Description
Navien NHB-H Series55 MBH Condensing Heating Boiler
A compact condensing heating boiler for homes and small commercial spaces with modest heat loss, such as additions, apartments, garages and well-insulated bungalows. It modulates deeply so it can match a small load without short-cycling — exactly where oversized boilers waste fuel.
95% AFUE Low-NOx burner Direct-vent sealed combustion
55KBTU/h input
95%AFUE efficiency
24×24inCabinet size
120VStandard power
It is heating-only, so it pairs with an indirect tank when domestic hot water is needed, and it runs on natural gas or propane. The cabinet mounts indoors on the wall.
Technical specification
| Type | Condensing heating boiler (heating-only) |
|---|---|
| Input | 55,000 BTU/h (55 MBH) |
| Efficiency | 95% AFUE |
| Emissions | Low-NOx burner |
| Venting | Direct-vent sealed combustion, sidewall, PVC or polypropylene, no chimney |
| Domestic hot water | Not included — pairs with an indirect tank |
| Fuel | Natural gas or propane |
| Cabinet dimensions | 24 in. × 24 in., indoor wall-mounted |
| Power | Standard 120V |
| Certification | ENERGY STAR qualified |
| Best suited for | Additions, apartments, garages, well-insulated bungalows, small commercial spaces |
Installation notice
Installation must be performed by a licensed gas heating contractor.
Navien NHB-H Series boiler. Follow the installation manual, local gas and plumbing codes, and manufacturer instructions.
