>> It would be nice to know what kind of system configuration this is. System boiler?
>> combi boiler, what valves we have where? Control system?
I'm not familiar with terms, but I presume it's what's called a system boiler. There's no valves or control system. The boiler's probably over twenty years old! The only control is what is effectively a time switch. All rads have TRVs and the hot water cylinder has a TRV body, but no head. As I said, I'm sure that when I first viewed the prperty in April there was a head on the water cylinder TRV with a capillary running off somewhere, presumably to some sort of wax cylinder that sensed the water cylinder temperature. I'd just like to know what this sort of TRV is called so I can google it and find a TRV head for this TRV body. I've had no luck so far.
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TRVs new
TRVs new