NCB-H offers industry leading DHW features including the highest maximum BTU/h for DHW (210,000), highest flow rate of 5.4 GPM at 70° rise and a DHW turndown ratio of 15:1.
Highest DHW maximum BTU’s in residential combi-boilers...
up to 210,000 per hour
Highest DHW flow rate @ 70°F rise...
up to 5.4 GPM
Highest number of BTU sizes for
the North American residential
Highest residential combi DHW TDR...
15:1 for all models
Highest residential combi heating
TDR... up to 11:1
Highest number of built-in zone controls for valves or pumps... up to three
Highest full lineup 2" PVC venting lengths... up to 65 feet
Highest number of cascade capable
units with NPE tankless water heaters... up to 15
Lowest minimum fire BTU for residential combi-boilers... as low as 10,700
Navien's innovation and technological advancements have done it again. The new NCB-H is taking combi performance to the highest levels. As the competition tries to get closer, Navien ingenuity keeps advancing their lead.
Designed for exeptional heating performance and longevity
Navien’s NCB-H generates enough hot water to run up to 3 showers and a dishwasher at the same time.
Separate DHW stainless steel flat plate heat exchanger
Navien’s new innovative domestic hot water heat exchanger now generates even more hot water, giving customers the ability to run up to 3 showers and a dishwasher, all at the same time.
Integrated boiler pump for space heating and DHW. No need for an external boiler pump saving installation time, space and costs.
DHW SS flat plate heat exchanger 5.4 GPM @ 70°F temperature rise. One of the highest flow rates in the industry.
New mixing valve.
New easy access 3-way valve.
New flow adjustment valve.
Water feed valve.