Navien · NFB700-C Commercial Boiler
Navien NFB700-1000C
The Navien NFB700-1000C is the top model of the floor-standing NFB700-C commercial boiler series: 66 to 999 MBH of input with a 974 MBH heating capacity at 97.5% thermal efficiency, in the same 750 lb cabinet as the 800C.
Key figures
- Max input
- 999 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 66 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Navien NFB700-1000C in practice
The NFB700-1000C fires from 66 to 999 MBH at a printed 97.5% thermal efficiency, with the product page listing a 974 MBH heating capacity. It shares the large-frame cabinet, weight, water content, connections and 6" venting of the NFB700-800C, adding 200 MBH of ceiling at the top of the range with an unchanged 66 MBH minimum fire.
The product page prints its "Net AHRI Rating, Water" at 974 MBH — identical to the capacity figure. A net AHRI rating is normally below capacity, so the identical figure reads like a CMS copy-paste error on the page; Boilers.ca records the value as printed (2026-09-09) and flags it for re-verification against Navien's submittal or TDS documents before any net-rating basis is used for sizing.
The boiler weighs 750 lb dry and 1,059 lb with its 37 gallons of water, measures 23.8 x 73.3 x 33.0 in, and connects on 2 1/2" NPT water and 1 1/4" NPT gas fittings with 6" forced-draft direct venting; the product pages print a 12–160 PSI water pressure range and the stainless fire-tube heat exchanger sits in a cold-rolled carbon steel casing.
Best suited to
- Commercial hydronic plants whose load calculation approaches the 999 MBH ceiling
- Projects standardizing on the NFB700-C large frame across the 800C and 1000C sizes
- Plants with a 160 PSI system design needing the largest single-unit input in the series
Applicability and support
- Model number
- NFB700-1000C
- 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 | ||
| Input, minimum | 66 MBH | Per the product page. |
| Input, maximum | 999 MBH | Per the product page. |
| Output | ||
| Heating capacity | 974 MBH | Per the product page. |
| Net AHRI water rating | 974 MBH | As printed on the product page — identical to the 974 MBH capacity figure. A net rating equal to capacity appears to be a page error; recorded as printed (2026-09-09). |
| Efficiency | ||
| Thermal efficiency | 97.5 % | As printed on the product page (DOE test basis); the page labels the row "Thermal Efficiency", not AFUE. |
| Venting and air | ||
| Venting | 6" PVC, CPVC, approved polypropylene or approved stainless steel, or 6" special gas vent Type BH (Class III A/B/C) | Forced-draft direct vent per the product page; the series page states venting up to 150 ft. |
| Physical and connections | ||
| Weight | 750 lb | 750 lb dry; 1,059 lb with water, per the product page. |
| Width | 23.8 in | |
| Height | 73.3 in | |
| Depth | 33 in | |
| Water content | 37 gal | Per the product page. |
| Heating water connections | 2 1/2" NPT | Per the product page. |
| Gas connection | 1 1/4" NPT | Per the product page. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Ratings are the same for natural-gas models converted to propane use, per the product page; the series ships with a propane conversion kit. |
| Water pressure rating | 12 – 160 psi | 12–160 PSI water pressure range printed on the NFB700-C product pages. |
| Altitude rating | 10,100 ft | Per the NFB700-C series page. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
What is the input range of the NFB700-1000C?
66 to 999 MBH, per the product page, with a 974 MBH heating capacity at 97.5% thermal efficiency.
Why does the product page show the net AHRI rating equal to the capacity?
The page prints "Net AHRI Rating, Water: 974 MBH" — the same figure as its 974 MBH capacity. Net ratings are normally below capacity (the other NFB700-C models sit about 14% below), so the value reads like a page error and should be re-verified with Navien before it is used for sizing.
How does the NFB700-1000C differ from the NFB700-800C?
Only the ratings differ: input rises from a 799 to a 999 MBH ceiling and capacity from 779 to 974 MBH. Cabinet, weight, water content, connections and venting are identical, and both start at a 66 MBH minimum fire.
Questions about the Navien NFB700-1000C?
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 — NFB700-C series · accessed September 9, 2026
- Navien Canada — NFB700-1000C product page · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.