Richard wrote in :


Is it necessary/advisable/prudent/worthwhile to do so?

Yes; some radiatpors or branches have lower impedance than others, so the
hot water flow will favour them and not heat the others so much.

What is the 'suitable' value for the differential?
20 deg F/11 deg C

Where do I get suitable clip on thermometers, and what are they called?

Erm.... someone will know; I much prefer to use an infrared thermometer
like this

http://www.maplin.co.uk/module.aspx?...r&ModuleNo= 4
6033&doy=18m8

Watch the wrap!

Its instant - the clip on pair takes ages to settle, you can read both ends
in seconds with one of these, it does lots of other things, and you can
play with the laser. Some folks put a bit of blacl tape on the rad to
assist in taking a reading

When the rads are balanced, each one should be working at an equal
temperature and proportion of it's rated power, (dependant on heatant
temperature). So you'll get more out of the big ones than the little ones

One, the farthest/highest impedance - should have it's lockshield wide
open; don't get sucked into gradually screwing them all down till they're
all shut DAMHIK

mike