On Mar 15, 10:30*pm, "Mike Lyle"
wrote:
Adrian Brentnall wrote:
Mike Lyle wrote:
[...]

Why not just an ordinary electric blanket? But Nog has the heating
element already, so we're both out of the loop.

Be very careful with this idea - ordinary electric blankets aren't
intended to get wet. Having said that, take precautions with any use
of electricity around water (as in a greenhouse) - at the very least
one of those plug-in safety devices that will cut the power in the
event of problems...

You're quite right: homicidally stupid of me not to think of that.

--
Mike.

thanks for that everyone - I'm not clear why the sand has to be wet,
doesn't the heat dry it anyway? And should the thermostat be in the
sand or near the seedbed? I'll probably put three little propagators
on the top to hold the pots etc and assumed the thermostat would go in
one of them. Cheers