Ok, so we moved into this house about 3 months ago and I recently found out that the DHW is not working. Here is what I understand. The circuit is there, with a B&G pump (third circuit from the left in the pic) but the pump has never been wired up ( fresh tin on the wires and no conduit run) The heat exchanger is in place and the Bradford White water heater has been in the house since day 1 (14 years) I dont know why they went through all the trouble to do this but never wire the pump up and run thermostatically control it??? Furthermore, once the circuit is working then how does the water in the water heater tank then circulate through the HX? Does it really on convective flow? Im confused on this, so Im hoping there are a few guys here that can help me understand what I need to do to get this working correctly. Ive asked a lot of hvac guys but none that are familiar with boilers and DHW.