Not a gret idea. 8 R+ C4 `! d, s2 `5 ^$ { + i5 ]8 c' p$ Y2 T5 JHot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe. 1 p7 [" P& H# ?: ~2 K/ X8 [. U. x' U# g9 y- Q
Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.