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Hi I'm considering putting a secondary return loop and pump to help reduce the time it takes for the hot water to reach the taps since we installed an unvented cylinder in the garage. Currently the hot water pipe from the cylinder goes straight into the loft and across to central point where...

I have a Potterton Puma 80 combi boiler and am finding the flow rate for the hot water is considerably reduced when any other tap (hot or cold) is opened. I have checked the flow rate from the cold mains and it seems good enough. Can anyone suggest why this may be happening. I checked the...