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Even though the relief valve operates during each
recovery period, high internal pressures occurring over
and over again can accelerate tank leakage and short-
en water-heater life, no matter how it is fired.
Controlled Pressure Rise
During Thermal Expansion
The best solution to thermal expansion is to control
the pressure it generates within a safe operating
range, well below the emergency setting of a relief
valve. This allows thermal expansion to occur without
causing a dangerous increase in pressure.
150 PSIG
SAFE
RANGE
Solution