My Worcester Bosch combi boiler loses pressure over 24 hours from 1 bar down to almost zero. The boiler still works at this pressure but I am told it should not. I am wondering if I am damaging the boiler running at below recommended pressure.

(I know the pressure relief valve is faulty because it drips from the outlet when pressure is increased)

Colin Heaton, December 2009

if its only a prv fault get it changed or change it yourself, they inexpensive parts and easy to do and yes you will be causing risk of damage, your also putting fresh oxygenated (excuse spelling if its wrong) water into the heating system each time you top up. water + metal + air = lots of crap and rusting of many an item

ste, December 2009