Not a gret idea.5 r: |' y7 X; ~
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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. ; F; i6 `* S5 X/ |. Z% ] " r4 ~$ l+ z& Y7 Z9 [7 iBeside,furnace hot water coil is made of metal. Some of it will come into the hot water.