Not a gret idea. ' ^, D% b7 [* b 3 q7 q+ `, G3 P& z7 O& }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 w& I, V/ x. x$ s2 `$ Y' A& F
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Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.