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Old 09-06-2019, 05:40 AM   #11
FF
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Join Date: Oct 2007
Posts: 22,553
"I don't bother with an accumulator."

The accumulator serves 3 purposes.

One is to be a place for the water in the water heater to expand so it does not raise the system pressure to require the T&P valve to release pressure.

Second it is to absorb the higher pressure that comes from the pumps momentum after it is cycled off by the pressure switch.

It also if large enough can provide water with out switching the pump on , which at low flows will short cycle the pump and pressure sensor.

All DC pumps are harder on the contacts in the pressure sensor than AC pumps.
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