On Wed, 12 Nov 2008 08:15:48 -0800 (PST) someone who may be RobertL
wrote this:-

1) don't have it in a room with supplementary heating (including a
kitchen)

2) don't have it in a room with excessive solar gains

3) have it somewhere you want heated all the time (avoid a little
used dining room)

A hall or north facing bedroom can be good places.


before TRVs I woudl have said that you put the thermostat at the
place where you want the temperature to be most constant - in the
living room for example.

Conflicts with my first point. If there is a coal/wood/gas/electric
fire then the rest of the house may well be cold while the living
room is at the right temperature.

But with TRVs doing the temperature control in each room why do people
have thermostats any more?

Imagine a heating system with all TRVs and just a time clock, the
pump could spend some considerable time pumping against a closed
head. Fit a bypass to the system and the boiler is likely to short
cycle when the house is near temperature. Add a thermostat in the
place which cools down most rapidly and these problems are solved.
There are more sophisticated ways of doing all this, but it adds
cost.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54