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The NRCB is the first and only combination boiler on the market that can simultaneously provide domestic and space heating for residential applications. These simultaneous capabilities are easy to control and especially beneficial for applications that do not store or deliver heat energy efficiently. A user can, for example, take a shower without worrying about experiencing a corresponding drop in room temperature.

Another industry first is the NRCB’s use of 316L austenite stainless steel for the primary and secondary heat exchangers, which have higher corrosion resistance than traditional heat exchangers for increased durability and lifespan. A third flat plate heat exchanger for domestic water heating is also made of stainless steel.
It also far exceeds the toughest emissions standards. The unit’s fully modulating burner has a nitrogen-oxide emissions level of only 14 parts per million (ppm), far below the South Coast Air Quality Management District requirement of 20 ppm.

With flow rates ranging from 9.8 gpm to 11.1 gpm, the NRCB provides nearly twice as much flow as competitor models. Furthermore, a flow control valve, not offered by competitors, ensures a consistent temperature for domestic hot water demand, regardless of incoming water temperature.

Finally, unlike many other combination boilers, the NRCB has a built-in outdoor temperature reset control and is compatible with a recirculation loop without the need for accessory heat exchangers or controls.

Homeowners will enjoy the improved comfort made possible by the unit’s simultaneous ability to heat domestic water and room space. No longer will the possibility exist of a shower impacting room temperature.

They can also reap huge benefits from the NRCB’s 95% AFUE (Annual Fuel Utilization Efficiency). Its fuel-saving performance allows the NRCB to meet “Energy Star Most Efficient” standards, which represent the EPA’s highest efficiency rating. Higher efficiency translates to higher savings on monthly utility bills. Its efficiency has also earned the NRCB an Air-Conditioning, Heating and Refrigeration Institute (AHRI) certification, which qualifies homeowners for various state energy rebates.


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