On Mon, 08 Dec 2003 21:02:35 +0000, Troy wrote:

We had our first sub-zero temperatures last night and I was interested to
see the performance of my new Parasene "Frost Shield" 2Kw fan heater. I
only need frost protection for the greenhouse and so set it for just that -
(should protect at temperatures of 5°C and lower). Very disappointed this
morning to find that the greenhouse temperature had dropped to -1°C during
the night. The heater had switched itself on and off a few times but the
total on time was less than 2 hours.

Took it back to B&Q today and got a new one. This one seems to be working
the opposite way. It's a much warmer evening and it's (same settings)
already been on for over 4 hours with the greenhouse temperature currently
over 10°C.

Any ideas? Suggestions for a more reliable heater? I really don't want to
go back to paraffin :-(

TIA.

Dunno really,
I've only used them where they're on all the time because the house is too
big for them. All I can say is that on the ones I've seen the thermostats are usually very
crude affairs and unlikely to be accurate to any better than a few degrees,
so even with a good one you're going to need to monitor temperatures
carefully for a while, preferably with several themometers placed in
strategic places. Then mark the control at the position/s that give you the
temperature range you need. The alternative is to wire in a decent
thermostat but they cost more than your heater cost.

Rod