Thanks everybody for your help on this.
It is clear to me now that I have a very big problem :cry: . Have ordered the books. I think I need to start from first principles and work out what the twit that installed this lot has done or more to the point what he should have done.
On the face...
ChrisR,
Many Many Thanks, it is safe to say that given what you just explained, my pipe guy has no clue. He changed one 6M pump for another 6M pump and charged me a fortune for the privaledge. On the basis of what you have said I will go get a bigger pump and upgrade as much of the main...
It's safe to say the system is not well installed. I get the impression from looking under the boards that it's a DIY job done very badly. I don't want to take the whole thing out if I can avoid it, as it would be a nightmare.
My working assumption given what works and what does not so far...
I have a large house over three floors, the boiler is oil. Ever since we moved in about 8 of the 23 rads in the house don't get hot. I have bled and carefully balanced the entire system with no luck. I can make any single rad hot by turning off several of the others.
I got a plumber in who...