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thanks for the reply D_Hailsham now I think about it, silly thing to say :oops: it's just difficult raising the tank in the loft so trying to find other ways of increasing the head. May well be enough but I seem to be getting air in somewhere. Pump vertical and flowing downwards so...

thanks for the swift reply ChrisR all convectors and fairly small house so should only be about 3 litres needed then. Is it permissable to drop the cold feed pipe to the floor and then back up to increase the head? mazme

Can anyone tell me roughly the water volume of a typical c/h system with 7 rads. I know it wont be exact but an estimate wiould be useful. I understand there should be 3% of the sytem volume in the feed pipe to prevent air being drawn in. I have 2m of 22mm cold feed pipe from the tank to the...

do you mean choc block or white junction box (round about 3" diam) mazme