I am a gas engineer, viessmann only go up to 35kw on heating side that I can see, atag is only 30kw, inter gas do a 40kw but only has 2 years warranty and not to keen on them
I am a gas engineer, viessmann only go up to 35kw on heating side that I can see, atag is only 30kw, inter gas do a 40kw but only has 2 years warranty and not to keen on them
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