TANKLESS WATER HEATING TECHNOLOGY
For Commercial Applications
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Why tankless water heaters?
Building a case for tankless:
The key factors that are important:
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Energy Efficiency
Unlimited Hot Water
Cost – Capital & Operating
Commercial vs. Residential
ROI
Sizing & Piping
Redundancy
Code Alert
Modulation
Lifespan
Warranty
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Rinnai’s Global Presence
•
Based in Nagoya, Japan
•
Established in 1920
•
7000 employees worldwide
•
Operates in over 43 countries
RINNAI’S GLOBAL PRESENCE
RINNAI GLOBAL HEADQUARTERS
•
Worldwide Leader
•
2010 turnover: $3+ Billion
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Rinnai North America
North American Headquarters:
Peachtree City, GA
•
Over 200 direct employees &
representatives
RINNAI AMERICA HEADQUARTERS
•
Rinnai NA has its own CSA
certified testing laboratory
www.rinnai.us • © 2011 Rinnai America Corporation • engineering@rinnai.us
Rinnai North America Products
Rinnai America’s Heating Solutions
Non-Condensing
Tankless Water Heaters
Hydronic Furnaces
Condensing Tankless
Water Heaters
Condensing
Hydronic Boilers
EnergySaver® Direct Vent
Furnaces
Commercial
Cooking products
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Basic Requirements
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Gas Delivery pressures range from:
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8” wc – 13.5” wc for propane
Water pressures requirements:
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5” wc – 10.5” wc for natural gas
20 psig – 150 psig (50 psi
recommended)
Hot & Cold water supply lines to be
minimum ¾” piping.
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Sequence of Operation
Incoming Air
1. Water flow begins
Exhaust
Secondary Heat
Exchanger
Primary Heat
Exchanger
2. Ignition Sequence
Heat
Exchanger
Thermistor
3. Normal Operation
Burner
Sensor
FR 2
Igniter
4. Shut-down Sequence
FR 1
5. Standby Mode
Condensate Trap
SV2
SV1
SV4
Combustion Fan
Modulating
Gas Valve/POV
PCB / Surge Protector
SV3
Bypass
Out going
Temperature
Thermistor
Water Flow
Sensor
SV0 or SV Main
Water flow
control valve
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Types of Applications
RESIDENTIAL
APARTMENTS/CONDOS
HOUSING AUTHORITES
FOODSERVICE
HOSPITALITY
HEALTHCARE
SCHOOLS
GOVERNMENT / MILITARY
CAR WASH
LAUNDROMATS
HAIR SALONS
FITNESS CENTERS
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THE BASICS
Four important factors when sizing tankless units:
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Incoming ground water temperature
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Hot water demand
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Altitude
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Gas line size
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Understanding Maximum Flow Rate
EXAMPLE (from previous page)
Incoming water = 57°
Rinnai Set-Point temperature = 120°
Subtract the incoming ground water temperature from the water heater’s set temperature for ∆T 120° - 57° = 63
The maximum GPM flow rate for any given ∆T can be found at the intersecting points along each model’s
specific flow curve
A GPM flow test from the temperature controller can verify each unit’s performance
Flow curves
of each
model are
listed in
each
installation
manual
Water Flow (gpm)
RC98i/e
Flow Curve
If incoming water is 57° and
requested temperature is 120°, ∆T is
63° and gpm flow rate is 6.0 gpm
63
∆T Temperature Rise (°F)
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RC Series Maximum Flow Curves
Models
RC98
RC80
Max. Btu 199,000 157,000
T(°F)
GPM
GPM
140
135
130
125
120
115
110
105
100
95
90
85
80
75
70
65
60
55
50
45
40
≤35
2.7
2.8
2.9
3.0
3.2
3.3
3.4
3.6
3.8
4.0
4.2
4.4
4.7
5.0
5.4
5.8
6.3
6.9
7.6
8.4
9.5
9.8
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
3.0
3.1
3.3
3.5
3.7
4.0
4.3
4.6
5.0
5.4
6.0
6.6
7.5
8.0
RC98i/e
RC80i/e
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SIZING METHODS – Definitions
Four methods used to sized tankless units:
FLOW RATE (GPM)
GPH REQUIREMENTS (GPH)
WATER SUPPLY FIXTURE UNITS (WSFU)
TANK WATER HEATER REPLACEMENTS
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PIPING DESIGN LAYOUT
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Hydronic Furnace
Matched Component System
Easy, Flexible Installation
Evaporator
Coil
Comfortable Hydronic Heat
Heat Your Air as Efficiently as Your Water
.
Domestic Hot Water Priority System
` `
Gas Supply
Cold Water
Supply
`
Domestic
Hot Water
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`
Mixing Valve
Rinnai Concentric Venting
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Vent Termination Requirements
12” (30 cm)
between
Rinnai
terminals at
the same level
36” (.91 m) to
ventilated or
unventilated
soffit or eve
vent; or to a
deck or porch*
60” (1.52m)
between Rinnai
terminals at
different levels
12” (.30 m) to an
inside corner*
12” (30 cm)
between Rinnai
terminals at the
same level
2 inches
between
outdoor
units at the
same level
60” (1.52m)
vertically between
Rinnai terminals
(Also applies to
HPe models)
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16
Why choose a Rinnai Tankless?
Rinnai offers the most comprehensive warranty:
www.rinnai.us • © 2011 Rinnai America Corporation • engineering@rinnai.us
Application Example
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Sizing Report
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Sizing Report
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Application Example
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Application Example
EXISITING EQUIPMENT:
2 - PVI boilers (model: 800P 250A-PV) operating at 120°-125° for
their domestic hot water to the rooms
1 - Bradford White tank (model: EF100T150E3N2) zoned for the
kitchen / laundry demand operating at 175°-185°.
www.rinnai.us • © 2011 Rinnai America Corporation • engineering@rinnai.us
Application Example
CAPITAL COST:
Replace existing PVI / Bradford White System:
Replace with Rinnai System:
Savings if using Rinnai System:
$88,500
$45,356
$43,144
ESTIMATED CAPITAL & OPERATING SAVINGS WITH RINNAI: YEAR 1
Equipment saving:
$43,144
Energy savings:
$10,446
TOTAL SAVINGS
$53,590
www.rinnai.us • © 2011 Rinnai America Corporation • engineering@rinnai.us
CONTACT INFORMATION
CAN WE HELP PROVIDE YOU A RINNAI SOLUTION
FOR YOUR NEXT PROJECT?
Rinnai will size your project and provide you a Commercial
Sizing Report with Piping Diagram back to you within 48
hours and Free of charge. Please contact us at:.
Rinnai Corporation
1-800-621-9419 ext. 6
engineering@rinnai.us
103 International Drive
Peachtree City, GA 30269
www.rinnai.us • © 2011 Rinnai America Corporation • engineering@rinnai.us