Not a gret idea. ; t) z+ q: J, Y9 z& O5 x& T4 w, e+ h3 x: S4 z- |, T
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.1 t$ H$ f# H, M4 O5 ^% b/ F, p
+ B4 ]+ Z$ ?5 L# e% c& @Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.