Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Dunkirk XEB-2 and Dunkirk XEB-3 are both non-condensing boilers in the Dunkirk Boilers XEB Series 4 line. The Dunkirk XEB-2 is rated 42.5 MBH input, 36 MBH heating capacity and 84.4% AFUE, and the Dunkirk XEB-3 is rated 75 MBH input, 63 MBH heating capacity and 84% AFUE. Dunkirk XEB-3 lists 32.5 MBH more input than Dunkirk XEB-2 (75 MBH against 42.5 MBH). Dunkirk XEB-2 carries the higher published AFUE at 84.4%, against 84%. Dunkirk XEB-3 lists 40 lb more shipping weight than Dunkirk XEB-2 (265 lb against 225 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Dunkirk XEB-2 | Dunkirk XEB-3 |
|---|---|---|
| Input | 42.5 MBH | 75 MBH |
| Heating capacity | 36 MBH | 63 MBH |
| Net AHRI water rating | 31 MBH | 55 MBH |
| Efficiency (AFUE) | 84.4 % | 84 % |
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater |
| Boiler water content | 1.75 gal | 3 gal |
| Shipping weight | 225 lb | 265 lb |
| Dimensions | 11" wide x 29 in. high x 23-1/4 in. deep | 14-1/4" wide x 29 in. high x 23-1/4 in. deep |
| Gas connection | 1/2 in. NPT gas inlet; 1-1/4 in. water return/supply. | 1/2 in. NPT gas inlet; 1-1/4 in. water return/supply. |
| Electrical | 120 V AC / 60 Hz / 1 phase, less than 12 A (15 A circuit recommended) | 120 V AC / 60 Hz / 1 phase, less than 12 A (15 A circuit recommended) |
| Fuel | Natural gas or propane | Natural gas or propane |
| Flue | 4" chimney / 3" side wall | 4" chimney / 3" side wall |
Published ratings: the Dunkirk XEB-2 is rated 42.5 MBH input, 36 MBH heating capacity and 84.4% AFUE; the Dunkirk XEB-3 is rated 75 MBH input, 63 MBH heating capacity and 84% AFUE. Dunkirk XEB-3 lists 32.5 MBH more input than Dunkirk XEB-2 (75 MBH against 42.5 MBH). Dunkirk XEB-2 carries the higher published AFUE at 84.4%, against 84%.
Dunkirk XEB-3 lists 40 lb more shipping weight than Dunkirk XEB-2 (265 lb against 225 lb). The boiler water content differs: the Dunkirk XEB-2 lists 1.75 gal, while the Dunkirk XEB-3 lists 3 gal. The dimensions differs: the Dunkirk XEB-2 lists 11" wide x 29 in. high x 23-1/4 in. deep, while the Dunkirk XEB-3 lists 14-1/4" wide x 29 in. high x 23-1/4 in. deep.
Both records print the same domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), gas connection (1/2 in. NPT gas inlet; 1-1/4 in. water return/supply.), electrical requirement (120 V AC / 60 Hz / 1 phase, less than 12 A (15 A circuit recommended)) and fuel (Natural gas or propane), per the cited sources.
Dunkirk Boilers
The Dunkirk XEB-2 is a current induced-draft cast-iron gas water boiler: 42.5 MBH input for 36 MBH heating capacity and a 31 MBH net AHRI water rating at 84.4% AFUE, with 1.75 gallons of water content, a 4" chimney / 3" side wall vent option and a Honeywell recessed control at 225 lb shipping.
Dunkirk Boilers
The Dunkirk XEB-3 is a current induced-draft cast-iron gas water boiler: 75 MBH input for 63 MBH heating capacity and a 55 MBH net AHRI water rating at 84% AFUE, with 3 gallons of water content, a 4" chimney / 3" side wall vent option and a Honeywell recessed control at 265 lb shipping.
The Dunkirk XEB-3 lists 75 MBH, against 42.5 MBH on the Dunkirk XEB-2, per the cited documentation.
The Dunkirk XEB-2 carries the higher published AFUE at 84.4%, against 84%.
It ships at 265 lb against 225 lb for the Dunkirk XEB-2, per the cited sources.
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.