Not a gret idea.( r( ]1 U" h& I6 p# b# Q3 \
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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. , E2 E. m. U! V* J: q8 k* M ) J1 ?# q3 p0 v* S/ FBeside,furnace hot water coil is made of metal. Some of it will come into the hot water.