The game-changing NCB700 ON 42Kw gas combi boiler from Navien was designed for delivering hot water to multiple bathrooms simultaneously. Shattering all preconceptions of a combi boiler’s suitability for large properties, the NCB700 ON 42kW cleverly maximises recirculation of domestic hot water (DHW) to significantly reduce water wastage and offer a flow rate of 20.1 litres per minute at 30°C temperature rise.

Thanks to Navien ON technology, the ground-breaking Combi Crossover boilers have the power and performance of a system boiler and the advantages of a Combi boiler without the cylinder, eliminating slow heat-up times and low flow rates.

By putting hot water first, Navien’s innovative ON technology removes the fluctuation between hot and cold by providing quality, consistent and efficient hot water. With Navien ON, the possibilities are endless.

Key Features

• NaviCirc™ for simple and fast set up of hot water return system.
• Hydrogen-ready (20% blend) technology for futureproofing.
• Industry-leading turndown ratio of 10:1 for supreme efficiencies
• IPX4 rating provides protection from any water leaks.
• Built-in DHW recirculation pump for super fast hot water delivery.
• Powerful 42kW hot water output delivering up to 20.1lpm
• Easy to use built-in digital display panel displays energy usage.
• Stainless steel heat exchangers for optimum durability and long term efficiencies.
• Shower rating – 2 showers and 1 tap