On Sun, 24 Oct 2004 01:51:34 +0100, "IMM" wrote:


"Andy Hall" wrote in message

The workshop has panel radiators plus a pump, thermostat, heating
pressure vessel and filling loop, so it is run totally separately from
the house circuit. The reason for doing this was so that anything
happening to the circuit in the outbuilding including freezing, leak
etc. cannot compromise the house system.
As a precaution, I did use a corrosion inhibitor and antifreeze
product (Fernox Alphi-11) in the secondary circuit, so the temperature
would have to drop to -20 or so for there to be a problem.

When the workshop requires heat, the thermostat operates the pump and
then the secondary circuit flow through the flow switch opens the zone
valve in the house and fires the boiler. The arrangement works very
well and is cheap to operate.

Previously, before insulation, the space took about 12kW of fan heater
to keep barely warm at huge cost. Nowadays, it seldom needs more
than 3kW provided by gas. The thermostat has a timer with frost,
economy and comfort settings which can be set at whatever temperatures
I like and changed manually or automatically. I have mine set to
background level, and then a PIR detector for when I am using the
workshop causes the temperature to be raised.

Should have had the rads doing background heating with the PIR switching in
fanned Myson heaters, as these warm up the place very fast. Ideal for
moving in and out of the place. They could be directional towards where you
most sit/stand.


The last thing that I need in a place where woodworking including
finishing is being done is fan heaters. I also want an even
temperature throughout the space. The radiators are oversized and
heating is rapid. Generally I set the minimum to 10 degrees and the
operating temperature to 18 degrees and there is little thermal mass
since the walls are ply. The design was carefully thought through for
the intended purpose.

As a generic solution for an office/games room , it could be
reasonable to use fan heaters if one doesn't mind the noise or cost
and is short of space.


..andy

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