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Posted By: Ed DaviesWhen the bath tap is fully open the pressure at the top of the conventional cylinder will drop quite a bit. The pressure at the top of the solar cylinder will drop by roughly half that amount.
Posted By: SteamyTeaDon't you just want a non return valve
Posted By: Ed DaviesThis is getting awfully complicated and Heath-Robinson
Posted By: SteamyTeaYes, all that is valid, but aren't these things designed to fail in a safe manner. Just a flap with asymmetric springs after all.
Posted By: ringiThis is yet another thread that reinforces my view that thermal solar water heating is not worth it in the UK! (Unless you use a LOT more hot water summer that most people do, e.g. large B&B)
Posted By: djhThis is a PV system, not a solar thermal one, I believe.
Posted By: ringihis is not advice, get it checked by a qualified person (with insurance cover) as I am not paying to rebuild your home if it goes wrong!
Posted By: ringiPosted By: djhThis is a PV system, not a solar thermal one, I believe.Then way is there two tanks, and a pump fixed to the solar tank..... (I think the confusion comes from the pump running from a small PV panel.)
Posted By: jamesingramIt's heated by a pv immersion dump
See drawing , vented as shown. Ignore thermal bit.
Posted By: ringiWhy not put both cylinders next to each other at the same height?
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