"Matt" wrote in message
...
"dennis@home" wrote:


Like I said that's how TRV based systems work.
The room stat has to be in the warmest room and switch the system on even
if
only that room wants heat.

No they don't. There is nothing to stop a thermostat being located
*anywhere* where it will receive the appropriate amount of output from
the heating system. Lots of thermostats are located in hallways with
no TRV's on the rads and controlling to a much *lower* temp than the
main living areas. As long as the rads are sized correctly, the
thermal losses through the structure are not wildly different, the
outer doors are not opened on a too regular basis and doors from an
area with a higher desired temperature are usually kept closed then
they function well.

No they don't.
Say you put the stat in the hall and set it to 15C as the temperature you
want in the hall.
Then the system will not provide any heat until the outside temp drops well
below 15C and the hall catches up.
I.e. no room set to a higher temp will get any heat until the temperature
has dropped well below what the owner actually wants.
In fact if the outside sits at 16C the rest of the house will also sit at
16C and the heating will not turn on.

Now go and think about where the correct place to put a room stat is.