I asked the Inductotherm people about that, they say don't use automotive
type antifreeze, but you can add ethylene glycol to the water in very cold
areas.
Alan Black

"Carl Ijames" wrote in message
...
How about circulating propylene glycol instead of water, inside a copper
tubing load coil? Nontoxic, basically nonconducting in case of a leak,
and pretty cheap (Sierra antifreeze is about $7/gallon here in the US).
It's a little viscous until it warms up, and doesn't have the heat
capacity of water, but should be safer for you.

--
Regards,
Carl Ijames carl.ijames at verizon.net