( ?, a e9 x8 o W* [# OHot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe.9 Q t) p% b8 |1 B, I+ `
, p1 z- s+ [7 gBeside,furnace hot water coil is made of metal. Some of it will come into the hot water.