* \* c* L0 L1 IHot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe.- G5 X$ ?" b5 Z5 T2 J
3 C( b t5 ^7 c* Q4 m# G/ e% z( oBeside,furnace hot water coil is made of metal. Some of it will come into the hot water.