I plan to bleed my radiators for the first time. I've read that If you have a gravity filled system the system will look after itself but if you have a combi boiler, the pressure will need to be checked after bleeding. How do I know what I have? The boiler is an HB Smith G200 Series that is about 30 yrs old. Thanks.
-Combi boiler usually heat the hot water also. So they heat the house serve as the hot water tank. - Gravity filled are just plan steam systems. All your boiler does is heat the radiators. Combi systems PSI usely goes upto 30-40 Gravity systems PSI
the most simple way of telling if you've gotta combi or gravity fed system is whether or not you have tanks in the loft and also weather or not you've got a hot water cylinder/tank. If you've got two tanks in the loft (generally one small one and one larger one) then you'll also have a hot water cylinder, if this is the case then your system is classed as a conventional gravity fed and NOT a combi. If however your boiler heats the hot water as well as the central heating then this is a combi, the quickest way to tell is whether it's gotta pressure gauge on the front of it.
