Not a gret idea. 5 M2 N3 v$ B4 S3 m 1 I1 ~. ]: R- E7 L; G& L# }0 ^) F7 VHot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe.# m4 U3 }6 L, G4 D; S u
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Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.