I've recently moved into a new house which has gas central heating. When we moved in the gas boiler pressure was at 0. We filled the water system from the valve in the hotpress and bled the radiators. The boiler pressure was then at 1.5 when cold. Problem is - the water pressure on the boiler drops from 1.5 to 0.5 daily even though we only have the heating on for approx 2 hours per evening. So we are constantly having to top up from the hotpress. Also one of the radiators doesn't work - I'm not sure if this is related. Even the feed pipe into this radiator doesn't heat up. I've read the other posts but my situation seems more extreme. Not sure if I need a gas man or a plumber or do I just continue to top up daily. Help!