Not a gret idea.8 W; s2 i* Y' F
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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.5 I% u5 b( ]+ R% x3 ?; L
" c# j. @! G# d7 ABeside,furnace hot water coil is made of metal. Some of it will come into the hot water.