my boiler is a myson marathon 400B,
Mid 80s, very basic, it heats the CH and water at the same time.
works perfectly well for heating, but it is taking 2hrs to heat a tank of water (it used to take 40mins or so). i'm pretty sure this has happened gradually.
the thermo is always set to max
boiler was last worked on about 2.5 yrs ago, BG fixed (and i presume serviced) the boiler after the ignition failed.
it seems to me this could be a blockage or a valve failure of some sort - in the water path, which means i might be able to fix myself.
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!