2
Elson are a BDR Thermea company, and the UK’s leading manufacturer of hot water solutions utilising rectangular combination tanks and thermal store technology.
This expertise is now being recognised through our range of unvented hot water cylinders, the latest addition to our comprehensive portfolio of products.
Providing your customers’ hot water needs, the new Zircon cylinder range ensures the best possible performance – powerful mains pressure showering and fast filling baths, whilst delivering reliability and efficiency. Using the most advanced technology available, from Duplex stainless steel cylinder construction for maximum strength and corrosion resistance, CFC/HCFC-free injected foam to ensure best possible heat efficiency, primary coil and cold water controls design giving rapid reheat and good flow rate performance.
Backed by a 25 year guarantee with on-site service support.
Being part of one of Europe’s leading heating groups,
Elson offers you first class customer service; guaranteed specification advice on product selection and system type, a fully indemnified design service and installation support and guidance on how to get the optimum performance from your system.
* CheSS – Central heating system specifications.

The Elson cylinder range is constructed from strong and lightweight Duplex stainless steel to allow ease of handling on site, whilst offering exceptional corrosion resistance particularly in aggressive water areas, compared with some forms of stainless steel and glass-lined steel. With no sacrificial anode to replace regular maintenance is kept to a minimum.
Every Elson cylinder is tested to 15 bar in its manufacturing plant, giving flexibility whether in a domestic or commercial application.
Foam insulation measuring 50mm (CFC/HCFC-free – ODP zero) is available on all models to give improved insulation standards. Our cylinders are finished in modern and robust white plastic-coated corrosion-proofed steel, cased with grey high impact thermoplastic top and bottom mouldings.
Indirect models are designed to offer high output coil-in-coil heat exchangers rating from 12.5 to 19kW allowing high efficient transfer of energy whilst its position in the base of the cylinder maximises the amount of hot water heated, and the cold water controls design delivers good flow rate performance. The Elson cylinder range gives mains pressure hot water for a balanced supply to showers and mixers – without the need for a shower pump.
Designed with the installer in mind – all plumbing and electrical connections are located easily to give maximum access. Plumbing connections are 22mm compression.
Capacities range from 120 to 300 litres on the standard models and 190 to 300 litres on the solar models. With no cold feed cistern required – the cylinder can be installed in an airing cupboard, loft, cellar, utility room or even in a garage.
25 YEAR GUARANTEE MADE IN THE UK
3

Model
Part code
120zi 150zi 170zi 210zi 250zi 300zi
93:050:001 93:050:002 93:050:003 93:050:004 93:050:005 93:050:006
Model
Part code
120zd 150zd 170zd 210zd 250zd 300zd
93:050:011 93:050:012 93:050:013 93:050:014 93:050:015 93:050:016
4
Ø550 Ø550
A
315 354
B
20°
25°
30°
45°
81
595
A
306
B
81
595
30°
45°
Model 120zi 150zi 170zi 210zi 250zi 300zi
Capacity (litres) 120 150 170 210 250 300
Dimension (mm)
A
B
Element rating
(kW)
930 1114 1240 1498 1752 2067
615 800 925 1184 1378 1693
1x 3 1x 3 1x 3 1x 3 1x 3 1x 3
Weight (kg)
Empty
Full
27 32 34 40 44 52
147 182 204 250 294 352
Standing heat loss per day
(kWh/24h) 1.47 1.70 1.92 2.10 2.22 2.52
Model 120zd 150zd 170zd 210zd 250zd 300zd
Capacity (litres) 120 150 170 210 250 300
Dimension (mm)
A
B
Element rating
(kW)
930 1114 1240 1498 1752 2067
2x 3 2x 3 2x 3 2x 3 2x 3
1693
2x 3
Weight (kg)
Empty
Full
24 28 31 37 39 49
144 178 201 247 289 349
Standing heat loss per day
(kWh/24h) 1.47 1.70 1.92 2.10 2.22 2.52
Specifier Advice Line 0844 335 8819 specifier@elsonhotwater.co.uk

Indirect
Using primary heating coil
Model 120zi 150zi 170zi 210zi 250zi 300zi
Primary Flow (l/min) 15 15 15 15 15 15
Heat Up Time (mins) 29 37 35 43 43 49
Hot Water Capacity
(volume of water >40°C) 104 138.5 156.5 196 227 242.5
Capacity Available as
Hot Water (%) 87 92 92 93 91 81
Coil Output (kW) 12.5 12.5 15.0 15.0 18.0 19.0
Direct
Using element only
Model 120zd 150zd 170zd 210zd 250zd 300zd
Heat Up Time (mins)
Capacity Available as
Hot Water (%)
121 152 173 215 257 310
Hot Water Capacity
(volume of water >40°C) 104 138.5 156.5 196 227 242.5
87 92 92 93 91 81
Model 190zsi 210zsi 250zsi 300zsi
Part code 93:050:007 93:050:008 93:050:009 93:050:010
A C D B
Ø550
Solar indirect
Using primary heating coil
Model
Primary Flow (l/min)
Heat Up Time (mins)
Hot Water Capacity
(volume of water >40°C)
Capacity Available as
Hot Water (%)
Auxiliary Coil Output (kW)
Auxiliary Volume (litres)
Solar Coil Output (kW)
Solar Volume (litres)
190zsi 210zsi 250zsi 300zsi
15 15 15 15
32 25 30 32
177 196 237 265
93 93 95 88
11.9 15.2 15.2 17.4
120 120 145 175
19.0 19.0 19.0 19.0
65 85 95 120
595
Performance notes
Indirect cylinders tested in conformance with BS EN 12897:2006.
