Not a gret idea. 7 C$ Q' ?: p- K. M P: \7 R/ ]8 ]. S4 y# ?
Hot water has went through all your home's internal pipes whereas cold water comes "direct" from your local reservoir. Which should be pretty safe.6 @' X& I: l& a- B% U' R8 ]! y
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Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.