Not a gret idea. B3 F9 F8 u' i' k a. l7 R5 k$ ?- a5 o( `1 D
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.( X2 y& G: @$ r8 l
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Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.