouple the calorifier circuit from the
boiler; this can be done through a disconnecting cylinder which
will provide total satisfaction for the operation of the FWPC,
FWPS and FWP. By contrast, there will be a tendency to request
repetitive heating of the boiler if it is not continuously maintained
at the DHW setpoint temperature to ensure water draw-off or
to maintain the temperature of the recirculation loop.
FW
6A
0
30
FW_F0016A
l
 Solution not recommended with FWPS or FWPC
Since our boilers have distinct features for heating and
DHW production, with lowering and/or modulation of the
temperatures according to the demand, we recommend the
installation of primary storage in place of a disconnecting
cylinder in order:
- to allow the operation of the boiler at lower temperatures for
heating than for the production of DHW
- to allow and to favour condensation with the FWPC, FWPS
and FWS
- to allow shutdown at night or outside of periods when DHW is
being drawn-off from the boiler, to reduce the consumption for
maintenance
- to avoid frequent or repetitive restarts during very low drawoff of water and/or for temperature maintenance in the
recirculation loop.
FW
6A
0
30
FW_F0016A
l
Optimisation of condensation
To ensure the DHW needs by reducing as much as possible the
time for the boiler to raise the temperature and to condense
we recommend the installation of a reversal valve with
thermostatic control on the boiler outlet, which will switch
over this valve to the top of the primary storage when the inlet
temperature to the valve has reached the DHW setpoint of the
boiler.
FW
70°C
0
0
2
4
6
8
10
12
14
16
18
20
22
24
30
FW_F0023
l
Recommended solution
This principle (establishment of a primary storage) will be
adopted for all these configurations in collective housing,
retirement homes, hospitals, etc., with a DHW setpoint of 70°C
for the boiler, in order to both ensure a secondary outlet
temperature to the DHW heat exchanger of 60°C and, above
all, to protect the heat exchanger from lime scale deposits
that largely occurs at temperatures greater than 75°C at the
secondary level. This low temperature of 70°C implies a slight
oversizing of the plate exchanger but is offset by gains in terms
of energy consumption and maintenance.
DEFINITION OF THE COMPONENTS OF A DHW PRODUCTION SYSTEM
To ensure correct functioning of the system and to meet the needs
of the installation, the components should be defined as follows:
햲 DHW calorifiers FWPC, FWPS, FWP and FWS:
Refer to the maximum instantaneous flow rates given on
page 12.
햳 Boiler output:
The boiler power should be equivalent to at least that of
the DHW calorifier selected. The boiler will also be sized to
ensure that the heating and DHW needs are met.
Remember: Our boilers are modulating and thus incorporate
output reduction allowed by the primary storage on the
calorifier.
햴
Primary buffer volume:
To be defined as a function of the boiler power; see following
page.
5
CHOICE OF THE DHW PRODUCTION SYSTEM AND TYPE OF CALORIFIER
Definition of the buffer volume to be associated with the FWPC, FWPS and FWP calorifiers
The table below indicates the advised primary buffer volume to
This volume takes account of the boiler connection to our buffer
install according to the power of the plate exchanger or DHW
tanks in the PSE range (see page 15) either at 3 points with
flow required.
zone reversal valve as recommended above, or on the midpoint
connection for the boiler contribution.
Boiler output range
DHW flow rate with ' 50 K
⭐ 120 kW
⭐ 170 kW
⭐ 260 kW
⭐ 400 kW
⭐ 600 kW
⭓ 750 kW
⭐ 2.1 m3/h (35 L/min) (1)
⭐ 3.0 m3/h (50 L/min)
⭐ 4.5 m3/h (75 L/min)
⭐ 6.9 m3/h (115 L/min)
⭐ 10 m3/h (170 L/min)
⭐ 13 m3/h (215 L/min)
Buffer volume recommended with
FWPC
FWPS with solar
500 L
500 L + 1, 500 L solar (⬍ 30 m2 collectors)
750 L
750 L + 2 ,000 L solar (⬍ 40 m2 collectors)
1,000 L
1,000 L + 2 ,500 L solar (⬍ 50 m2 collectors)
1,000 L
2 ,000 L + 3, 000 L solar (⬍ 60 m2 collectors)
2,000 L
3,000 L
-
FWP
500 L
500 L
500 L
750 L
1,000 L
2,000 L
(1) In this flow range, it is possible to ensure DHW production using calorifiers with integrated buffer volume: FWS 750 and FWS 1500
DHW PRODUCTION WITH CONDENSING BOILER WITHOUT RENEWABLE ENERGIES
¹ With DHW calorifier FWPC
21
7
7 1 2
3
4
2
6
4
8
12
10
14
16
18
20
22
10
24
30
l
70°C
124
27
9
166
32
9
AD212
27
30
9
29
28
16
C230 ECO
26
PSE
FWPC
50
9
FW_F0017A
0
0
18
In this scenario, we recommend DHW
calorifiers from our FWPC range, which
ensure a return at 30°C during water
draw-off. This allows condensation to be
optimised for the boiler and thus provides
energy savings of up to 7 % more than
for a conventional instantaneous DHW
production.
Thanks to the modulating pumps fitted to
our FWPC, electrical consumption is also
reduced by more than 50 %.
Coupled with our condensing boilers, this
provides the most economic instantaneous
DHW production that can be installed in
low energy consumption buildings, without
risks to health and with simple maintenance
and easily accessible use.
