Hi can anybody please help. We have a vaillant eco tec plus 824 boiler. The first thing we noticed was that we were not getting any heat from the radiators. Checked the pressure on the boilers guage and it was at zero. I used the 2 grey taps underneath to refill and the guage went back up to about halfway on the grey. Heating now back on. after a couple of weeks we had to start doing this every morning to get the heat back on. we called a plumber out and he just put on a bycycle pump and done a bit of this and that and it worked fine for a few months. The problem we have now is we have to turn the 2 grey taps at least twice a day and we also lose the hot water too until the grey taps have been turned to refill. the overflow pipe is also leaking and could fill a pint glass in an hr. The boiler is about 6 yrs old. please help