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Hi Johntheo5 and Exodon, Many thanks for the replies. Cleaning the boiler and replacing the baffles was a good thing. I was in error in my ost, there are 4 baffles fitted, the capping plate is called a baffle according to manual. I think It’s best to get a plumber in to fine tune and optimise...

I have a warmflow 70/90 boiler, some 16 years old, rated at 84.7 % efficiency and has never failed. I replaced the baffles today as per diagram in the warmflow manual. They were actually ok, Two of them were starting to warp in parts, one was fine with the boiler was surprisingly clean...