' _0 N9 }+ e7 K2 g6 ~ {4 e9 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. ) L H: n3 W3 \) N9 i* a( a! q$ _5 x5 p
Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.