On Wed, 16 Nov 2005 17:07:37 -0000, "Christian McArdle"
wrote:

Unless the run is dedicated and particularly long you don't *really*
need the zone valve, the output from these units when the fan is
switched off is very low.

Not really. With the pipe run as well, you could be looking at several
hundred watts from a hiline.

You will still need a programmable thermostat or suchlike to provide
independent timing and temperature control.


Yes that's why I said "Unless the run is dedicated and particularly
long" But considering the unit itself, when the fans are switched off
the actual heat gain to the room itself IS minimal, so much so you
would have great difficulty, short of grabbing the feed/return pipes,
in telling that the boiler was even firing.


--