I'm baffled. Maybe someone here can figure this out.
A few weeks ago, I replaced the leaking overpressure/overtemperature valve
on our old Raritan water heater, and ever since, the pressure water pump
acts very oddly. It starts out sounding normal, then as the pressure builds
it is obviously working harder and slower, until finally it stops. When I
open the hot water tap, the water runs for quite a while before the pump
kicks in, whereas it used to come on almost instantaneously. In addition,
when I open the taps after motoring, the cold water tap is providing very
hot water for the first 10-15 seconds.
Yesterday I tried running the system dry then refilling the tank but it
didn't seem to help. My best guess is that there is an air bubble in the
tank somehow and the pump is compressing the air, so it takes longer to
reach pressure and then the pressure bleeds off while the tap is open.
Any bright ideas on how I might fix this?

Jim Watts
Paradigm Shift
C&C 35 Mk III
Victoria, BC
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