System optimisation
21
7
7 1 2
3
4
10
0
2
4
6
8
10
12
14
16
18
20
22
24
0
30
l
124
27
9
AD212
166
32
9
27
16
C230 ECO
PSE
EC680
50
9
Key: see page 15
6
46
18
26
FWPC
30
29
9
28
FW_F0018A
70°C
The reversal valve with its sensor (package
EC 680 - optional, see page 9), connected
on the outlet of the FWPC calorifer, allows:
- Optimisation of the stratification in the
bottom of the buffer volume, - to promote
condensation during restarts of the DHW
heating
- avoidance of reheating of the bottom of
the buffer tank by the recirculation loop.
DHW PRODUCTION WITH CONDENSING BOILER AND RENEWABLE ENERGIES
THE USE OF RENEWABLE ENERGIES DIRECTLY REDUCES THE VOLUME OF THE BOILER’S PRIMARY BUFFER
¹ FWPC calorifier + reversal valve (package EC 680), optional, see page 9
112a
131
21
7
1 2
7
3
4
10
2
0
6
4
8
10
12
14
16
18
20
22
24
0
30
l
70°C
124
27
AD212
AD250
166
9
32
9
27
30
29
9
28
16
C230 ECO
26
PSE
50
9
FWPC
EC680
AD 276
112b
CCI
18
AD 275
CAN BUS
230V
50Hz
24V
OU
132
FW_F0019A
DKCS
8-30
39
PGA38
The boiler is connected on the buffer tank with a
boiler return on the lower volume corresponding to
the renewable energy contribution zone. The upper
part of the storage tank (DHW boiler sensor in the
upper part, outside the renewable energy zone)
allows optimum functioning of the FWPC/boiler
combination as previously described, while allowing
a low temperature renewable energy contribution
of the solar or heat pump type to the bottom of
the buffer volume.
The cold return (30°C) from the FWPC allows,
via the 3-way reversal valve (package EC 680
- optional), a renewable energy contribution
in all scenarios in the event of water draw-off.
This solution is used for a renewable energy
contribution that is rapid and higher in temperature
because of the relatively low volume to be heated
and that actively contributes, in a simple way, to
temperature maintenance of the recirculation loop
which often represents a significant yet poorly
identified source of energy consumption.
SOLAR ENERGY ON A SPECIFIC DEDICATED BUFFER VOLUME
¹ FWPC calorifier + reversal valve (package EC 680) and preheating sensor (package EC 681), optional, see page 9
This solution involves connecting the
21
7
112a
FWPC (or FWPS) directly to the buffer
7 1 2
3
131
volume of the boiler and connecting
4
the primary solar tank in series to the
10
renewable energy zone of the boiler
70°C
124
9
buffer volume.
32
Note: An expansion volume is not
AD212
166
9
27
27
30 29 9
recommended for a renewable
28
16
energy contribution with heat pump.
26
C230 ECO
PSE
FWPC
The dedicated renewable energy
EC680
50
EC681
9
18
volume in the boiler buffer tank being
Diemasol A
sufficient for the proper functioning
of the system. In this case, the boiler’s
*
DHW sensor will have a dedicated
112b
DKS
volume (at the top). In all other cases,
132
8-20
the boiler’s DHW sensor remains in the
renewable energies volume.
* - DHW sensors supplied:
*
0
2
4
6
8
10
12
14
16
18
20
22
24
0
30
l
FW_F0021A
230V
50Hz
- with FWPC
- with DIEMASOL regulation
PS
¹ FWPS DHW calorifier
112a
131
21
7
7 1 2
3
4
10
0
2
4
6
8
10
12
14
16
18
20
22
24
0
30
l
70°C
124
27
9
32
166
AD212
9
26
27
16
PSE
C230 ECO
29
9
28
FWPS
50
9
30
*
18
*
* - DHW sensors supplied:
- with FWPC
- with DIEMASOL regulation
Key: see page 15
112b
PSE
DKCS
8-30
132
FW_F0020A
230V
50Hz
This solution involves connecting
the FWPS to the upper part of the
boiler buffer volume and connecting
the primary solar buffer tank in
series to the renewable energy zone
of the solar buffer volume. Given
the low temperature (20°C) at the
outlet of the FWPS exchanger, the
solar contribution will be almost
continuous, even with very little sun.
This solution allows passage
through the solar buffer volume
to recuperate solar energy if it is
contributed or, if there is no solar
contribution, short-circuiting of this
tank to go directly to the boiler
buffer volume (boiler DHW sensor
at the top of the renewable energy
zone).
7
DHW PRODUCTION WITH CONDENSING BOILER AND RENEWABLE ENERGIES
¹ FWS DHW calorifier
The upper part (DHW) of the FWS
can be loaded by boilers installed in
cascade supplying the heating circuits
and the DHW circuit connected to
the heating collector. The solar circuit
is connected to the lower part of
the tank for DHW preheating (or
DHW heating if the solar back-up is
insufficient). A heating circuit can be
connected to S1/S2 for a swimming
pool, for example.
The FWS can operate without a
renewable energy input (diagram
on p. 14) or with renewable energy
contribution to its buffer volume
(diagram opposite) or with a specific
solar buffer volume at the bottom of
the FWS (see FWPS diagram, p. 7).
