In an earlier contribution to this discussion,
PC Paul wrote:


FWIW it does have a cylinder stat as well as the wall stat, a pump
and a three position valve.

That's not what you said initially!

I *think* if boilers are still available that will run a vented
system while not containing a pump or being at mains pressure then
that will be a drop in replacement. TRVs are probably worth doing at
the same time while the system is drained and about to get a new shot
of inhibitor...

Sounds like it is a Y-Plan system - which already has all the necessary
boiler interlocks. But, AIUI, TRVs will be *required* - rather than
optional - to meet current regs.
--
Cheers,
Set Square
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