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.

Upgrade to high-efficiency heating and endless hot water. The Navien NHB-150H Condensing Heat-Only Boiler uses condensing technology to cut fuel use while delivering reliable comfort for your home.

Navien NHB-150H – Condensing Heating Boiler – 150,000 BTU

The Navien NHB-150H is a high-efficiency condensing wall-hung boiler designed for indoor residential and light commercial heating. It delivers up to 95% AFUE with a 15:1 turndown ratio, providing precise temperature control and energy savings. Compact and wall-mounted, it measures 17.3″ (44 cm) wide by 23.8″ (60 cm) high and 12.8″ (33 cm) deep, weighing 80 pounds. (36.3 kg) The boiler supports forced draft direct venting with flexible vent pipe options and lengths, allowing versatile installation.

This model includes advanced user controls and a built-in 3-zone controller to simplify multi-zone heating systems. The NHB-150H is field convertible for use with natural gas or propane, meeting diverse installation needs.

Features

95% AFUE efficiency with 15:1 turndown ratio
Field convertible between natural gas and propane
Electronic ignition system
Stainless steel primary and secondary heat exchangers
Built-in 3-zone controller for zone valves or pumps
Vent compatible with 2″ (5.1 cm) or 3″ (7.6 cm) PVC, CPVC, polypropylene, and special gas vent piping
Maximum vent length: 2″ (5.1 cm) up to 65 feet (19.8 m), 3″ (7.6 cm) up to 150 feet (45.7 m)
Compact wall-hung design: 17.3″ (44 cm) W x 23.8″ (60 cm) H x 12.8″ (33 cm) D; 80 lbs (36.3 kg)
Advanced controls with backlit interface, click-wheel, and setup wizard
Safety devices including flame rod, air proving switch, gas valve and ignition detectors, high limit switches, and vent installation detector
Zero clearance to combustibles