Domestic hot water pressure

[mbulriss]

Sounds like there is definitely air in the lines somewhere. A leak
some where? An air pocket?

The only water mixer valves are the faucets themselves. No check
valves in the water lines after the pump that I remember either.

Here's what I experienced last year. When I changed out my shower
valve, I shut the pump off, drained the sink faucets to relieve
pressure, and removed the valve. When I got back from the store and
inserted the new mixer valve and turned the pump on, I got cold, but
no hot. Neither on pump or shore water. Got water at the sinks
though! Ended up purging all the system lines by opening the outside
faucet (low point) and then opening each sink and then the shower.
Very quickly got hot water again at the shower. Shut all faucets off,
no problems since then. Seems to me that I created an air pocket when
I purged the system lines and it cleared when I opened all valves in
sequence. Seems weird, but it worked for me. If you haven't worked
on plumbing, I suspect a leak somewhere introducing air into the system.

FWIW,

Mike Bulriss
1991 WB40 "Texas Minivan"
San Antonio, TX

--- In WanderlodgeForum@yahoogroups.com, "Gregory OConnor"
wrote:
>
> Maybe it is air in the HWtank but then you would get air out of the
> faucet??? unless you have a pressure blatter tank?
> GregoryO'Connor
> 94ptRomolandca
>
> --- In WanderlodgeForum@yahoogroups.com, "pattypape"
> wrote:
> >
> > We occasionally lose hot water pressure at all faucets,
> > The cold water lines retain pressure.
> > This occurs when on City water hook-up or on Fresh water tank pump.
> > This is intermittent and eventually hot water pressure returns.
> >
> > Is there a check valve in the hot water line???
> > Or is there a hot water mixing fitting to help lower the very hot
> water
> > temperature created, when on coolant motor-aid hot water???
> >
> > Any suggestions are welcome.
> >
> > Bill 88 FC Michigan
> >
>