The GT-540-NIH is well suited for residential/commercial applications such as small restaurants and beauty salons. Complies with Ultra-Low NOx regulations. Utilizing commercial grade copper alloy for the heat exchanger tubing, the GT-540 is also suitable for heavier residential usages such as space heating or domestic recirculation systems. Remote control included as a standard feature. Certified up to 10,100 ft. altitude.

• ENERGY STAR® qualified
• 15-year limited Heat Exchanger Warranty, 5-year parts warranty, 1-year labor warranty for Residential applications
• .95 Energy Factor
• Continuous Maximum Flow Rates up to 10.0 GPM
• Commercial Grade Copper Heat Exchanger
• Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)
• Easy-Link up to four units without a Multi-Unit Controller
• Multi-Link up to 20 units with a Multi-Unit Controller
• 15,000 Natural Gas BTU Input Minimum
• 199,000 Natural Gas BTU Input Maximum
• Condensing Indoor model
• Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes

LOCAL ITEM ONLY.  CANNOT BE SHIPPED