DIYbanter - View Single Post - Windmill nonsense.. Tilting at Wind mills

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Guy King wrote:
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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.

I suppose if you want to be posh you'll have to have a motor valve for
each room, controlled by the roomstat drawing hot from a manifold.

Yes. Or a standard trv controlled via a separate programmable
thermostat, which has some advantages such as very easy to retrofit,
and continues working ok if it fails. I'm fairly convinced this is the
way heating will go. As progstats steadily come down in price the case
for turning off the bedroom rad for much of the day will become
compelling.

NT