Not a gret idea.7 e, l$ E" w+ [/ g
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Hot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe. 2 `% l/ u4 @8 T" ?: U! y2 }' I ; k6 L6 [/ @. fBeside,furnace hot water coil is made of metal. Some of it will come into the hot water.