The 240H Series offers high efficiency Ultra-Low NOx condensing technology allowing for the use of 3'' PVC venting and has 0'' clearance to combustibles. Remote control included as a standard feature. Indoor models are certified up to 10,100 ft. altitude. Provides a variety of installation options: indoor, outdoor and direct vent. Complies with Ultra-Low NOx regulations and meets the energy efficiency requirements of ASHRAE 90.1b-1992. The GTS-340-NIH tankless water heater uses up to 180,000 Btu/hr of natural gas to deliver an endless supply of hot water for a 2.5 bath home in northern climates and up to a 3.5 bath home in southern climates (one shower head per bath). Utilizing condensing technology, this heater is extremely efficient with an Energy Factor rating of 0.95 and is ENERGY STAR® qualified. With an industry leading 15-year limited warranty, the GTS-340-NIH tankless water heater provides years of hot water through innovation and quality.