I want to fit a new thermostatic value to some radiators in this new house
I've bought. It is a conventional boiler system (which I'm not used to)
though it is so antiquated I shall be replacing it with a combi next year
The radiator valve looks like 22mm then there is the thermostatic bit and it
goes into a 15mm copper pipe vie what looks like a bit of a reducer. This
valve is made by Danfos and I think it is quite old. I'm used to seeing
everything as 15mm. Anyway if I went shopping for a new themostatic valve
can I get one thats 22mm (or whatever it is) or so I need some attachments.
Do I need to be concered about the valve if I swap my boiler to a combi next
I think that it's unlikely that you'll find any 22mm valves around - they
are mostly 15mm - or even 10mm.
Your 15mm pipe will connect directly to the valve with no adaptor - although
you will have to remove the existing adaptor, and may need to extend the
pipe to suit. The part of the new valve which screws into the radiator will
have a 1/2" BSP thread. If the old one is 3/4" BSP (which seems likely if it
fits a 22mm pipe), you'll need a 3/4"BSP to 1/2"BSP reducer.
I can see no reason why any new valves you fit should not be compatible with
a combi if you fit one later.
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