3 b1 [; d, D. R6 l1 pHot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe.2 n7 t9 V0 d8 z- y
1 a% f' o! ]9 M( Y4 ?( GBeside,furnace hot water coil is made of metal. Some of it will come into the hot water.