A mate of mine appears to have a problem with his combi boiler. I'm not sure of the model but the boiler is a Vailant, a big thing, nearly 5ft high! Given that the boiler cost him 3 grand (with fitting) I'm assuming it has a high power rating but the hot water pressure upstairs is little more than a trickle (downstairs is fine). The boiler itself is situated in the upstairs bathroom.
Any ideas what could be causing the problem?
Any ideas what could be causing the problem?