Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The DMG-240 and DMG-380 are Dunkirk's current condensing DMG pair with very different physical packages: the DMG-240 is wall-hung (or on an optional floor base) at 241 MBH maximum input, 95% AFUE (ENERGY STAR) and a 50 psi ASME rating, while the DMG-380 is a floor-standing commercial unit at 379 MBH, 95% thermal efficiency and 80 psi ASME — roughly 110 lb heavier, with 1-1/2" boiler connections against the 240's 1".
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Dunkirk DMG-240 | Dunkirk DMG-380 |
|---|---|---|
| Input, minimum | 36 MBH | 35 MBH |
| Input, maximum | 241 MBH | 379 MBH |
| AFUE | 95 % | — |
| Thermal efficiency | — | 95 % |
| Heating capacity | 216 MBH | 348 MBH |
| Net water rating | 188 MBH | 303 MBH |
| Turndown | 6.7:1 | 10.5:1 |
| Dimensions (W x H x D) | 17-3/4" (W) x 31-1/16" (H) x 23" (D) | 23-5/8" (W) x 50" (H) x 25-1/2" (D) |
| Ship weight | 145 lb | 255 lb |
| Boiler water content | 0.8 gal | 4.6 gal |
| ASME rating | 50 psi | 80 psi |
| Venting | Coaxial polypropylene 3"/5" or 2-pipe polypropylene 3" | Coaxial polypropylene 4"/6" or 2-pipe polypropylene 4" |
| Connections | Boiler supply/return 1"; system supply/return with LABOR SAVER manifold 1-1/2" copper; condensate 3/4" NPT; gas 3/4" NPT | Boiler supply/return 1-1/2"; system supply/return with LABOR SAVER manifold 1-1/2" copper; condensate 3/4" NPT; gas 1" NPT |
Both models share the DMG construction recipe — 316L stainless steel heat exchanger and burner, direct spark ignition with combination flame sensor and igniter, built-in boiler loop pump, digital display with diagnostics, optional plug-and-play CSD-1 kit and the included LABOR SAVER manifold — and both pages carry current documents.
The brochure table separates them on capacity and mounting: the DMG-240 fires 36-241 MBH to 216 MBH of heating capacity and a 188 MBH net water rating at 95% AFUE with a 6.7:1 turndown, while the DMG-380 fires 35-379 MBH to 348 MBH of capacity and a 303 MBH net rating at 95% thermal efficiency with a 10.5:1 turndown.
Installation differences decide between them: the DMG-240 hangs on the wall (17-3/4" wide, 145 lb ship weight, 0.8 gallons water content, 50 psi ASME, 3/4" gas, 1" boiler connections); the DMG-380 stands on the floor (23-5/8" wide, 255 lb ship weight, 4.6 gallons water content, 80 psi ASME, 1" gas, 1-1/2" boiler connections) with 4"/6" coaxial venting against the 240's 3"/5".
Dunkirk Boilers
The Dunkirk DMG-240 is the wall-hung condensing boiler of the DMG pair — positioned 'Residential/Light Commercial' on the official page: 36 to 241 MBH input, 216 MBH heating capacity, 95% AFUE (ENERGY STAR), 6.7:1 turndown and a 50 psi ASME rating, with an optional floor base kit.
Dunkirk Boilers
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.
The DMG-240 is wall-hung with an optional floor base kit; the DMG-380 is the floor-standing commercial model with leveling legs.
The DMG-240 prints 95% AFUE (ENERGY STAR) while the DMG-380 prints 95% thermal efficiency — both as printed in the official brochure table.
Yes — both product pages carry current documents (Rev. A manuals, spec sheets and submittals through 2025/2026), so Boilers.ca records both as current.
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.