Navien NFB-200H
The Navien NFB-200H is the largest NFB-H heating-only boiler: 13.3 to 199.9 MBH of input at 95.0% AFUE with 15:1 turndown per the quick facts, sharing the 121 lb cabinet and 1 1/4" NPT connections of the NFB-175H.
Key figures
- Max input
- 199.9 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 13.3 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Navien NFB-200H in practice
The NFB-200H extends the NFB-H firing range to the 199,900 BTU/h ceiling while keeping the same 13,300 BTU/h minimum as the NFB-175H, which makes it the widest-ranging model in the series at a nominal 15:1 turndown per Navien's quick facts. Large homes and small multi-suite buildings whose calculated load exceeds the 175H are its territory.
Physically it is the twin of the NFB-175H: 17.3 x 17.3 x 27.6 in, 121 lb empty (148 lb with water), 4.5 USG of water content and 1 1/4" NPT heating connections. It remains heating-only with no DHW codes, rated 95.0% AFUE, and vents in 2" or 3" pipe — PVC by default, with approved polypropylene and stainless steel options — to 65 or 150 equivalent feet.
Best suited to
- Large homes and small multi-suite buildings needing up to 199.9 MBH of input
- Systems pairing a high-capacity heating-only boiler with an indirect tank
- Projects where the lowest practical minimum fire at 175 MBH-plus matters
Applicability and support
- Model number
- NFB-200H
- 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 | 13.3 MBH | Space-heating input. |
| Heating input, maximum | 199.9 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 | 121 lb | 55 kg; 148 lb (67 kg) with water. |
| Width | 17.3 in | |
| Height | 27.6 in | |
| Depth | 17.3 in | |
| Gas connection | 3/4" NPT | |
| Heating water connections | 1 1/4" NPT | |
| Water content | 4.5 USG | |
| 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 | 6 – 80 psi | |
Manuals
Alerts documented for this model
Frequently asked questions
What is the turndown of the NFB-200H?
Navien's quick facts list 15:1 turndown for the NFB-200H, whose 13,300 to 199,900 BTU/h firing range spans that ratio; the NFB-175H is listed at about 13.2:1.
Is the NFB-200H heavier than the NFB-175H?
No. Both models weigh 121 lb empty (148 lb with water) and share the same 17.3 x 17.3 x 27.6 in cabinet; only the firing ceiling differs.
Does the NFB-200H need a storage tank for hot water?
Domestic hot water requires an indirect tank or a separate appliance because the NFB-200H is heating-only. That is the arrangement Navien's NFB-H line is built around.
Questions about the Navien NFB-200H?
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 — NFB-H series · accessed September 7, 2026
- NFB-H Installation and Operation Manual (EN) · accessed September 7, 2026
- NFB-H Service Manual, Ver 1.0 (Jan 2021) · Ver 1.0 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.