Arrived onsite to customers home, they have water pouring out of the drain line from either the relief line or back flow preventer discharge. Isolated off back flow preventer, water stopped. Diagnosis is a failed backflow preventer. Decided that a mini feeder would be the best route to replace this backflow preventer since the current one is not approved for hydronic systems. Customer approved work. We will have to return with mini feeder. Drained and flushed water heater in garage, set back to correct temperature, confirmed recirc pump is not air locked. Thank you for choosing CPI Plumbing and Heating Inc. 2-9-2023 (skip) Customer showed me the location of her hot water tank and indicated that she also had a circulation pump attached to the system. I Shut off the power to the pump and then turned off the gas supply to the tank. Then shut off the incoming supply water to the tank and ran a hose from the tank drain out to the sewer drain in the driveway. Open the drain valve on the