For more details, see the DIETRISOL
technical sheet for collectives.
112a
131
DKCS 8-50
21
2
1
2
1
FWS
11
7
109
27
8
MCA
9
9
132
35
S1
13
33
28 29 30
S3
112b
16
16
FW_F0024
S2
Note: Our DHW calorifiers from the FWS range are suitable for
replacing the 3 ranges FWPC, FWPS and FWP, but only for low
DHW throughputs limited to 2.5 m3/h
DHW PRODUCTION ECS WITH CONVENTIONAL BOILERS
¹ FWP DHW calorifier
21
1
2
7
3
4
6A
0
30
l
10
27
166
16
50
32
9
9
Key: see page 15
8
18
27
PSE
FW_F0022A
9
AD212
26
FWP
30
29
9
28
The calorifiers from our FWP
range are characterised by a high
return temperature that does not
allow condensation. This solution is
reserved for replacements of existing
conventional boilers or heat networks.
Management of the primary buffer
tank is ensured by the boiler’s DHW
sensor located in the bottom of the
buffer tank. The buffer tank pump
should be sized according to the
useful power of the boiler, to ensure
the setpoint temperature at the boiler
outlet.
PLATE EXCHANGERS FOR INSTANTANEOUS DHW OF THE FWPC RANGE
DESCRIPTION – STRONG POINTS
The DHW calorifiers from the FWPC range consist of a
removable plate exchanger on a base with double modulated
primary pump (pump with energy efficiency index EEI < 0.23 ),
reactive 3-way mixing valve, and proactive regulation unit for a
constant and instantaneous DHW temperature regardless of the
flow rate (up to 13 m3/h at 60°C).
- Compact, robust and reliable product, mounted and wired
in the factory, supplied tested in accordance with the EU
directives 73/23EC and PED 97/23EC Article 3.3
- Unique primary flow rate control concept to ensure a low
return temperature (30°C) in order to optimise condensation in
the boiler.
- Operates with a primary at 70°C to limit scaling in case of very
hard water
- «Plug & Run» control for autonomous proactive control of the
calorifier in instantaneous or semi-instantaneous mode. With
ECO and BOOSTER functions, alarm reporting, anti-clogging,
permutation of the pumps, thermostat, emergency and other
tests for simple use and self-adapting to the various installations
- ModBus RTU communication for cascading or remote access
with recording of the mode of operation.
MAIN DIMENSIONS
FWPC 200
FWPC 400, 600, 800, 900
B
A
420
143
1
2
1
4
4
1183
1535
1535
92
92
2
1224
880
880
240
97,5
203
140
335
C
92
240
500
530
818
839
97,5
140
FW_F0011
FW_F0010
3
3
F
500
D
E
335
Key
햳 Primary outlet:
- FWPC 200: Rp 1
- FWPC 400, 600, 800, 900: R 1 1/2
햴 Cold water inlet: Rp 2
햵 DHW outlet: Rp 2
햲 Primary inlet:
- FWPC 200: Rp 1
- FWPC 400: Rp 1 1/4
- FWPC 600, 800, 900: Rp 1 1/2
(mm)
FWPC 400
FWPC 600, 800, 900
A
415
504
B
871
979
C
662
692
D
575
585
E
585
591
F
203
232
TECHNICAL SPECIFICATIONS
Primary circuit:
- Working temperature: 70/30°C
- Max. operating temperature: 110°C
- Max. operating pressure: 10 bar
Type preparer DHW
Number of plates
Outlet
Primary flow
Primary circuit manometric height available
Instantaneous DHW flow
Secondary circuit water resistance
Shipping weight
Secondary circuit (DHW):
- Working temperature: 10/60°C
- Max. operating temperature: 90°C
- Max. operating pressure: 10 bar
FWPC 213-100 223-200 429-300 449-400 637-450 849-550 961-650 997-750
13
23
29
49
37
49
61
97
kW
100
200
300
400
450
550
640
750
m3/h
2.2
4.2
6.7
8.0
10.2
12.1
14.1
15.1
kPa
38
7
13
5
40
29
10
7
m3/h
1.7
3.4
5.2
6.9
7.7
9.5
11.0
12.9
kPa
11
9
13
8
15
15
14
11
kg
184
195
209
230
239
253
263
293
PACKAGING
FWPC
Package No.
213-100
EC 667
223-200
EC 668
429-300
EC 669
449-400
EC 670
637-450
EC 671
849-550
EC 672
961-650
EC 673
997-750
EC 674
OPTIONS
3-way 2-position valve - Package EC 680
Allows you to manage the renewable energy
contribution on the FWPC. It is supplied with a dip
sensor and an attachable sensor.
3-way valve preheating sensor - Package EC 681
Can be used to replace the attachable sensor
supplied with package EC 680 in order to provide
a more accurate temperature for managing
reversal of the valve.
9
PLATE EXCHANGERS FOR INSTANTANEOUS DHW OF THE FWPS RANGE
DESCRIPTION – STRONG POINTS
The DHW calorifiers from the FWPS range consist of a
removable plate exchanger on a base with double modulated
primary pump (pump with energy efficiency index EEI < 0.23 ),
reactive 3-way mixing valve, and proactive regulation unit for a
constant and instantaneous DHW temperature regardless of the
flow rate (up to 5.5 m3/h at 60°C).
