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Hello Help & advice required/appreciated. Have old Alpha combi needs replacing along with lots of other home improvements.... Feel drawn to Vaillant products but unsure about whether I need to have 618/624 system boiler plus 180? unistor or whether the 937HE combi would be adequate (and...

Hello, hoping for some expert advice about problem with my alpha CB28 (believed to be about 8yrs old, only been here for 18mths). I have read, and read the posts with very useful info about what seems to be a fairly common problem with hot water failure but can only get so far working mine...