Not a gret idea.! M3 Z/ b% @+ ?7 C* f# y1 N3 M
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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. # A# g4 P1 p+ D' V6 t4 `& g4 X5 J5 O$ E$ ]
Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.