Not a gret idea. * S" b1 n3 m0 o" t( d$ Y$ R0 a2 _, M k( X- t0 W, e
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. 7 Z2 a" p7 b) K" b, [' J- w/ R2 O: z
Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.