Dunkirk Boilers · DMG (DMG-240 / DMG-380)
Dunkirk DMG-380
The Dunkirk DMG-380 is the floor-standing condensing boiler of the DMG pair — a 'Commercial Offering' per the official page: 35 to 379 MBH input, 348 MBH heating capacity, 95% thermal efficiency, 10.5:1 turndown and an 80 psi ASME rating.
Key figures
- Max input
- 379 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 35 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Dunkirk DMG-380 in practice
The DMG-380 is the floor-standing member of Dunkirk's DMG condensing pair, which the official page labels a 'Commercial Offering'. The brochure table prints 379 MBH maximum input (35 minimum) with 348 MBH heating capacity, a 303 MBH net water rating and 95% thermal efficiency, with a 10.5:1 modulation turndown ratio per the product page.
It is built around a 316L stainless steel heat exchanger and burner with direct spark ignition and a combination flame sensor and igniter, a built-in boiler loop pump, a digital temperature display with diagnostics, optional plug-and-play CSD-1 kit, and the included LABOR SAVER manifold. Dimensions are 23-5/8" (W) x 50" (H) x 25-1/2" (D) with a 255 lb ship weight, 4.6 gallons water content, 80 psi ASME rating, boiler supply/return at 1-1/2" and gas at 1" NPT.
The DMG-380 page carries current documents (Rev. A manual MGC-22-380-REV-A dated 2023, spec sheets and submittals through 2025/2026), so this model is recorded as current. The ratings are the US-market figures Dunkirk prints; no Canadian listing was verified on the pages checked on September 9, 2026, so canadianStatus stays 'unknown'. Gas work belongs with a licensed contractor against the DMG-380 IOM.
Best suited to
- Commercial heating plants needing up to 348 MBH of condensing capacity
- Floor-standing installations with leveling legs and an 80 psi ASME rating
Applicability and support
- Model number
- DMG-380
- 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.
Specifications
Published specifications
Values as published by Dunkirk Boilers. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, maximum | 379 MBH | Input maximum in MBH as printed in the official DMG 240/380 brochure table. |
| Input, minimum | 35 MBH | Input minimum in MBH as printed in the official DMG 240/380 brochure table. |
| Output | ||
| Heating capacity | 348 MBH | Heating capacity in MBH as printed in the official DMG 240/380 brochure table. |
| Net water rating | 303 MBH | Net water rating in MBH (piping and pickup allowance of 1.15) as printed in the official DMG 240/380 brochure table. |
| Efficiency | ||
| Thermal efficiency | 95 % | 95% thermal efficiency as printed in the official DMG brochure table; the product page rates '95% Thermal Efficiency' with a 10.5:1 turndown. |
| Venting and air | ||
| Venting | Coaxial polypropylene 4"/6" or 2-pipe polypropylene 4" | Coaxial and 2-pipe diameters as printed in the official DMG 240/380 brochure table. |
| Physical and connections | ||
| Dimensions (W x H x D) | 23-5/8" (W) x 50" (H) x 25-1/2" (D) | Per the official DMG 240/380 brochure table. |
| Ship weight | 255 lb | Per the official DMG 240/380 brochure table. |
| Boiler water content | 4.6 gal | Per the official DMG 240/380 brochure table. |
| ASME rating | 80 psi | Tested for 50 psi (DMG-240) or 80 psi (DMG-380) ASME, maximum allowable working pressure, per the brochure; the product page lists a 50 psi relief valve. |
| Heat exchanger | 316L stainless steel | As printed on the official pages and brochure. |
| Electrical | ||
| Power supply | 120 V ac, 60 Hz, 1 phase, less than 12 A | Per the official DMG 240/380 brochure (15 A circuit recommended). |
| Operating limits and other | ||
| Turndown | 10.5:1 | Modulation turndown ratio as printed on the product page. |
| Connections | Boiler supply/return 1-1/2"; system supply/return with LABOR SAVER manifold 1-1/2" copper; condensate 3/4" NPT; gas 1" NPT | Per the connection/tappings table in the official DMG 240/380 brochure; LABOR SAVER primary/secondary manifold included. |
| Control | Digital temperature display with diagnostics and programmable settings | High limit/electronic ignition control module with a built-in boiler loop pump, direct spark ignition and combination flame sensor/ignitor, per the brochure. |
Manuals
- DMG-380 Generic Boiler Manuals Rev. A (MGC-22-380-REV-A)MGC-22-380-REV-A (Rev. A) · 2023-11
- DMG 240/380 Brochure (240011835 Rev. 09/02/21)240011835 Rev. 09/02/21
Alerts documented for this model
Frequently asked questions
Is the DMG-380 a condensing boiler?
Yes — it is condensing on a 316L stainless steel heat exchanger, rated 95% thermal efficiency with a 10.5:1 turndown ratio.
Is the DMG-380 wall-mounted?
No — the DMG-380 is a compact floor-standing design with leveling legs; the DMG-240 is the wall-hung member of the pair.
What is the DMG-380 rated for?
379 MBH maximum input (35 minimum), 348 MBH heating capacity, a 303 MBH net water rating and an 80 psi ASME rating, per the official brochure table.
Questions about the Dunkirk DMG-380?
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
- Dunkirk — DMG 380 product page · accessed September 9, 2026
- DMG 240/380 Brochure (240011835 Rev. 09/02/21) · accessed September 9, 2026
- DMG-380 Generic Boiler Manuals Rev. A (MGC-22-380-REV-A) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.