- Compact, robust and reliable product, mounted and wired
in the factory, supplied tested in accordance with the EU
directives 73/23EC and PED 97/23EC Article 3.3
- Unique primary flow rate control concept to ensure a low
return temperature (20°C) in order to maximise the renewable
energy contributions.
- Operation with a primary at 70°C to limit scaling in case
of very hard water and incorporates a reversal valve for
management of the renewable energy contribution
- «Plug & Run» control for autonomous proactive control of the
calorifier in instantaneous or semi-instantaneous mode. With
ECO and BOOSTER functions, alarm reporting, anti-clogging,
permutation of the pumps, thermostat, emergency and other
tests for simple use and self-adapting to the various installations
- ModBus RTU communication for cascading or remote access
with recording of the mode of operation.
MAIN DIMENSIONS
FWPS 200
FWPS 400
415
FWPS 200
1005
420
143
2
2
1
2
1
4
4
1535
1326
1535
92
2
92
1246
1224
FW_F0007A
3
240
97,5
3
203
140
500
530
818
839
335
662
92
240
97,5
FW_F0008A
880
880
140
335
203
500
575
700
779
Key
햲 Primary inlet:
- FWPS 200: Rp 1
- FWPS 400: Rp 1 1/4
햳 Primary outlet:
- FWPS 200: R 1
- FWPS 400: R 1 1/2
햴 Cold water inlet:
- FWPS 200: Rp 2
- FWPS 400: Rp 2
햵 DHW outlet:
- FWPS 200: Rp 2
- FWPS 400: Rp 2
TECHNICAL SPECIFICATIONS
Primary circuit:
- Working temperature: 70/20°C
- Max. operating temperature: 110°C
- Max. operating pressure: 10 bar
Type preparer DHW
Number of plates
Outlet
Primary flow
Primary circuit manometric height available
Instantaneous DHW flow
Secondary circuit water resistance
Shipping weight
Secondary circuit (DHW):
- Working temperature: 10/60°C
- Max. operating temperature: 90°C
- Max. operating pressure: 10 bar
FWPS
kW
m3/h
kPa
m3/h
kPa
kg
235-100
35
103
1.8
53
1.8
9
204
PACKAGING
FWPS
Package No.
235-100
EC 675
261-200
EC 676
497-300
EC 677
OPTIONS
3-way valve preheating sensor - Package EC 681
Can be used to replace the attachable sensor
supplied with the FWPS, in order to provide
a more accurate temperature to manage the
reversal valve.
10
261-200
61
191
3.4
19
3.3
13
229
497-300
97
317
5.6
19
5.5
8
271
PLATE EXCHANGERS FOR INSTANTANEOUS DHW OF THE FWP RANGE
DESCRIPTION – STRONG POINTS
The DHW calorifiers from the FWP range consist of a
removable plate exchanger on a base with double conventional
primary pump, 3-way primary mixing valve and regulation unit
ensuring a constant DHW temperature in instantaneous or semiinstantaneous mode, for flow rates up to 11 m3/h at 60°C
- Compact, robust and reliable product, mounted and wired
in the factory, supplied tested in accordance with the EU
directives 73/23EC and PED 97/23EC Article 3.3
- Classic plate exchanger concept for the replacement market
with primary temperatures above 70°C on boilers with constant
temperature and/or a hot-water loop
- Intelligent control for operation in instantaneous or semiinstantaneous mode. With ECO and BOOSTER functions, anticlogging, permutation of the pumps, thermostat, anti-legionella
treatment (temp. > 70 °C), and history
- Self-adapting to all conventional installations in the replacement
market.
Note: For major renovations we recommend our FWPC and
FWPS models, favouring energy savings.
MAIN DIMENSIONS
FWP 100
FWP 200 and 600
D
358
358
112
155
1
2
1
4
145
2
H
4
755
70
880
90
FW_F0009A
525
3
165
95
60
145
240
140
335
450
735
250
690
3
FW_F0012
1055
97,5
263
500
C
A
733
B
Key
햲 Primary inlet:
- FWP 100: Rp 1 1/4
- FWP 200: Rp 1 1/2
- FWP 600: flange DN 50
햳 Primary outlet:
- FWP 100: Rp 1 1/4
- FWP 200: Rp 1 1/2
- FWP 600: flange DN 50
햴 Cold water inlet:
- FWP 100: Rp 1 1/4
- FWP 200 and 600: Rp 2
햵 DHW outlet:
- FWP 100: Rp 1 1/4
- FWP 200 and 600: Rp 2
(mm)
FWP 2…
FWP 6…
H
1440
1462
A
480
543
B
910
1082
C
593
830
D
593
745
TECHNICAL SPECIFICATIONS
Primary circuit:
- Working temperature: 70/50°C
- Max. operating temperature: 110°C
- Max. operating pressure: 10 bar
Type preparer DHW
Number of plates
Outlet
Primary flow
Primary circuit manometric height available
Instantaneous DHW flow
Secondary circuit water resistance
Shipping weight
Secondary circuit (DHW):
- Working temperature: 10/60°C
- Max. operating temperature: 90°C
- Max. operating pressure: 10 bar
FWP 113-50 127-100 147-150 215-200 221-250 227-300 231-350 257-450 647-500 657-550 657H-650
13
27
47
15
21
27
31
57
47
57
57
kW
50
100
150
200
250
300
350
450
500
550
650
2.8
4.5
5.8
10.1
10.8
12.0
13.9
14.5
18.7
19.4
15.2
m3/h
kPa
6
13
13
25
32
27
9
12
9
6
20
0.9
1.7
2.6
3.4
4.3
5.2
6
7.7
8.6
9.5
11.2
m3/h
kPa
6
5
4
4
3
3
3
2
3
3
15
kg
84
88
94
215
220
225
227
234
270
279
279
PACKAGING
FWP
Package No.
