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Posted by HeatPro on August 23, 2004 at 15:29:04:
In Reply to: hydronic heating in cold weather/hardwood posted by Steve Vanwieren on August 23, 2004 at 12:20:50:
It is common practice to use boiler antifreeze in hot water circuits. You can lose 15% of the heat transfer; but if you have more than you need, it won't be noticed. The expansion tank might have to be larger as the mixture expands more than water alone; but that is not a large problem. After you have fixed all leaks, the antifreeze can be in there for decades.
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