I have an old cottage with simple coalfired back boiler which heats hot water cylinder, no radiators. Problem is overflow from hot cylinder into overflow/topup tank, even when fire not on. Last night fire was out approx 11pm, water was hot but level in overflow tank was ok. This morning approx 7am water from tap was lukewarm. This afternoon, fire still not on, there is a steady dribble pouring from overflow outside onto pavement. Water inlet valve to system shut off all day so excess isn't coming from mains supply. Any ideas?
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!