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Hi all, After running the central heating for an hour the rads only get slightly warm. I have flushed the system recently. The Flow pipe from the Puma 80e only gets slightly warm as well. It does however have bursts of getting very hot for a few seconds. The boiler is constantly on full fire...

I've replaced a single Rad with a double rad upstairs. The top of the radiator is hot but the bottom is cold. The inlet pipe is very hot but the outlet pipe is cold. Any suggestions