Coil performance in kW, calculated as per A.5.2 in conformance with BS EN 12897:2006.
Heat up time from cold through 45°C, with a primary flow rate 15 l/min at 80°C ± 2°C.
Hot water capacity using a domestic flow rate:
120 to 250 litre volume, flow rate of 15 l/min.
251 to 300 litre volume, flow rate of 30 l/min.
Calculated as per A.4.1 in conformance with BS EN 12897:2006.
Direct heating times assume use of lower element only, from cold, through 45°C.
81
373 415
20°
25°
30°
45°
Model 190zsi 210zsi 250zsi 300zsi
Capacity (litres) 190 210 250 300
Dimension (mm)
A
B
C
D
1398 1499 1751 2065
1019 1184 1391 1715
734 1011 1142 1439
925 1095 1258 1574
Element rating (kW) 1x 3 1x 3 1x 3 1x 3
Weight (kg)
Empty
Full
43 50 51 58
233 260 301 358
Standing heat loss per day (kWh/24h) 1.65 1.75 1.98 2.33
Selection guide
Application
Bedsit
1 bedroom, 1 bath & shower
2 bedroom, 1 bath & shower
3 bedroom, 1 bath & shower
4 bedroom, 1 bath & shower
4/5 bedroom, 2 bath & shower
4/5 bedroom, 3 bath & shower
Light commercial use
Indirect Direct Solar Indirect
120zi 120zd 190zsi
120zi 150zd 190zsi
120zi 170zd 210zsi
150zi 210zd 250zsi
170zi 210zd 300zsi
210zi 250zd 300zsi
250zi 300zd 300zsi
300zi 300zd 300zsi
Sizing in accordance with BS6700.
This selection chart is for guidance only.
Hot water requirements will vary dependent on bath size and usage patterns.
Please contact the Specification Advice Team for further advice.
Specifier Advice Line 0844 335 8819 specifier@elsonhotwater.co.uk
5

6
Nominal Capacities
Indirect models: 120, 150, 170, 210, 250 and 300 litres.
Direct models: 120, 150, 170, 210, 250 and 300 litres.
Solar Indirect models: 190, 210, 250 and 300 litres.
Element
Long-life Incoloy 825 sheathed element, incorporated into an easily-removable heater plate, should replacement be necessary. Rated 3.0kW @ 240V.
Outer Casing
White plastic-coated corrosion-proofed steel with grey high impact thermoplastic moulded top and bottom covers.
Thermal Insulation
CFC/HCFC-free (ODP ZERO) fire retardant expanded polyurethane.
50mm thickness. GWP 3.1 (Global Warming Potential).
Inner Container
Duplex stainless steel, pressure tested to 15 bar.
Primary Coil
22mm diameter stainless steel. Coil-in-coil design for improved performance. Rated to 10 bar.
Purpose designed solar coil 1.1m
2 .
Thermostat
Capillary type thermostat & thermal cut-out on all models.
Direct Models:
Element thermostat adjustable 12°C to 68°C. Manual resettable thermal cut-out, set to 85°C.
Indirect Models:
Primary thermostat adjustable 12°C to 68°C. Manual resettable thermal cut-out, set to 85°C.
Solar Models:
Manual resettable thermal cut-out, set to 85°C.
Safety Features
Temperature and pressure relief valve, factory-set to operate at 10 bar, 90°C-95°C.
Anode
None required.
Approvals
BEAB and Nemko approved. Kiwa approved to the UK Water Supply Regulations.