113-50
EC 656
127-100 147-150 215-200 221-250 227-300 231-350 257-450 647-500 657-550 657H-650
EC 657
EC 658
EC 659
EC 660
EC 661
EC 662
EC 663
EC 664
EC 665
EC 666
OPTIONS
Insulation for plate exchangers:
- FWP 100: Package EC 678
- FWP 200 and 600: Package EC 679
11
DHW PERFORMANCES OF THE PLATE EXCHANGERS FWPC/FWPS/FWP
¹ FWPC: - with instantaneous DHW temperatures 10-60°C
FWPC
213-100
223-200
429-300
449-400
637-450
849-550
961-650
997-750
Primary Primary temperature 65°C Primary Primary temperature 70°C Primary Primary temperature 80°C Primary Primary temperature 90°C
flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop
m3/h
m3/h
m3/h
m3/h
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
2.2
100
29
11
2.9
163
47
19
3.3
227
65
37
4.2
200
57
9
4.7
267
77
16
4.4
328
94
23
6.7
300
86
13
7.0
413
118
23
7.1
508
146
35
8.0
400
115
8
8.0
507
145
12
8.0
613
176
18
10.2
450
129
15
10.5
595
171
29
12.5
845
242
58
12.1
550
158
15
13.8
788
226
29
13.8
971
278
44
14.1
640
183
14
14.5
860
246
22
14.5
1053
302
34
15.1
750
215
11
15.5
1000
287
14
15.6
1209
347
19
- with instantaneous DHW temperatures 10-55°C
FWPC
213-100
223-200
429-300
449-400
637-450
849-550
961-650
997-750
Primary Primary temperature 65°C Primary Primary temperature 70°C Primary Primary temperature 80°C Primary Primary temperature 90°C
flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop
m3/h
m3/h
m3/h
m3/h
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
3.1
120
38
13
3.3
150
48
20
3.1
200
64
30
3.1
240
76
51
4.7
183
58
9
4.4
219
70
13
4.4
282
90
21
4.4
335
107
30
6.9
280
89
13
6.9
335
107
17
6.9
430
137
31
7.1
525
167
46
8.0
356
113
8
8.0
420
134
11
8.0
530
169
16
7.9
620
197
22
12.0
449
143
21
12.2
545
174
30
12.5
725
231
53
12.5
875
279
77
13.2
530
169
16
13.5
645
205
24
13.6
835
266
40
13.7
1005
320
58
14.6
597
190
14
14.7
715
228
19
14.7
917
292
32
14.4
1095
349
45
15.6
702
224
8.3
15.5
830
264
11
15.6
1055
336
18
15.5
1225
390
24
¹ FWPS: - with instantaneous DHW temperatures 10-60°C
FWPS
235-100
261-200
497-300
Primary Primary temperature 65°C Primary Primary temperature 70°C Primary Primary temperature 80°C Primary Primary temperature 90°C
flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop
m3/h
m3/h
m3/h
m3/h
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
1.2
58
17
1
1.8
103
30
9
2.3
116
33
1
3.4
191
55
13
4.1
203
58
1
5.6
317
92
8
-
- with instantaneous DHW temperatures 10-55°C
FWPS
235-100
261-200
497-300
¹ FWP:
FWP
113-50
127-100
147-150
215-200
221-250
227-300
231-350
257-450
647-500
657-550
657H-650
Primary Primary temperature 65°C Primary Primary temperature 70°C Primary Primary temperature 80°C Primary Primary temperature 90°C
flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop
m3/h
m3/h
m3/h
m3/h
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
2.2
115
37
2
3.2
183
58
4
4.1
209
67
2
4.1
240
77
3
6.1
319
102
2
6.1
366
117
3
-
- with instantaneous DHW temperatures 10-60°C
Primary Primary temperature 65°C Primary Primary temperature 70°C Primary Primary temperature 80°C Primary Primary temperature 90°C
flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop
m3/h
m3/h
m3/h
m3/h
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
2.6
50
15
6
2.6
75
20
12
2.6
100
28
23
4.6
100
28
5
4.6
155
45
11
4.6
207
60
19
5.5
150
43
4
5.5
215
62
9
5.5
280
80
14
10.7
200
57
4
10.7
320
92
13
10.7
430
124
24
11.5
250
72
3
11.5
360
103
12
11.5
485
140
23
13.2
300
87
3
13.2
458
132
10
13.2
610
176
18
14.0
350
100
3
14.0
526
152
8
14.0
700
202
15
14.9
450
128
2
14.9
667
192
5
14.9
858
247
8
19.7
500
143
3
19.7
770
221
6
19.7
1010
289
11
20.5
550
158
3
20.5
835
239
5
20.5
1090
312
9
15.2
650
187
15
15.2
915
255
26
15.2
1120
320
40
- with instantaneous DHW temperatures 10-55°C
FWP
113-50
127-100
147-150
215-200
221-250
227-300
231-350
257-450
647-500
657-550
657H-650
12
Primary Primary temperature 65°C Primary Primary temperature 70°C Primary Primary temperature 80°C Primary Primary temperature 90°C
flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop flow Output DHW flow Sec. pressure drop
m3/h
m3/h
m3/h
m3/h
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
kW
L/min
kpa
2.6
42
13
5
2.6
58
19
10
2.6
83
26
20
2.6
108
35
29
4.6
93
30
5
4.6
123
39
9
4.6
175
56
17
4.6
220
70
26
5.5
130
42
4
5.5
175
56
8
5.5
245
78
13
5.5
308
99
21
10.7
175
55
5
10.7
250
80
10
10.7
363
116
21
10.7
468
149
34
11.5
201
63
5
11.5
282
90
10
11.5
408
130
20
11.5
525
167
32
13.2
263
83
4
13.2
365
116
8
13.2
514
164
16
13.2
654
208
25
14.0
310
98
4
14.0
421
134
6
14.0
591
188
13
14.0
747
238
21
14.9
419
133
2
14.9
532
170
4
14.9
729
232
7
14.9
910
290
11
19.7
470
150
3
19.7
618
197
5
19.7
860
274
9
19.7
1080
344
21
20.5
512
163
3
20.5
655
209
4
20.5
912
290
8
20.5
1130
360
13
15.2
635
200
16
15.2
765
244
22
15.2
965
305
22
15.2
1155
368
52
INSTANTANEOUS DHW CALORIFIERS FWS
DESCRIPTION – STRONG POINTS
Multi-zone steel calorifiers for production of instantaneous DHW,
to which all types of boiler can be connected and with the option
of connecting a solar circuit.
The main applications of this tank can be found in the service
sector: retirement homes, hospitals, schools, etc. where
prevention of legionella is essential. It is comprised of:
- a stratification storage tank
- an exchanger in the form of a high performance stainless steel
coil incorporated in the tank for the production of DHW:
• FWS 750: annealed stainless-steel tube, DN 32, with 1“
connection (7 bar),
• FWS 1500: 2 rigid, 1“ stainless-steel tubes individually
connected to the same circuit or to separate
circuits (10 bar).
MAIN DIMENSIONS (mm AND INCHES)
FWS 750
FWS 1500
Ø 950
Ø 1200
13
1
1
300
430
1
13
1
1
2
2
2
Ø 750
3
4
4
6
5
9
6
7
7
884
770
659
302
8
119
9
3
2160
3
270
9
6
6
1970
1277
1007
645
FWS_F0001
5
9
9
8
1080
150
4
395
4
7
7
9
7
8
8
292
180
FWS_F0002
3
611
1151
2190
Ø 1000
1945
2020
1482
2
35
12
Key
햲 Domestic hot water outlet
햳 Boiler inlet
햴 Boiler return (maxi solar)
햵 Solar circuit inlet
햶 Solar volume input
햷 Boiler return (mini solar)
FWS 750
Rp 1
R 1 1/4
R 1 1/4
R 3/4
R 3/4
R 1 1/4
FWS 1 500
R1
R 1 1/2
R 1 1/2
R 1 1/2
R 1 1/2
햸 Domestic cold water inlet
햹 Solar circuit outlet/drainage
Boiler outlet if no solar circuit
햺 Sensor tube Ø
햾 Thermometer
햿 Air vent
FWS 750
Rp 1
FWS 1 500
R1
R 1 1/4
R 1 1/2
20 mm
Rp 3/4
Rp 3/8
16 mm
R2
TECHNICAL SPECIFICATIONS
Operating pressure:
- tank: 6 bar
- DHW exchanger : FWS 750: 7 bar
FWS 1500: 10 bar
Model
FWS 750
Total storage volume
l
700
Total solar storage volume maxi/mini
l
380/230
DHW coil capacity
l
50
10 (single coil)
DHW exchange surface
m2
Exchange power maxi
kW
195
DHW coil pressure drop at
bar
0.2/0.8/2.0
2 m3/h / 4 m3/h / 6 m3/h
3
4
5
6
¼ DHW flow (with primary flow…) m3/h
Primary inlet temp.
°C 70 80 90 70 80 90 70 80 90 70 80
at temp.
outlet
Exchanged output
kW 143 186 - 171 - - 192 - - - DHW = 45°C Flow per hour at 'T = 35 K (1)
l/h 3513 4567 - 4216 - - 4729 - - - Primary inlet temp.
°C 70 80 90 70 80 90 70 80 90 70 80
at temp.
outlet
Exchanged output
kW 100 153 203 118 182 241 134 204 270 148 228
DHW = 60°C Flow per hour at 'T = 50 K (1)
l/h 1721 2629 3500 2043 3140 4143 2308 3518 4653 2554 3916
Cooling constant
Wh/24h.K.l
0.14
Net weight
kg
260
Max. operating temperature:
- tank: 95°C
FWS 1500
1440
860/700
86
11 (double coil)
280
0.1/0.5/1.0
90
90
-
3
4
5
6
70 80 90 70 80 90 70 80 90 70 80 90
170 201 - 196 239 - 211 262 - 223 274 4176 4938 - 4815 5872 - 5184 6437 - 5478 6731 70 80 90 70 80 90 70 80 90 70 80 90
117 179 220 139 203 261 154 217 288 160 227 301
2012 3078 3783 2390 3491 4488 2648 3732 4953 2772 3904 5176
0.15
320
(1) boiler connected in 햳 and 햹 (without solar)
13
INSTANTANEOUS DHW CALORIFIERS FWS
INSTALLATION WITH 2 FWS… CALORIFIERS CONNECTED IN PARALLEL
27
4
18
50
9
27
27
27
16
37
37
37
37
37
FWS_F0006A
37
17
Key: see page 15
The FWS connects to the boiler like a
calorifier with coil. The boiler reheats
the hot water storage volume, which
then provides heating of the DHW
exchanger for instantaneous DHW
production.
