Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Dunkirk Boilers · Series
The Dunkirk XEB Series 4 is the current induced-draft cast-iron gas water boiler line: five sizes XEB-2 through XEB-6 with inputs of 42.5 to 187.5 MBH, heating capacities of 36 to 158 MBH, net AHRI water ratings of 31 to 135 MBH and up to 84.4% AFUE, vented through a chimney or side wall.
Series facts
Up to 84.4% AFUE per the Series 4 sell sheet (XEB-2 at 84.4%; the remaining sizes print 84%).
The XEB Series 4 is documented on Dunkirk's current gas-boiler page as a cast-iron boiler whose induced-draft fan pulls flue gases through the boiler and exhausts them through a chimney or side-wall vent. The Series 4 sell sheet (240009715B, 08/19/25) prints five sizes at up to 84.4% AFUE: XEB-2 (42.5 MBH input / 36 heating capacity / 31 net water / 84.4% / 4 in. chimney–3 in. side wall / 225 lb), XEB-3 (75 / 63 / 55 / 84% / 265 lb), XEB-4 (112.5 / 95 / 82 / 84% / 322 lb), XEB-5 (150 / 127 / 109 / 84% / 370 lb) and XEB-6 (187.5 / 158 / 135 / 84% / 431 lb).
All sizes share a 29 in. height and 23-1/4 in. depth with widths from 11 to 24 in., water content from 1.75 to 6.75 gallons, 1-1/4 in. water connections and a 1/2 in. NPT gas inlet, running on 120 V AC at less than 12 A. The control is a Honeywell recessed operating control with digital temperature display and diagnostics, and the ASME-rated boiler carries a 20-year non-prorated heat-exchanger warranty for residential use.
Dunkirk keeps both the Series 3 and Series 4 pages live (the Series 3 page still carries 2023–2025 documents), so Boilers.ca records Series 4 as the current generation per the newest sell sheet and manual. No official Canadian-sales statement was found, so canadianStatus stays 'unknown', and gas, combustion and venting work belongs with a licensed contractor against the XEB Series 4 manual Rev. A.
Highlights
The XEB Series 4 sell sheet prints a 20-year non-prorated heat-exchanger warranty for residential use.
Models
One canonical page per model with input, output and efficiency kept separate.
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.
Dunkirk Boilers
The Dunkirk XEB-4 is a current induced-draft cast-iron gas water boiler: 112.5 MBH input for 95 MBH heating capacity and a 82 MBH net AHRI water rating at 84% AFUE, with 4.25 gallons of water content, a 4" chimney / 3" side wall vent option and a Honeywell recessed control at 322 lb shipping.
Dunkirk Boilers
The Dunkirk XEB-5 is a current induced-draft cast-iron gas water boiler: 150 MBH input for 127 MBH heating capacity and a 109 MBH net AHRI water rating at 84% AFUE, with 5.5 gallons of water content, a 4" chimney / 3" side wall vent option and a Honeywell recessed control at 370 lb shipping.
Dunkirk Boilers
The Dunkirk XEB-6 is a current induced-draft cast-iron gas water boiler: 187.5 MBH input for 158 MBH heating capacity and a 135 MBH net AHRI water rating at 84% AFUE, with 6.75 gallons of water content, a 4" chimney / 4" side wall vent option and a Honeywell recessed control at 431 lb shipping.
| Specification | Dunkirk XEB-2 | Dunkirk XEB-3 | Dunkirk XEB-4 | Dunkirk XEB-5 | Dunkirk XEB-6 |
|---|---|---|---|---|---|
| input-min | — | — | — | — | — |
| input-max | — | — | — | — | — |
| output-max | — | — | — | — | — |
| Efficiency (AFUE) | 84.4 % | 84 % | 84 % | 84 % | 84 % |
| turndown | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — |
| Shipping weight | 225 lb | 265 lb | 322 lb | 370 lb | 431 lb |
Read the full comparison: Dunkirk XEB-2 vs Dunkirk XEB-3 →
Read the full comparison: Dunkirk XEB-3 vs Dunkirk XEB-4 →
Error codes and alerts
Manuals
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.
Services for Dunkirk Boilers boilers
Five: XEB-2 (42.5 MBH), XEB-3 (75), XEB-4 (112.5), XEB-5 (150) and XEB-6 (187.5), with heating capacities of 36 to 158 MBH per the Series 4 sell sheet.
Yes — the induced-draft fan allows exhaust through a chimney or side-wall vent, with 4 in. chimney and 3 in. side-wall flue options printed by size in the sell sheet.
Yes — the Series 4 page, sell sheet (08/19/25) and manual Rev. A (09/2025) are current; the older Series 3 page also remains live with its own documents.
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
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.