In an earlier contribution to this discussion,
Andrew Gabriel wrote:


Try measuring the temperature right next to the TRV head.
The TRV can't do better than keeping that constant.

It can't even do that under all conditions. A given knob setting and room
temperature will result in a particular flow restriction. But the *required*
flow restriction to maintain a constant room temperature will vary,
depending on the heat losses (heavily influenced by outside temperature) and
on pump pressure - which will depend on what all the other TRVs in the
system are doing. At best, TRVs can only provide crude temperature control.
--
Cheers,
Roger
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