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.