We are losing pressure on our GSHP based UFH system. I have been unable to find any leaks so guessing its the expansion vessel which is an old second hand one anyway. Is it worth splurging on a stainless replacement as I hear the steel ones have a pretty short life these days?

 

Thanks 

3 minutes ago, Beau said:

hear the steel ones have a pretty short life these days?

 

If your water is inhibited not sure why you would have an issue.

 

 

8 minutes ago, Beau said:

I hear the steel ones have a pretty short life these days?

 

I see very few problems, only perished bladders, not the cylinders themselves. 

The last one sprung a sudden leak making a right old mess. Probably 15 years old at the time. Had a second hand one laying about which I popped in. I stumbled on a thread somewhere with lots of guys saying new ones were rubbish and only lasting 5-7  years.  Good to hear maybe they are not as bad as that thread made me think. Yes the system has inhibitor on it

1 minute ago, Beau said:

lots of guys saying new ones were rubbish and only lasting 5-7 years

They are possibly also saying radiators are rubbish and don't last, also don't understand why all the black sludge is in the heating system.