how do i top up the water in my central heating system?

Answer 1

I don't know where you live, but here in the US, there is usually an automatic fill valve that keeps the boiler water up. If you don't have a line that comes from your cold water supply, through a funny looking valve assembly and then to the boiler, you would have to run a hose from a water tap to a fitting on the boiler. If there is a pressure gauge on the boiler, it should read about 5psi above the "static" pressure of the system. The static pressure is the weight of the water in a filled system from the pressure gauge to the highest point in the system. To get that, take the number of feet from the pressure gauge to the highest point times .43 equals static PSI, then add 5PSI to this and that is the final pressure you want on the gauge.

But if you are in the UK, none of the above may apply. LOL!

Answer 2

Go up to your loft and locate the central heating system's reservoir. It is usually a small plastic tank next to your main hot water tank. Check what's happening to it as it should automatically top up your central heating system with water from your mains. If the outlet to your system from the tank is blocked it could be the problem. Sometimes in older systems gunk build up and clog your piping. You may need to drain it and then refill. Professional help may be necessary, but it is doable if you are DIY capable.

Answer 3

it should be automatic..if you have a conventional heating system there is a tank in the loft called a header tank and it is self filling but if you have a combination boiler then you top it up with the mains inlet valve which pressurises the boiler

Answer 4

Should be automatic ?there is a separate header tank above the system , unless your ballcock has stuck shut in the tank

Answer 5

bleed them (the radiators)?????