"GIOVANNA PERLES" wrote in message
....
Is there such a thing ? can you use car anitfreeze in the system ?
Thanks
Joe

If you do decide to introduce poisonous chemicals to the system, be sure to
put in a backflow preventer. While rare, it is possible under the right
conditions for the heater water to be at a higher pressure than household
water and back up into the drinking water. Many communities now require
them by code.

I don't see why it would not work but I don't see much need unless you leave
the building unheated. Many industrial heating/cooling systems have glycol
in them.
--
Ed
http://pages.cthome.net/edhome/