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Comparison
Verdict in brief
The MODU-FIRE FD N2500 and N3000 share the same 500 MBH minimum input, 2" NPT gas connection, 3"-150# flanged supply/return, 1,185 lb operating and 1,220 lb shipping weights and 357 sq. ft. heated surface; the N3000 adds 500 MBH of input and 424 MBH of output, deepens turndown from 5:1 to 6:1, grows 2" taller and moves 254.7 GPM at 20°F ΔT versus 212.3 GPM.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | P-K MODU-FIRE FD N2500 | P-K MODU-FIRE FD N3000 |
|---|---|---|
| Minimum input | 500 MBH | 500 MBH |
| Input | 2,500 MBH | 3,000 MBH |
| Output | 2,123 MBH | 2,547 MBH |
| Efficiency (page) | 88 % | 88 % |
| Turndown ratio | 5:1 | 6:1 |
| Main gas connection | 2" NPT-F | 2" NPT-F |
| Boiler supply / return | 3"-150# ANSI flange (supply F / return M) | 3"-150# ANSI flange (supply F / return M) |
| Operating weight | 1,185 lb | 1,185 lb |
| Shipping weight | 1,220 lb | 1,220 lb |
| Boiler water content | 12.6 gal | 12.6 gal |
| Boiler HP | 65.7 | 78.9 |
| Heated wet surface area | 357 sq. ft. | 357 sq. ft. |
| Flow rate @ 20°F ΔT | 212.3 GPM | 254.7 GPM |
| Combustion air inlet | 8" dia. stub (10" with optional air-intake adapter) | 8" dia. stub (10" with optional air-intake adapter) |
| Exhaust vent | 10" | 10" |
| Shipping width | 32 in | 32 in |
| Shipping length | 54 in | 54 in |
| Shipping height | 68 in | 70 in |
P-K's submittal prints the N2500MFD at 2,500,000 BTU/hr input / 2,123,000 BTU/hr output with a 500,000 BTU/hr minimum and 5:1 turndown, and the N3000MFD at 3,000,000 / 2,547,000 with the same 500,000 BTU/hr minimum and 6:1 turndown — the deepest in the line.
Connections and design data are shared: 2" NPT-F gas, 3"-150# ANSI flanged supply/return, 160 psig maximum pressure, 250°F maximum allowable temperature, 220°F maximum setpoint, 65.7 and 78.9 boiler HP and 357 sq. ft. of heated wet surface.
The physical difference is small — 1,185 lb operating weight on both, with the N3000's shipping box 2" taller at 54" × 32" × 70" — but flow rises from 212.3 to 254.7 GPM at 20°F ΔT, so near-boiler piping and pump selection must follow the larger unit. Both require Category II or IV venting.
Patterson-Kelley
The P-K MODU-FIRE FD N2500 is a forced-draft non-condensing commercial boiler rated 2500 MBH input and 2123 MBH output in Patterson-Kelley's published submittal, with 5:1 turndown, a 500 MBH minimum input and a 1185 lb operating weight.
Patterson-Kelley
The P-K MODU-FIRE FD N3000 is a forced-draft non-condensing commercial boiler rated 3000 MBH input and 2547 MBH output in Patterson-Kelley's published submittal, with 6:1 turndown, a 500 MBH minimum input and a 1185 lb operating weight.
The N3000MFD at 6:1 versus 5:1 on the N2500MFD, per the submittal.
Yes — both print 3"-150# ANSI flanged supply and return connections.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.