Not a gret idea. 3 u" `/ i/ }7 ` f" ?% G 3 D$ z& B+ f& }- N& `( L. UHot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe.( D: W0 a9 H' n2 x" n7 D/ N
+ k/ q1 I* V( Y! d" }% kBeside,furnace hot water coil is made of metal. Some of it will come into the hot water.