Navien NPE-240S2 – Condensing Tankless Water Heater – 199,000 BTU

The Navien NPE-240S2 is a premium condensing tankless water heater built to deliver reliable, high-capacity hot water for residential or commercial applications. With a powerful input range of 13,300 to 199,900 BTU/h and an impressive 0.96 UEF, it’s ENERGY STAR® certified for efficiency and performance. This unit delivers up to 11.2 gallons per minute at a 35°F temperature rise and operates at flow rates as low as 0.5 GPM, making it ideal for both large-volume and low-demand applications.

Designed for indoor or outdoor wall-hung installation, the NPE-240S2 features ultra condensing technology and durable dual stainless steel heat exchangers. It includes the intuitive EZNav™ control panel with a built-in HotButton™ interface and is compatible with NaviLink™ for remote access. The unit is field convertible between natural gas and propane and supports cascading of up to 12 units for expanded demand. With ultra-low NOx emissions and 1/2″ gas line compatibility up to 24 feet, it offers maximum flexibility for a wide range of installations.

Features

• 199,900 BTU/h input with 0.96 UEF efficiency
• Up to 11.2 GPM at 35°F temperature rise
• Dual stainless steel heat exchangers
• Ultra condensing performance
• Low NOx emissions (20 ppm)
• Minimum flow rate: 0.5 GPM
• Indoor or outdoor wall-hung installation
• Field convertible gas system (NG or LP)
• EZNav™ control panel with HotButton™ interface
• Cascading capable with up to 12 units
• Common venting capable
• 1/2″ gas pipe compatible up to 24 ft
• 2″ venting up to 60 ft, 3″ venting up to 150 ft
• 3/4″ NPT connections for gas, hot, and cold water
• 120V, 60Hz, single-phase power supply
• CSA Listed, AHRI Certified, ENERGY STAR®, NSF Listed

Applications

• Residential homes with high simultaneous water demand
• Light commercial hot water systems
• Indoor or outdoor installations needing compact, wall-mounted design
• Projects requiring gas and venting flexibility
• Multi-unit cascade-ready setups