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Hi I have a bypass valve fitted between the cyclinder coil and just before the motorized valve, can anyone tell me if this is to ... a, control the temp\flow through the coil inside the cylinder b, like a manual ABV - to keep flow consistent when TRVs are closed on rads c, a safety feature...

Thankyou - great example ! I wonder if the wall would be just as strong (or stronger) if it was curved towards the earth ?

changed pump - even though it looked fairly new and within 5 mins all radiators were piping hot ! Parker Central Heating Circulating (£49.95 on Amazon) !

Quick update: The expansion tank is filling up fine and the ball valve is not sticking. Last night I turned off all radiator valves and opened just the 2 problem ones and they got nice and hot, I then opened a couple more and they got hot, then a couple more and I had 6 toasty warm...

Thanks for the advise - very interesting. :wink: So basically I need to have a very slight overhang on each course to make it lean towards the earth and then back fill after 2-3 courses (to make sure I have access to backfill) ?

Thankyou, I haven't checked that yet so will have a look when I get home, there is only a single black plastic tank in the bathroom cupboard and no expansion tank (I have also checked the loft). The tank in the cupboard is not huge and there is not much clearance but I may be able to see...

Hi, I would like remove some banked earth in the garden and then I need to build a wall to hold back the earth but Im not sure how deep the footings need to be and whether I should go for single brick or breeze block construction? Also how long will I have to get the wall up before the...

Hi, I am having problems with 2 upstairs radiators not getting hot also the boiler is making a noise which sounds like a bird flapping around inside, I think this is what they call kettling ?. took problem rad off the wall and ran hosepipe through, replaced TRV with regular valve and re-hung...