Navien NPE-240A2 Condensing Tankless Water Heater | High Efficiency 199k BTU, Residential & Light Commercial

The Navien NPE-240A2 Condensing Tankless Water Heater delivers powerful, energy‑saving hot water for large homes and light commercial applications. With up to 199,900 BTU and ultra-high efficiency (up to 0.96 UEF), this natural gas or LP convertible unit provides endless hot water, built-in recirculation, and quiet, space‑saving performance.

Key Features and Benefits

• High efficiency condensing design (up to 0.96 UEF) for lower energy costs and reduced emissions
• 199,900 BTU output for whole‑home hot water, supports multiple fixtures simultaneously
• Built-in recirculation (ComfortFlow) to minimize wait times and reduce water waste
• Dual stainless steel heat exchangers for superior durability and corrosion resistance
• H2Air and cascade/parallel operation ready for multi-unit systems
• Low NOx compliant; suitable for many stringent regions
• Wi‑Fi capable with optional accessory for remote monitoring and control
• Indoor or outdoor installation options; compact wall‑mount to free up floor space

Specifications

• Model: Navien NPE-240A2 (Advanced series)
• Fuel Type: Natural Gas or Liquid Propane (field convertible)
• Maximum Input: 199,900 BTU
• UEF: Up to 0.96 (condensing)
• Hot Water Capacity: Up to approximately 11.2 GPM at 35°F rise (varies by inlet temp)
• Venting: 2" or 3" PVC, CPVC, or polypropylene; long vent lengths supported
• Recirculation: Internal pump and buffer tank (ComfortFlow)
• Noise: Quiet operation; fan-assisted sealed combustion
• Gas Connection: 3/4" nominal (check local code and manual)
• Water Connections: 3/4" hot/cold
• Electrical: 120V AC, 60Hz
• Installation: Indoor wall‑mount standard; outdoor with appropriate kit in approved climates
• Certifications: Low NOx, CSA certified; check regional compliance

Size and Dimensions

• Approximate Dimensions: 17.3" W x 27.4" H x 13.2" D
• Approximate Dry Weight: 67 lbs

Materials and Build

• Primary and secondary heat exchangers: Stainless steel
• Enclosure: Durable coated steel cabinet
• High-grade components for long service life and reliability

Ideal Applications

• Whole-home replacement for 50–80+ gallon tanks
• Homes with long plumbing runs needing recirculation
• Light commercial: small offices, cafes, salons (verify sizing)

What's in the Box

• NPE-240A2 unit
• Integrated recirculation pump and buffer tank
• Mounting hardware and manual (venting, valves, and accessories sold separately)

Installation and Sizing Notes

Professional installation recommended. Proper gas line sizing, venting, condensate drain, water quality, and combustion air are required. Sizing depends on inlet water temperature and simultaneous fixture demand; verify with a temperature rise and GPM calculation.

FAQs

Q1: How many bathrooms can the NPE-240A2 support?

A1: In typical conditions, it can support 2–4 bathrooms depending on flow rates and inlet temperature. Always size by expected GPM and temperature rise.

Q2: Does it have built-in recirculation?

A2: Yes. The NPE-240A2 includes an internal recirculation pump and buffer tank (ComfortFlow) to reduce wait times and cold-water sandwiching.

Q3: Can it run on propane?

A3: Yes. The unit is field convertible from natural gas to liquid propane. Follow the manufacturer’s conversion procedure and local codes.

Q4: What venting does it require?

A4: It supports 2" or 3" PVC, CPVC, or polypropylene venting with extended runs. Consult the installation manual for maximum lengths, elbows, and terminations.

Q5: What maintenance is recommended?

A5: Annual service is recommended, including flushing for scale, checking the condensate system, and inspecting the air/fuel and venting. Water quality treatment may be required in hard-water areas.

Keywords: Navien NPE-240A2 condensing tankless water heater, 199,900 BTU, high efficiency 0.96 UEF, built‑in recirculation pump, stainless steel heat exchanger, natural gas or propane, whole home endless hot water, low NOx compliant, indoor outdoor installation.