Not a gret idea. . c" P8 ~0 n2 M8 F 4 w5 e& F3 U- w- c/ }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. 0 p- y5 P6 \, B* m8 J+ n+ _1 Y; |, G# j7 f1 ^% `
Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.