Where should the pump go on my rayburn 355 for the cental heating ?

i'm not sure what you mean by interjector tee if this is the inlet feed from the header tank then it should be behind the pump the c/heating pipes should be 22mm from boiler until they split to go upstairs, downstairs also with gravity h/water the c/heating always affects the performance of the h/water normally the boiler is run on gravity for approx. 30 mins to get cylinder hot then when c/heating is on there will be enough heat to keep cylinder hot but if you use the h/water you may have to turn c/heating off again to replenish h/water

brian
January 2011

Thanks Brian, the pump is fixed in a vertical position and the arrow faces downwards, ie the flow back to the boiler, could it be too close to the boiler and interjector tee, it's about a foot between the pump and the boiler ( six inch down, six inch across). It seems to be affecting the gravity fed hot water pipes. Are my CH pipes to small at 15mm?

cold n fedup
January 2011

there's an arrow on the pump this should point to the boiler also pump speed should be on 1 or 2

brian
January 2011