Eternal’s GU100 is an Energy Star-listed hybrid hot water heater that offers endless hot water with minimal pressure drop and 96% thermal efficiency. Its lightweight compact design, 1/2” gas line capability, top-mounted water connections and PVC venting allow for easy installation in any home, especially in retrofit applications. Features include a stainless steel heat exchanger with built-in reserve tank, full flow design and dual activation (temperature and flow sensing) that’s compatible with low flow Water Sense fixtures.