The DHW sensor circuit is placed in the
lower 1/3 of the FWS calorifier, for
which the set point should be adjusted
to 10 K above the desired DHW
temperature at the calorifier outlet.
The storage volume compensates for
low usage and for the revival time of
the boiler during the times of largest
demand. The choice of boiler power
should be made with respect to the 't
that it allows.
PRESSURE DROP ACCORDING TO THE DHW EXCHANGER FLOW
kPa
Comment :
The maximum permissible flow through the DHW exchanger on
the FWS 750 is 4800 l/h (80 l/min) because of the noise in the
exchanger.
Loss of pressure
200
180
160
FSW 750
140
*
FSW 1500
120
100
80
* 2 exchangers connected in parallel
40
20
0
0
10
20
30
40
50
60
70
80
90
100
110
Water
output
l/min
FWS_F0005
60
CONTINUOUS PERFORMANCE
FWS 750
y
ar
im t
pr tpu 3 /h
3
/h FWS 750
ou m
m
in
45 4
/h
Continuous performance
3
3
6
m
kW
5
45
60
m
/h
DHW flow per hour (l/h) at
6500
t
tle $C
ou in
60
tic re
es atu
m r
45
do pe
m
te
200
3
3m
/h
6000
5000
4500
80
60
r
ratu
3500
e
ry
ima
pr
100
mp
t te
inle °C
in
3000
1500
50
30
40
50
60
70
C330/630 ECO
(1)
3000
2500
2000
2500
2000
20
3500
4000
e
70
10
4000
5500
90
175
150
4500
6t primary
in (K)
1500
1000
FWS_F0007B
250
Example: GTU C 330 with
- DHW need: 3000 l/h
- Target DHW outlet temp.: 60°C ('T DHW: 50 K)
¹DHW setpoint temp. 70°C above primary inlet temp.: 80°C
Min. required boiler output: 175 kW. Primary flow rate required
to fill the tank: 3.8 m3/h, 'T primary: 40 K
¹Boiler selected: GTU C 337… with 193 kW
Recalculated primary flow with 'T primary of 40 K: 4.2 m3/h
Note: max. flow rate through the DHW exchanger: 4800 l/h
C230 ECO, MC..
GT..., DTG ...
FWS 1500
DHW flow per hour (l/h) at
Continuous performance
kW
FWS 1500
/h
6
m
p
o r im
in utpu ary
m3 t
/h
3
3
45
5
m
60
300
3
d
te om
m e
pe st
ra ic o
tu u
re tle
in t
$C
4
250
45
216
m
5500
6500
3
/h
6000
5500
200
80
4500
3000
2500
2000
1500
50
(1)
20
C230 ECO, MC..
GT..., DTG ...
14
30
37
40
50
4000
3700
3500
3000
100
C330/630 ECO
4500
5000
3500
prim
10
5000
4000
re
ratu
pe
m
t te
inle °C
ary in
70
8000
7000
3m
90
60
6000
7500
/h
60
150
8500
60
70
6t primary
in (K)
2500
2000
1500
1000
FWS_F0008A
/h
350
Example: C 330 ECO with
- DHW need: 3700 l/h
- Target DHW outlet temp.: 60°C ('T DHW: 50 K)
¹DHW setpoint temp. 60°C above primary inlet temp.: 80°C
Min. required boiler output: 216 kW
Primary flow rate required to fill the tank: 5 m3/h, 'T primary:
37 K
( 'T primary max. 25 K for C 330 ECO)
¹Boiler selected: C 330-280 ECO… with 280 kW
Recalculated primary flow with 'T primary of 25 K: 9.6 m3/h
(1) the max. primary 'T permitted on these boilers ensures that
they are protected against insufficient water supply.
PRIMARY STORAGE INSTANTANEOUS DOMESTIC HOT WATER TANKS PSE
DESCRIPTION
- Storage tanks in very thick sheet with interior coating in
rustproof paint
- The tank has multiple connection points
- Insulation in 100mm thick in mineral wool with external skin in
polystyrol
MAIN DIMENSIONS (mm AND INCHES)
ØK
ØL
100
A
45°
ØJ
B
,5°
22,5°
ØJ
22
ØJ
1
Ø··
G
H
F
D
PSE
500
750
1000
2000
3000
A
1950
1853
2206
2171
2172
C
Key
I
B
1557
1448
1801
1686
1607
FW_F0001A
E
햲 Sensor tube
C
790
630
730
910
790
D
340
350
350
400
480
E
990
830
930
1100
9990
F
290
300
300
350
430
G
1040
880
980
1160
1040
H
940
780
880
1060
940
I
390
400
400
450
530
ØJ
R 1 1/2
R 1 1/2
R2
R2
R 2 1/2
ØK
830
990
990
1300
1600
ØL
630
790
790
1100
1400
TECHNICAL SPECIFICATIONS
Max. operating pressure: 6 bar
Model
Capacity
Maintenance consumption at 't = 45 K
Shipping weight
Max. operating temperature: 95°C
PSE
L
kWh/24h
kg
500
500
3
115
750
750
3,5
160
1000
1000
3,8
195
2000
2000
5
330
3000
3000
6,5
536
PACKAGING
PSE
Package No.
