Rheem. Achieve home heating and hot water from a single source with the Integrated HVAC & Water Heating System powered by Tankless Technology. When combined with the maker’s cooling equipment, the system offers a single solution for home comfort. The system circulates hot water through a hydronic air handler for heat and then back to a tankless water heater to ensure that no water is wasted. The combination reduces the number of gas appliances in a home. Only one gas line and vent system are required. 866.720.2076. www.rheem.com.