Not a gret idea. 9 i$ `, R- A O9 V' b& k/ [6 r/ P6 ^/ F$ k0 W1 _$ ?
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. , O; G, C# j& A+ \' Y3 |$ d3 K- J) E% B' M" h- `- L4 i3 s
Beside,furnace hot water coil is made of metal. Some of it will come into the hot water.