Endless Hot Water: Our tankless hot water heaters offer unlimited whole-home hot water flow and come equipped with Circ-Logic for pairing with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation Energy and Space Efficient: The tankless design of this small hot water heater saves on space and conserves energy as it heats only when necessary Optimal Water Pressure: With a hot water flow rate of up to 10 GPM, this tankless water heater provides a powerful, constant stream that can accommodate up to 6 appliances at once Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your water heater; We do not recommend installing a water heater without a technician Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively; Wifi monitoring available with Controlr module (not included) ENERGY STAR qualified with Uniform Energy Factor of 0.101