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EXPANSION &
PUMP TANKS
n
Butyl diaphragm, for permanent separation
of air and water, with no waterlogging
n
In-line design, with
3
⁄4˝ NPTM Connection:
installs in cold water line of water heater
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Maximum Working Pressure 150 PSI
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Maximum Temperature: 140°F Residential
180°F Commercial
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IAPMO Approved
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5-Year Limited Warranty
TYPICAL EXPANSION TANK
INSTALLATION
WHY EXPANSION TANKS ARE IMPORTANT
Thermal expansion occurs when water is heated during non-use
periods. The installation of a Pressure Reducing Valve (PRV), Check
Valve or Back Flow Preventer ˝closes˝ the water system, leaving
water with no room for expansion. National Standard Plumbing
code: 10.5.7 requires backflow prevention, to prevent backflow into
the water main.
Thermal expansion in a closed plumbing system can be damaging,
dangerous and costly. Its effects include damage to water heater
connections, gas water heater flue tubes, pumps serving washers and
dishwashers, leaking faucets, ˝weeping˝ of water through the water
heater T&P Safety Valve, and noisy water hammer in the pipes.
A properly sized Expansion Tank eliminates these problems, by giving
water a place to go when thermal expansion occurs. When a water
heating cycle ends, or when any fixture is opened
within the system, the impact of thermal
expansion is reduced, and water drains out of the
expansion tank back into the system.
RELIANCE EXPANSION
TANK FEATURES
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Protection against
dangerous thermal
expansion in closed
systems
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Steel shell with
polyurethane coating
for maximum corrosion
resistance
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Drawn-steel tank with
2-coat bonded polymer
inner lining
Reliance Water Heaters
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Reliance Hotline: 1-800-365-4054
www.reliancewaterheaters.com
Expansion Tank Sizing Chart For Residential Water Heaters
Water Heater Capacity in Gallons
Inlet Water
Pressure* 30 40 50 66 82 100
40 PSI ETC-2X ETC-2X ETC-2X ETC-5X ETC-5X ETC-5X
50 PSI ETC-2X ETC-2X ETC-2X ETC-5X ETC-5X ETC-5X
60 PSI ETC-2X ETC-2X ETC-5X ETC-5X ETC-5X ETC-5X
70 PSI ETC-2X ETC-2X ETC-5X ETC-5X ETC-5X ETC-5X
80 PSI ETC-2X ETC-5X ETC-5X ETC-5X ETC-5X ETC-5X
*Highest recorded inlet water pressure in a 24-hour period of
regulated water pressure.
Water Heater Expansion Tanks
Maximum Acceptable Dimensions
Volume (Gallons) in Inches Shipping
Gallon Weight
Model Number Capacity 40 PSI 60 PSI A B (Lbs.)
ETC-2X 1.96 1.27 1.03 8
3
⁄8 12
1
⁄2 5
ETC-5X 4.55 3.05 2.19 11
3
⁄8 14
3
⁄4 8
ETC-10X 9.21 6.55 5.25 15
3
⁄8 15
3
⁄4 20
All models: 150 PSIG Maximum Working Pressure
© 2007 November 2007R RPMCP00107
Expansion tanks are pre-charged with a 40 PSI air charge. If the
inlet water pressure is higher than 40 PSI,the expansion tank’s air
pressure must be adjusted to match that pressure but must not be
higher than 80 PSI.
A
B
186750_RPMCP00107 11/6/07 9:02 AM Page 1