i have had on going probs with my boiler, first it started loosing pressure from 1 1/2 bar to 0 in about 4 weeks and slowly its got worse, so now i have to re pressure it every day.. searched high and low and cant find any evidence of leaks... now i cant get any hot water but the radiators work fine. the only way i can get hot water is if i first turn on the radiators before i run any taps. can anyone help !!!