Kiwa approved for Building Regulation G3. CE marked.
Manufactured in the UK in an ISO 9001:2008 and ISO 14001:2004 registered factory.
All indirect units – in compliance with BS EN 12897:2006.
Guarantee
On-site service support including parts and labour for 12 months from date of installation.
After the initial 12 months, a guarantee will apply for a further 24 years for the stainless steel inner vessel only. During this 24 year period, in the event of a cylinder leak, a replacement product will be issued provided that the replacement is carried out by one of our heateam engineers, for which reasonable labour charges will apply.
The guarantee is valid provided that:
• It has been correctly installed as per the instructions contained in the instruction manual and all relevant Codes of Practice and Regulations in force at the time of installation.
• The Benchmark Checklist has been completed upon commissioning and the Benchmark
Service Record is completed for each service.
• It has not been modified in any way, other than by Elson.
• It has not been frost damaged.
• It has only been used for the storage of potable water.
• It has not been tampered with or been subjected to misuse or neglect.
• The fault is not scale related.
• Within 60 days of installation the user completes and returns the certificate supplied along with the proof of purchase to register the product.
• It has been installed in the United Kingdom.
• The fault is not caused by high chloride levels in the water supply or incorrect disinfection methods. Maximum permissible chloride level 250mg/l (PPM).
• The expansion vessel and cold water controls are guaranteed for a period of 5 years from the date of purchase.
Evidence of purchase and date of supply may be required. The guarantee is transferable.
This guarantee does not affect your statutory rights.
Unvented units over 15 litre capacity must be installed by a competent installer in accordance with Local Regulations: England & Wales – Building Regulation G3.
Scotland – Technical Standards P3. N. Ireland – Building Regulation P5.
Fixing
Feet on bottom moulding for floor mounting.
Plumbing Connections
Inlet / Outlet – 22mm compression fittings / ¾" BSP parallel thread.
Fittings
Compression nuts and olives included.
Indirect Coil
22mm compression fittings / ¾" BSP parallel thread.
Temperature and Pressure Relief Valve
15mm compression outlet.
Cold Water Control
Integrated cold water control set comprising pressure reducing valve and strainer
– factory set at 3.5 bar. Expansion relief valve – factory set at 6 bar and check valve.
22mm compression fittings. A 2-port motorised valve is supplied with Indirect models.
Flow Rates
Up to 55 l/min @ 6 bar pressure.
Operating Pressure
3.5 bar.
Expansion Relief Valve Pressure
6.0 bar.
Operating Temperature
Recommended 60°C.
Adjustable from 12°C to 68°C.
Water Expansion
Remote expansion vessel – 12 litre vessel supplied with 120 and 150 litre models.
18 litre vessel supplied with 170 and 210 litre models. 25 litre vessel supplied with 250 and 300 litre models. Solar indirect remote expansion vessel – 18 litre supplied with 190 and 210 models; 25 litre supplied with 250 and 300 litre models. The expansion vessel is pre-charged to 3.5 bar.
Minimum Water Supply Requirements
Recommended minimum supply pressure – 1.5 bar/20 l/min flow rate. If there are any doubts about water supply pressure or flow rates, please contact our Specification Advice
Team to discuss.
Secondary Circulation
Via 22 x 22 x 15mm swept tee, which should be fitted to the inlet pipework.
Secondary circulation is NOT recommended for direct electric units being used on off-peak electricity tariffs.
Pressure Testing
Units are tested to 15 bar.
Compatible Boilers
Electric, gas or oil fired – open vent or sealed system type, fitted with integral control thermostat and cut-out. A pumped supply to the primary coil is required.
Tundish
15mm compression inlet and 22mm compression outlet.
Direct Models:
Connection is to the combined thermostat/thermal cut-out, housed within the integrated controls housing. The electrical supply must be permanently connected via a double pole linked isolating switch with a minimum break capacity of 13A.
Indirect Models:
Controls should be wired to the boiler, programmer etc. in accordance with the control scheme being used.
All electrical wiring must conform to the latest IEE Wiring Regulations.
