flow and return

Hi my really old large house used to be a real mess in terms of several old heating systems that were cobbled together and extensions to it. Not to mentions redundant pipework from Back boilers and a Rayburn/Aga style device in the kitchen. Now - I have the original gravity fed Potterton...

1 Radiator not working, checked some forum tips and Ive ended up replacing Radiator, TRV and Lock Shield, as they were all very old, this did not help. There is an isolator on feed and on return plus a drain valve in between. So I shut the Isolator on return and opened up the drain valve and...

Just refilled my system and a few rads will not come on. I'm assuming I have an airlock somewhere but I just wanted to clarify something. On a cold radiator, I use a drain off valve or bleed key to take out a reasonable amount of water. I then find one of the pipes getting hot, however, it is...

Hello all. Just in case one of you knowledgable people understands the intricacies of flow and return planning I'd like to ask for your advice. I've just ripped out most of the old ground floors in my house and laid underfloor heating. I've laid a new flow and return from the existing...