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To cold
water supply
Jacket access panel
Jacket access panel
Auxiliary catch
pan 2” (5.1 cm)
maximum
Drain valve
Electrical junction box (use
only copper conductors)
Hot water
outlet to xtures
6” ( 15.2 cm)
air gap
Shut-off valve
Union
Union
Thermal expansion
tank (if required)
To electrical
distribution panel
Relief valve
discharge line to
suitable open drain
Temperature and
pressure-relief valve
(shown in different
location for clarity)
PVC Tee
(Continued next page)
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PVC CEMENT
39&*OXH
The suggested method of controlling thermal expansion
is to install an expansion tank in the cold water line
between the water heater and the check valve. The
expansion tank is designed with an air cushion built
in that compresses as the system pressure increases,
thereby relieving the over-pressure condition and
eliminating the repeated operation of the relief valve.
Other methods of controlling thermal expansion are
also available. Contact your installing contractor, water
supplier or plumbing inspector for additional information
regarding this subject.