Templifier water heaters, from 500 to 3000 MBh, use unique technology to recover large amounts of heat that would typically be rejected from the building and then use that heat for processes, building heat, or domestic hot water. Templifier produces up to 160 °F water for use in service hot water heating or reheat application and can reduce energy costs in both HVAC and process applications, with one-year payback in many cases. Using HFC-134a refrigerant which has no ozone depletion potential and no phase-out schedule, these water heaters provide significant environmental impact advantages over a fossil-fired boiler or an electric resistance heater for green solutions in all types of heat recovery building applications.