[chelviweeme]

We have a "wet" system at home (gas boiler with water piping and radiators).

A few points the bear in mind:

1) The pressure as reported by your boiler will of course be higher when the heating is running compared to when its not.

2) If the system is running below the recommend pressure level, you run the risk of the boiler's pump pumping air instead of water, which is bad for its health and the pump motor.

3) As I understand it from our boiler guy, at lower pressure you also run more of a risk moving around any crap that might be in the pipes.

4) In addition to the bleed-value of each radiator, you should also have a bleed value ontop of the boiler itself.

5) If you are loosing pressure rapidly (within 1 week) that would suggest a leak in your pipework somewhere. Over longer periods of time its normal that you'll need to occasionally top the system up, as some water will be lost even without leaks.

6) When checking the pressure on the system and bleeding any radiators, always make sure that all the radiators are fully open, and none are closed off - otherwise when you open those radiators later the pressure will drop.

We had a busted pipe in our system last year - the pressure would go from 2bar to 0 in the space of about 30mins. Turns out the busted pipe was under our poured-concrete kitchen floor, so they isolated that section of pipe and re-plumbed the affected radiators above ground.