Not a gret idea. 0 Z3 I* p; J# t: k1 x/ z, d 5 Q0 W: F% S; }4 dHot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe.- I. r$ L) U4 [+ ^
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Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.