Engineer did not turn up on day boiler was meant to be fitted. I had to call company and chase. No apology or contact from head office. Boiler fitted next day but electrician not available so electrician had to come back on a different day (without the part he needed to finish job). Boiler and thermostat finally fitted but boiler keeps losing pressure: F22 so have to boost pressure on daily basis whilst I wait for them to get in touch with me despite several emails. Closed for xmas now. But will contact again on 27th when they re-open. They seem to assume it is for me to do daily maintenance on a 3 week old Vaillant boiler. Really? My old boiler worked better than this. Why pay £3,000 for not hot water and lots of hassle. Not happy from Colchester. X