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The cold spots can't be the problem - they have been there ever since we moved in 2 years ago. The banging pipes and noisy pump have only just started. Besides, I have already flushed these rads out and the water is pretty clean. I think the cold spots are just because the water flow is slow due...

I have a microbore open vent heating system with Ideal Elan RS50 propane boiler. The boiler has 2 thermostat settings (low 60C and high 82C). At low I have no problems. When set to high as the temperature reaches close to cut-off there is a continual banging in the pipes leading from the boiler...