Tankless water heaters operate differently than traditional water heaters as they only heat water when it is required instead of storing it. Condensing tankless water heaters use a secondary heat exchanger that uses exhaust to pre-heat the incoming water before it reaches the primary heat exchanger, which results in higher efficiencies. This condensing tankless water heater is state-of-the-art, and Energy Star qualified with a uniform energy factor of 0.95. This water heater features: a power direct vent design; the primary heat exchanger is constructed of commercial grade copper, which is more resilient against corrosion; a secondary heat exchanger made of tyle 316L stainless steel to protect against corrosion; flexible venting options including ULC S636 approved PVC, CPVC, polypropylene pipe, or category III/IV stainless steel venting can be used; internal freeze protection, and multiple safety features; it can be used in residential hydronic heating applications; takes up significantly less space than a tank-type water heater; and electronic ignition means there is no pilot light.

• Model #: GSWT-540H-N
• Solution for endless hot water
• Condensing technology
• Durable heat exchanger use HES35 copper for primary heat exchanger and stainless steel #316L for secondary heater exchanger
• Approved with ULCs636 PVC or CPVC or polypropylene venting in addition to Cat. IV stainless steel
• Vent with 3" (up to 70') or 4" (up to 100')
• 0" clearance to combustables
• Intefrated control and diagnostics
• Air fuel ratio (AFR) sensor
• Factory installed power cord
• Dual interal freeze protection system
• High altitude installations up to 10,000'
• Energy factor: 0.95
• Continuous maximum flow rates up to 10.0 GPM at 30°F temperature rise, 5.4 GPM at 70°F temperature rise
• Input maximum: 199,000 BTUs/hr
• Input minimum: 15,000 BTUs/hr
• Water connections: 3/4" NPT

WARRANTY INFORMATION:

• 15 year heat exchanger
• 5 year parts
• 22.5" H x 17.75" W x 10.75" D