What type of heating system have I got?

[Glenno]

Hi, I've a baxi back boiler downstairs & in the loft is a single hot water cylinder with an integrated cold one in the top of it. There is no other tank up there for the radiators.

When the heating is on I also get hot water. But when hot water only is selected the radiators upstairs also get warm.

I now want to move the bathroom radiator but i'm not sure how to drain the system? From reading this forum I believe I may have a primatic cylinder & am a bit worried about disturbing air bubbles etc.

Would it be better to leave the system full & try using a freeze spray while I connect the new pipes or is draining & re-filling my central heating a simple process.

 

[namsag]

You have a gravity fortic primatic cylinder. Can be a nuisance to refill but usually ok. Trouble with freezing is if it thaws before you have finished you get soaked