On Sun, 25 Oct 2009 22:16:26 -0000, gazz wrote:

i have one room where i want to be able to controll the temp closely,

How close is "closely"? +/- 0.1C +/-2C (normal sort of mechanical
room stat range). Can the temp be allowed to fall when the door is
opened, if so how long can it take to recover?

Rats are pretty hardy creatures, I'd expect they think they are in
the lap of luxury with a normal TRV. Sick ones I'd have though better
off in a sepeartely heated and controlled incubator sort of box.

i have an infared thermomitor, and i know roughly about the thing to set
up all the rads to have a certian flow and return temp,

You actually set to have a defined temp drop across each radiator the
actual flow/return temperatures are not particulary relevant to
setting of a given radiator.

Read the FAQ section on balancing a wet CH system.

--
Cheers
Dave.