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allan williams · Joined: 03 Feb 2003 Posts: 2

hot water is permanently flowing through the vent into the feeder tank when the system is on. I have thought of two possibilities. First is the system being over-pumped, I have reduced the flow on the pump from 3 to 1. Will this damage anything. Secondly, could the pump be the wrong way round? It is fitted above the boiler with the arrow pointing down into the boiler. Could you comment please, I want to bring an end to the sauna in the loft

Ian · Moderator Joined: 18 Feb 2003 Posts: 32 Location: wigan

allan williams · Joined: 03 Feb 2003 Posts: 2

thanks for your help. turning down the pump has slowed the flow into the feeder. Hard to describe the location of the feeder tank without a diagram, but here's my best effort ! The feeder tank is opposite the cold water tank in the loft approx 2 metres away and below it by about 1 metre. The expansion pipe runs up the gable end and then follows the joists down to the feeder tank. At it's highest point the expansion pipe is approx 2 metres higher than the feeder tank but then falls at 45 degrees into the tank. Hope this makes sense

ChrisR · Posted: Sun Feb 23, 2003 12:38 pm Post subject:

Yes Allan it makes sense but unfortunately isn't the important bit!
The important factors are where in the system the Feed (usually 15mm pipe, from the header) joins the heating flow or return, and secondly the Vent (normally 22mm), joins the heating flow or return.
Is it a floor or wall boiler, & name/type please.

Best not to use "expansion pipe", cos most of the expansion goes up the feed pipe! Stick to feed and vent. The one you described is the vent.