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Lots of speedy replies! You guys should get out more :lol: Think I'll opt for a stainless hx then. The boiler being replaced is at least ten years old and I'd hope the next one lasts longer rather than shorter. Now that latent heat's being extracted from the flue gas and most boilers...

Hi, Anyone any advice on whether one or the other is better/worse? I have heard that there are potential problems with corrosion in aluminium heat exchangers in condensing bolilers because the condensate is corrosive. Does anyone have long term experience of how well the two perform...