Navien NPE-240S2 Condensing Tankless Water Heater – 199,000 BTU, 11.2 GPM, Natural Gas & Propane
Key features
- 199,900 BTU/h input with 0.96 UEF efficiency
- Up to 11.2 GPM at 35°F (2°C) temperature rise
- Dual stainless steel heat exchangers
- Ultra condensing performance
Please note: this is the US version of this product, designed for US 120V / 60Hz mains power (including any charger supplied) with a US plug. To use it in the UK you will need a suitable step-down voltage transformer, not just a plug adapter. Manufacturer warranty terms may differ for US-version products.
Please note: this is the US version of this product, supplied with US gas fittings. A UK-compatible regulator and hose are needed to use it with UK propane or butane bottles, and we recommend having the connection checked by a Gas Safe registered engineer. Manufacturer warranty terms may differ for US-version products.
Never run out of hot water again. The Navien NPE-240S2 Condensing Tankless Water Heater heats water on demand, saving space and energy compared with a tank water heater.
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. This unit delivers up to 11.2 gallons (42.4 L) per minute at a 35°F (2°C) 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 EZNavTM control panel with a built-in HotButtonTM interface and is compatible with NaviLinkTM 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 (7.3 m), 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 (2°C) 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)
- EZNavTM control panel with HotButtonTM interface
- Cascading capable with up to 12 units
- Common venting capable
- 1/2″ gas pipe compatible up to 24 ft (7.3 m)
- 2″ (5.1 cm) venting up to 60 ft (18.3 m), 3″ (7.6 cm) venting up to 150 ft (45.7 m)
- 3/4″ NPT connections for gas, hot, and cold water
- 120V, 60Hz, single-phase power supply
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
PNAV000037
Free UK delivery
Every order ships free to any address in the United Kingdom. Most orders arrive within 2–10 working days. As soon as your order is dispatched you will get a tracking link by email, and you can follow it any time on our Track Order page.
30-day returns
If you are not happy with your order you can return it within 30 days. Please contact us first so we can help and send you the return details.
Safe, secure card payment
We accept Visa, Mastercard, American Express and Maestro debit and credit cards, plus Apple Pay and Google Pay. Payments are processed securely by Stripe over an encrypted connection, and we never see or store your full card details.
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