Hi all,
I have a Bristan shower (Pisa, if that's relevant) and it's gone on the blink. Just what I need for Christmas. I have an open vented system, with dedicated draw off for the shower. This is then boosted by a twin impeller pump before feeding the shower (pump is from Wickes). System has been up and running for about 5 years.
Symptoms are - no hot water out of the shower. You can get hot water out of other taps, and you can feel the pipes are hot either side of the pump (so to me, this rules out just convected heat). The pump makes an un-happy whining sound, but is definately running because of the pressure that comes out of the shower. If you turn off the pump, you can then get a hot shower, but of course without the pressure.
It has happened very intermittently in the past, and flicking the bath tap on seems to draw water through and the shower hots up. This time it's not fixing the issue, and the missus doesn't like a cold shower. Neither do I, for that matter. But then I tried it again in the evening and it's worked OK (with the pump).
My thoughts are - air in the pipe (but how does the air get there?) and I'm not convinced. Pump not working - but you can hear it and the pipes are warm both sides (which also seems to go against the air lock). Shower knackered (but it's an intermittent fault, and works OK with no pump running). You can apparently replace the shower cartridge (If I can get the old one out) - I'll give it a clean. My only other thought - maybe it can't handle the pressure with the pump? I'll check out the specs for this.
Any thoughts or advice, gratefully received!!
DavidL