Not a gret idea.8 T* p+ ]( m9 b8 O7 t
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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. ~- _: K: u1 f1 {: c- A" m 8 U4 p5 d! b- U1 v# M3 [& {- dBeside,furnace hot water coil is made of metal. Some of it will come into the hot water.