Checkout the diagram below
The water is pumped into the the cold inlet of the WSE47-20 using our FL30 pump ( this can also be your supply for pressurized cold water to your cabin) . The FL30 will run till the tank is full and float valve turns off. The FL30 then turns off when the pressure builds to approximately 25 psi. Note the WSE47-20 is designed as a low pressure system, so unit must be vented as per above picture.
If you are away from cabin for extended periods, the system will actually boil dry, so the vent should be a copper pipe
A second FL30 is connected to the hot water outlet. This pump pressurizes your hot water line so you have pressurized hot water at the turn of a tap.