Navien NHB-110H
The Navien NHB-110H is the 110 MBH compact boiler of the NHB-H series: 10 to 110 MBH input at 95.0% AFUE with 11:1 turndown per the quick facts, stepping up to 80 lb in the same short cabinet.
Key figures
- Max input
- 110 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 10 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Navien NHB-110H in practice
The NHB-110H takes the compact NHB-H cabinet from 73 to 80 lb and the firing ceiling from 80 to 110 MBH, with its minimum fire rising only slightly to 10 MBH. Navien's quick facts list an 11:1 turndown for this model, so it can still track mild-weather loads despite the larger maximum.
It is the middle size of the NHB-H line and suits detached homes with radiators or in-floor loops whose heat-loss calculation lands near 100 MBH. Heating-only with no DHW codes, it connects on 1" NPT heating fittings, runs on 12 to 30 psi system pressure and vents in 2" or 3" PVC to 65 or 150 equivalent feet per the installation manual.
Best suited to
- Detached homes whose heat-loss calculation sits between 80 and 110 MBH
- Homes pairing a compact boiler with an indirect tank for hot water
- Owners who want an 80 lb wall-hung unit instead of a heavier mid-size boiler
Applicability and support
- Model number
- NHB-110H
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Navien. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Heating input, minimum | 10 MBH | Space-heating input. |
| Heating input, maximum | 110 MBH | Space-heating input. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95.0% AFUE per the installation manual. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler; domestic hot water via an indirect tank or separate appliance | |
| Venting and air | ||
| Venting | PVC, CPVC or approved polypropylene; 2" or 3" | Canada: plastic venting must meet ULC S636 where required. |
| Max. equivalent vent length, 2" | 65 ft | |
| Max. equivalent vent length, 3" | 150 ft | |
| Physical and connections | ||
| Weight | 80 lb | 36 kg; per the installation manual. |
| Width | 17.3 in | |
| Height | 23.8 in | |
| Depth | 12.8 in | |
| Gas connection | 3/4" NPT | |
| Heating water connections | 1" NPT | |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Separate Navien ratings per fuel. |
| Altitude rating | 10,100 ft | Per installation manual. |
| System water pressure | 12 – 30 psi | |
Manuals
Alerts documented for this model
Frequently asked questions
What is the firing range of the NHB-110H?
10,000 to 110,000 BTU/h of input per the installation manual, rated 95.0% AFUE, with 11:1 turndown listed in Navien's quick facts.
Does the NHB-110H fit where the NHB-80H fit?
Yes. The cabinet is the same 17.3 x 12.8 x 23.8 in; the 110H is 7 lb heavier (80 lb against 73 lb).
Is the NHB-110H available for propane?
Yes. Navien lists the NHB-H series for natural gas or propane with separate ratings per fuel; conversion and setup are licensed gas-fitting work.
Questions about the Navien NHB-110H?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Navien Canada — NHB-H series · accessed September 7, 2026
- NHB-H Installation and Operational Manual (EN) · accessed September 7, 2026
- NHB-H Service Manual, Ver 1.00 (July 2023) · Ver 1.00 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.