"wkearney99" wrote in message
...
Is there such a thing ? can you use car anitfreeze in the system ?


Yes pretty common, around here, to use it. Used a lot in seasonal homes that
get shut down the middle of winter, but also for those that have a problem
with a seldom used zone freezing.
There is a special, non toxic, antifreeze you are supposed to use if you are
connected to a municipal water supply. I know some that use dexcool.