500
EC 640
750
EC 641
1000
EC 643 + EC 644
2000
EC 645 + EC 647
3000
EC 649 + EC 650
Key for the installation diagrams
1
2
3
4
7
8
9
10
13
16
18
Heating flow
Heating return
Safety valve 3 bar
Pressure gauge
Automatic air vent
Manual air vent
Isolation valve
3-way mixing valve
Flush valve
Expansion vessel
System for filling the heating circuit
21
26
27
28
29
30
32
33
39
46
50
Outside sensor
Load pump
Non-return valve
Domestic cold water inlet
Pressure reducer
Sealed sanitary safety device calibrated to 7 bar
DHW loop back pump
DHW sensor
Injection pump
3-way 2-position directional valve
Disconnector
109 Thermostatic mixer valve
112a Solar collector sensor
112b Solar DHW tank sensor
124 Thermostatically controlled distribution valve
131 Collector field
132 Complete solar station with DIEMASOL control
system
133 Interactive remote control
166 Storage tank pump
15
INFORMATION ON THE PREVENTION OF SCALDING BY DOMESTIC HOT WATER AND THE DEVELOPMENT OF LEGIONELLA
To restrict the development of bacteria, the temperature of the hot
water distributed must be at least 60°C on leaving storage and,
if the installation includes a recirculation loop, the return water
temperature must be at least 50°C. In all cases, users must be
protected against the risk of scalding at the draw-off points where
the temperature of the water drawn off must not exceed 50°C.
RECOMMENDATION REGARDING SCALDING
Scalding caused by domestic hot water is a common accident
which has serious consequences, particularly because of its
potential extent. Around 15% of scalds are thought to be caused
by the domestic hot water temperature being to high, occurring
principally in the bathroom.
Room not intended for ablutions
Network
supply
point
Room intended for ablutions
KEY
T $C ) 60 $C
T $C ) 60 $C
T $C ) 50 $C
Draw-off point at
NO PARTICULAR RISK
from legionella
Draw-off point at
RISK
from legionella
Area subject to prescriptions
in the example
8980F229
Cold water
Domestic hot water
production
Source : excerpt from a draft DGS circular
RECOMMENDATION REGARDING LEGIONELLA IN STORAGE SYSTEMS AND DISTRIBUTION NETWORKS
Annex 1 : minimum duration of the daily increase in the water
temperature in storage equipment, excluding preheating
calorifiers
Minimum time for which the
temperature must be increased (min)
Water temperature (°C)
2
4
60
Higher than or equal to 70
65
60
temperature must be higher than or equal to 50°C at all points
in the distribution system with the exception of the final supply
pipes. The volume in these final supply pipes must be as low as
possible and at all times less than or equal to 3 litres ;
- When the total storage volume is higher than or equal to
400 litres, the water contained in the storage equipment,
excluding preheating calorifiers, must:
• Always be at a temperature higher than or equal to 55°C at
the equipment outlet ;
• Or be raised to a sufficient temperature at least once every
24 hours. Annex 1 gives the minimum water temperature
maintenance time to be respected.
Example 2 : storage tanks present in the distribution system
Network
supply
point
Cold water
Domestic hot water
production (without storage)
DE DIETRICH THERMIQUE
S.A.S. with corporate capital of 22 487 610 €
57, rue de la Gare - F – 67580 Mertzwiller
Tel. +33 3 88 80 27 00 - Fax +33 3 88 80 27 99
www.dedietrich-heating.com
8980F229
Legionella is caused by the inhalation of water spray
contaminated by legionella. Water temperature is a significant
factor in preventing the development of legionella in distribution
networks as the Legionella bacterium multiplies significantly in
water presenting temperature of between 25 and 43°C.
In order to limit the risk connected to the development of
legionella in domestic hot water distribution systems to which
draw-off points which may be at risk at likely to be connected,
the following requirements must be respected when using
domestic hot water production and distribution systems and
during the 24 hours proceeding their use :
- When the volume between the distribution point and the
most distant draw-off point is more than 3 litres, the water
Storage tank
T > 55 $C at the network
supply point or increased in
temperature on a daily basis
10/2014 – 300030548 – 347.555.559 Strasbourg Companies Register – Document not contractually binding - Printed in France - OTT Imprimeurs 67310 Wasselonne - 142735
Example 1
1 . In order to limit the risk of being scalded :
- in rooms intended for ablutions, the maximum temperature of
the domestic hot water is set at 50°C at the draw-off points ;
- in the other rooms, the maximum temperature of the
domestic hot water is limited to 60°C at the draw-off points ;
- in the kitchens and laundries of establishments open to the
public, the temperature of the water distributed may be
raised to a maximum of 90°C at certain points which are
indicated by special warning signs.