25 YEAR GUARANTEE MADE IN THE UK
Specifier Advice Line 0844 335 8819 specifier@elsonhotwater.co.uk

CWS
P
AGD
AGD
250 and 300 models only
AAV
AGD
CWS
Gas
AGD
S
AAV
AGD
CWS
P
S
Gas
S
AGD
Pump
Single Check Valve
Lock Shield Valve
Drain Cock
Flow Setter
Automatic Bypass Valve
Thermostatic Radiator Valve
Radiator Lock Shield Valve
P
Combined Isolation & Check
Valve with Thermometer
Pressure Gauge Assembly
Double Check Valve Strainer Safety Valve
Filling Loop
Thermostatic Mixing Valve Double Reg. Valve T & P Valve
Flexible Connection Air Separator
Pressure Reducing Valve
Isolation Valve
Angle pattern Drain Cock
Expansion Vessel
AAV
Automatic Air Vent
Flow Meter Tundish
2 Port Motorised Valve Stop Cock S
Temperature Sensor
The hydraulic schematics within this document are for guidance only and do not constitute system design. Some components may not be detailed for clarity purposes.
Specifier Advice Line 0844 335 8819 specifier@elsonhotwater.co.uk
Aqua
AGD
Aqua Stat
Room Stat
Programmer
Anti-Gravity Dip
Safety Discharge Vessel
Immersion Heater
7

Elson is one of the UK’s leading providers of packaged Hot Water and Heating solutions. Our standard and tailor-made pre-plumbed packages from
BDR Thermea’s portfolio, provides house-builders, developers and specifiers with compact easy to install complete heating and hot water systems. Assembled at our factory and arriving on site, all systems are installation ready, giving an aesthetically pleasing, well-designed consistent system which takes up the minimum amount of space.
Why Choose Elson Off-Site?
• Technical design team
• Engineer site visits
• Reduction in site traffic
• All parts included
• Complementary technology
• Guaranteed integrity and system performance
• One supplier – better logistics
• Maintenance costs reduced – whole system servicing
• Shorter time spent on site
• Predictable completion dates – not weather dependent
• Cost certainty
• Reduced risk of theft and damage
• Improves cashflow
• Consistently achieved quality in a factory controlled environment
• Reduces health and safety risks on site
• Less waste, less packaging
• Less storage space required
Packaged solutions have become increasingly more popular as demands for savings in the time spent on site, labour costs and on-site waste have increased.
The constant need to control quality, monitor specification compliance and guarantee system performance, has also increased the demand for off-site fabrication. Our packages are supplied in modular format on robust frames, so when on site every installation is standardised and easy to connect to the system. Furthermore, every package is designed to ensure that access to all components, for on-going maintenance, is straightforward and convenient.
Packages can comprise of:
• Thermal stores
• Boilers
• District heating interface units
• Unvented cylinders
• mCHP
• Underfloor heating manifolds and controls
• Heat and water metering
• Electrical distribution boards
• Telephone and broadband communications
• Space and services for a washing machine
• Heating control interfaces
• Solar and ground thermal water heating
• Air source heat pumps
• First fix rails
The choice is yours – the possibilities are endless!
heateam is Elson’s very own service division. With us on your side, you can be sure that your customers are in the very best hands. Totally committed to quality and safety, heateam is open 7 days a week, for 363 days a year, and offers:
• Dedicated Trade Advice Line
Our helpful and qualified specialists are always on hand to help you with even the most complex technical query.
• Installer Priority Call-Outs
Our 280 strong team of specifically trained expert heating engineers covers the UK, no one is better qualified to look after Elson’s products for the duration of the guarantee.
• Fully Stocked Vans
A nationwide fleet of vans, fully stocked with spare parts – meaning we can repair our appliances on the first visit in 95% of call-outs.
• Exclusive Service Plans
Heateam also offer Elson’s customers a range of exclusive annual service plans.
Opening Times: Monday-Friday 8am-6pm, weekends and Bank Holidays* 8.30am-2pm.
Simply call 0844 8711535 or visit our website at www.heateam.co.uk
*Excluding Christmas Day and New Year’s Day.
As part of the BDR Thermea group, interpart is one of the largest parts distribution businesses of its kind in the UK; handling the spares, accessories and consumables for a wide range of brands and meeting the expectations of its customers through a firm commitment to quality.
interpart has developed the skills and experience in supply chain management, to get the part from the point that it is manufactured, direct to the engineer who fits it onto the appliance in the home of the end user. Giving the customer the right part, at the right time, first time, every time is achieved through interpart’s extensive skills that have been developed across many areas of expertise.
Amos Ayre Place, Simonside, South Shelds, Tyne & Wear NE34 9PE
T: 0844 335 8819
F: 0844 871 1528
E: info@elsonhotwater.co.uk
W: elsonhotwater.co.uk
The pace of product development is such that we reserve the right to change product specifications without notice.
We do, however, strive to ensure that all information in this catalogue is accurate at the time of publication.
Part no.
93 900 024 Issue 1 June 2011