We have a Vaillant 828e which from new gradually reduces pressure if I set the heating to go off at night and on in the morning, a plumber has said that this is to be expected, but as the boiler is in the attic it's not the easiest thing to keep an eye on. if I leave the heating on all the time the pressure stays ok!
Any ideas greatly appreciated.
Pete.
Any ideas greatly appreciated.
Pete.