Hi ollski, thanks for the reply.
I did consider this and can still follow your suggestion. I think I will then have a different issue of refilling the system if inhibitor needs to be added but this is a different topic ;)
Richard
I have a Worcester Bosch Greenstar 42CDi combi boiler and I need to replace a TRV on a radiator.
I understand that to do this I need to drain the system, however I don't have any drain valves on any of the radiators and my boiler is pretty much boxed in by kitchen cabinets.
Any ideas how I can...