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Hi Dave, no it's not a Vantage. It is an ordinary indirect cylinder, a few years older than the boiler. Regards Gareth

Hi, I have a 4 year old Vaillant Thermocompact 620E (pressurised conventional boiler). 1 I don't think it is working properly: it does heat the radiators and hot water but sometimes not very quickly. 2 I would like to find out exactly how it should be operating: i.e. It has a modulating...