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Tony, thanks for your reply. I will be able to measure the temperatures on Wed with a pipe thermometer. Just using my hands I can tell that there is a huge difference in temp, the water leaving the boiler is very hot!

Thanks for your reply. The rads are all heating up nicely, even though boiler is kettling quite loudly and is cycling on/off every 2 to 3 minutes.

Thanks for your replys! Rads in bedrooms and hallways were replaced due to aesthetics and TRVs were also fitted at sames time. The chemicals were added (a year ago) via a drained f/e tank and then left in for about 2 weeks. This did produce a marginal improvement. My bathroom rad, which...

I would be most grateful if somebody could give me an opinion on the following symptoms. 10 year old potterton boiler, with new style circuit board on an open vented system. Once hot, the boiler kettles and then switches on and off every 2-3 minutes. Outlet pipe is very hot. Pump is also...