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should a 15/60 grundfoss pump be able to run 9 rads spread over 3 floors if it is positioned at the highest point (i.e loft) assuming everthing else is working fine. Has it got enough flow and power to get hot water in the heating down a good 5-6 metres and back up again. If not is there a more...

I have recently changed my rads. boiler is in the loft (converted to bedroom, so also has a rad). I took out some lengths of 22mm pipe on the first floor and replaced with 15mm.(it was a mess and noisy so decided to replace it while changing to new double finned rads) I cant seem to get all the...

Can anyone tell if the burner can generate air bubbles in the water of a sealed heating circuit. I have used an additive from wickes. I read somewhere that co2 can be produced when the water gets hot. Anyone have similar issues. I have no leaks or pressure drop. the rads are generally air free...

had this for 5 yrs , no probs. just replaced all the rads and keep getting air passing thru the pump after the burners have been on a while. The burner cuts out and eventually the air disappears. the cycle repeats when the burners kick in. should the auto air vent stop this. Is it CO2? bled the...