The Natural Philosopher wrote:
David Hansen wrote:

How a perfect thermostat in say the hall reacts to heat emitted in a
bedroom/office I'm not sure.


Try a TRV on the radiator in the office/bedroom..

IME these are not very effective, nor can they ever be. Rad temp
inevitably has some effect on sensor temp, therefore the best they can
be made to do is change throughput gradually in response to changing
room temp. Thus inevitably there is a fairly wide swing of regulated
temp in cold weather versus mild.

In practice they appear to work ok simply because theyre not needed in
the first place, thus their poor attempts at regulation go unnoticed,
and theyre generally set to well above the wanted temp, effectively not
giving significant regulation. But in an unbalanceable system they just
do not work well, and can not. The only way to temperature regulate a
room is to measure the temp away from the rad, not next to it.


NT