Setup with one pump and hot water heater hookup 1. Goes to house water coil  2. Return from house water coil  3. Power to pump, thermostat, and blower  4. Inlet to potable hot water coil from hot water heater 5. Outlet from potable hot water coil (not seen - inside of furnace) to hot water heater 6. To manual fill valve on front of furnace 7. Water supply to furnace from manual valve.
8. Optional outdoor hot water supply (just add a faucet!) 9. Drain  10.Blower/Fan  11.Pump (included) 12.Furnace Thermostat   ALL furnaces some with a hookup for 2 pumps now, at no extra charge. One pump is supplied.