- Dual Stainless Steel Heat Exchangers for Heating
- Built with durable stainless steel, these heat exchangers resist corrosion, ensuring a longer lifespan and improved heat recovery from flue gases for exceptional efficiency.
- Up to 5.4 GPM at 70°F Temperature Rise for DHW
- The separate stainless steel flat plate heat exchanger for domestic hot water (DHW) offers the highest flow rates among combi-boilers in the industry.
- Dual Venturi System with Field Gas Convertibility
- The dual Venturi system enhances combustion control and turndown ratio. Every NCB-H Series combi-boiler includes an orifice conversion kit for easy field conversion from natural gas (NG) to liquid propane (LP).
- Easy Access to DHW Module and Valves
- All components of the DHW module, including the water feed valve, flow adjustment valve, mixing valve, and 3-way valve, are conveniently located behind the circuit board for effortless serviceability.
- Turndown Ratio (TDR) of 15:1 for DHW and Up to 11:1 for Heating
- The advanced gas flow control system offers a high turndown ratio, reducing energy waste and minimizing boiler cycling while improving temperature control for DHW.