Thor Forums

[16ACE27]

Tankless heaters are finicky and require a minimum FLOW, not water pressure to operate. But you do need to have that pressure to supply the flow.

The water pump in your RV has a pressure switch integrated into it. It allows the pump to cycle off at the high pressure setpoint when you have the wall switch ON. Then, when you open a faucet, the water header pressure drops as the water flows, and when it reaches the pressure switch's low setpoint, the pump will turn back on to supply water flow.

If the pump's flow is greater than the faucet's demand, the pump will cycle off when the high setpoint is reached, then cycle back on when the low setpoint is reached, and continue to do this until you shut the faucet off.

The pump's pressure switch switch does have an adjustment so you may need to look at adjusting the setpoints.