I asked the same question when I registered and got slagged. Plenty of years of development.
I have been involved with heat pumps for a while (2002 my first) combis are not my thing.
Any heat pump engineers on here?
Exactly I do a lot with heat pumps and some with very large heating circuit volumes and quite big expansion vessels much bigger than 24 liter. My current 230v unit is past its best thats why I thought I would ask
https://www.ebay.co.uk/itm/Atkinson-Filter-Valve-Element-Seals-AVF-1000-KIT/251024134393?epid=621101426&hash=item3a723450f9:g:WCsAAOSwruVa8wqg
try ebay always a good source
I thought that but never knew any boiler had that in 1989 when this was fitted (very good job though)). Its a dirty system that works as it does linked with a neutralizer. Pray for me when I fit a condensing boiler in the future