P-K MODU-FIRE FD N750

The P-K MODU-FIRE FD N750 is a forced-draft non-condensing commercial boiler rated 750 MBH input and 638 MBH output in Patterson-Kelley's published submittal, with 5:1 turndown, a 150 MBH minimum input and a 800 lb operating weight.

CurrentCanadian status unknown

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Key figures

Max input: 750 MBH
Max CSA output: 638 MBH
AFUE: —
Min input: 150 MBH

Natural gasHeating-onlycommercial

Input is gas energy consumed; output is heat delivered. Never size from input alone.

P-K MODU-FIRE FD N750 in practice

Patterson-Kelley's submittal prints the N750MFD at 750 BTU/hr input and 638 BTU/hr output, with a 150 BTU/hr minimum input and 5:1 turndown. Design data: 160 psig max pressure, 250°F max allowable temperature, 220°F max setpoint, 19 boiler HP, 116 sq. ft. heated wet surface and 63.8 GPM flow at 20°F ΔT.

Connections are a 1 1/4" NPT-F main gas, 2 1/2" NPT (supply F / return M) supply/return, a 8" dia. stub combustion-air inlet and a 6" (5" with adapter) exhaust vent. Shipping dimensions are 54" × 32" × 52" (L×W×H); operating weight is 800 lb, shipping weight 820 lb and water content 6.2 gallons. The submittal lists ASME CSD-1, FM Global 6-4 and GE GAP (IRI) compliance and an integrated NURO-series control.

P-K describes the MODU-FIRE FD as a full-modulation forced-draft design that 'changes both fuel and air at a constant ratio to match boiler output to actual heat demand' with smooth 5:1 turndown tracking down to 20% of rated capacity and up to 88% efficiency. No official Canadian-sales statement was found, so canadianStatus stays unknown.

Best suited to

Commercial plants documenting an installed MODU-FIRE FD N750 against P-K's submittal
Hydronic systems in the 750 MBH input class
Retrofit projects that need a small-footprint forced-draft boiler

Applicability and support

Model number: N750MFD
Canadian availability: unknown
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.

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Specifications

Published specifications

Values as published by Patterson-Kelley. Units are shown with every value; notes flag conflicting sources or missing figures.

P-K MODU-FIRE FD N750 specifications
Specification	Value	Note
Input
Input	750 MBH	Input (BTU/hr) as printed on the model submittal.
Minimum input	150 MBH	Min input (BTU/hr) as printed on the model submittal.
Output
Output	638 MBH	Output (BTU/hr) as printed on the model submittal.
Efficiency
Efficiency (page)	88 %	'Up to 88% efficiency' as printed on the P-K MODU-FIRE FD product page; the submittals do not print a per-model efficiency row.
Venting and air
Combustion air inlet	8" dia. stub	As printed on the model submittal.
Exhaust vent	6" (5" with adapter)	As printed on the model submittal; MODU-FIRE FD requires Category II (condensing-negative pressure) or Category IV (condensing-positive pressure) venting.
Physical and connections
Main gas connection	1 1/4" NPT-F	As printed on the model submittal.
Boiler supply / return	2 1/2" NPT (supply F / return M)	As printed on the model submittal.
Operating weight	800 lb	As printed on the model submittal.
Shipping weight	820 lb	As printed on the model submittal.
Boiler water content	6.2 gal	As printed on the model submittal.
Shipping length	54 in	Shipping dimensions printed as 54" × 32" × 52" (L×W×H) on the submittal; listed here as depth × width × height.
Shipping width	32 in	Second dimension of the submittal's L×W×H shipping box.
Shipping height	52 in	Third dimension of the submittal's L×W×H shipping box.
Heated wet surface area	116 sq. ft.	As printed on the model submittal.
Electrical
Power supply	208–240 V, 1 ph, w/neutral, 60 Hz	As listed on the submittal; operating current under 6 A (N750/N1000) or under 10 A (N1500/N2000) / under 15 A (N2500/N3000).
Operating limits and other
Turndown ratio	5:1	As printed on the model submittal.
Boiler HP	19	As printed on the model submittal.
Flow rate @ 20°F ΔT	63.8 GPM	As printed on the model submittal.
Max. pressure	160 psig	ASME Section IV design data on the submittal.
Max. allowable temperature	250 °F	ASME Section IV design data on the submittal.
Maximum setpoint	220 °F	ASME Section IV design data on the submittal.
Control	Integrated NURO-series boiler control	Listed on the submittal's boiler-controls panel.
Listings	ASME CSD-1 standard; FM Global 6-4 Section 1.0; GE GAP (IRI) GAP.4.1.0 / GAP.4.1.3	As listed on the submittals.

Manuals

P-K MODU-FIRE FD 750–3000 Installation and Owners Manual (Rev J, 1/25)Rev J · 2025-01
MODU-FIRE / VELOX N750–N1000 Submittal (Rev D, 3/10/2025)Rev D · 2025-03
MODU-FIRE / VELOX N1500–N2000 Submittal (Rev D, 8/5/2024)Rev D · 2024-08
MODU-FIRE N2500–N3000 Submittal (Rev C, 9/3/2024)Rev C · 2024-09

Alerts documented for this model

Services

Related parts & service

Frequently asked questions

What are the MODU-FIRE FD N750 ratings?

P-K's submittal prints 750 BTU/hr input and 638 BTU/hr output with a 150 BTU/hr minimum input, 5:1 turndown, a 800 lb operating weight and a 820 lb shipping weight.

What venting does the MODU-FIRE FD N750 require?

P-K's submittal requires Category II (condensing-negative pressure) or Category IV (condensing-positive pressure) venting, with a 6" (5" with adapter) exhaust connection.

Is the MODU-FIRE FD condensing?

No. P-K lists MODU-FIRE FD under its non-condensing boilers; it is a forced-draft design with up to 88% efficiency and full modulation.

Questions about the P-K MODU-FIRE FD N750?

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.

Call 778-909-5731 Request service

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Sources and verification

Patterson-Kelley — P-K MODU-FIRE FD product page (models and features) · accessed September 9, 2026
P-K MODU-FIRE FD 750–3000 Installation and Owners Manual, Rev J (PDF) · Rev J · accessed September 9, 2026
MODU-FIRE / VELOX N750–N1000 Submittal, Rev D (PDF) · Rev D · accessed September 9, 2026
MODU-FIRE / VELOX N1500–N2000 Submittal, Rev D (PDF) · Rev D · accessed September 9, 2026
MODU-FIRE N2500–N3000 Submittal, Rev C (PDF) · Rev C · accessed September 9, 2026

Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.