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Mandate I think your explanation is perfectly plausable and sounds more likely than mine. Now that you have pointed out the part about the tube it does indeed seem the way it works. Thanks for clearing that up, your help is much appreciated.

Strangely enough I already looked at this site and saw the pictures which is why i came to the conclusion above. As you can see in the cut away of the tank there is a dome shaped piece of metal and a shaft above it. To me this is how it works, the dome seals of the sides of the cylinder by...

Can anbody enlighten me cuz there isn't much info out there on primatics. Here goes: Inside the hotwater tank is another cylinder . On the underside of the cylinder is a dome which is connected to a shaft which moves up and down, this allows the dome to move up into the cylinder. When...

Hi Chris, thanks for the reply I really appreciate it. I will drain the system again. I will also take off all the rads and flush them outside with the hose. Is there any way to isolate the HW tank so I can try and flush the system with the mains cold water, like loop it or just bung it...

Hello all. New to the forum and to central heating. Hoping one of you guys can help. We have Primatic heating system I've just discovered unfortunately too late. Let me explain. 2 of our 4 radiators weren't working, 1 upstairs and 1 downstairs, so I tried bleeding the rads to no joy, no air...