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Thanks NB. Really helpful. The central heating is running fine with temperatures not getting as high as 95c. Do you think the heat exchanger could be blocked again after it's been replaced 8 months ago? Is there potential for the internal small hot water tank itself to get blocked? We live in...

Hi guys, I'm after a bit of advice please. I have a Glow-worm Xtramax HE boiler and a few months ago had an engineer replace the secondary heat exchanger for the hot water, quickly followed by the CH pump which sprung a leak. We've also fitted a magnaflow unit to help clean out any rubbish...