Not a gret idea. . N0 g7 Z& O" l5 x8 _; y. G& d* O; ~ y1 n+ x' \( u8 F
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. ) R7 I9 o' H2 q, B Y& W) F* M 7 W4 q6 f1 g/ ]Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.