Product Description. The Eccotemp 45H-NG Outdoor Natural Gas Tankless Water Heater is the largest outdoor model of the Eccotemp tankless line. Rated at impressive 6.8 GPM and 150,000 BTU per hour, the 45H-NG can meet all the hot-water needs of a standard home or apartment with one or two bathrooms, as well as smaller commercial applications.
Gas Tankless Water Heaters. Greentherm and Therm gas tankless water heaters include high efficiency gas condensing and non-condensing tankless water heaters with more compact models and greater installation versatility to satisfy every residential and commercial application.