Dunkirk Boilers · DXL-K Series
Dunkirk DXL-205K
The Dunkirk DXL-205K is a current cast-iron gas water boiler on the Hydrolevel w-4200 control: 205 MBH input for 172 MBH heating capacity and a 150 MBH net AHRI water rating at 84% AFUE, with 4.1 gallons of water content, a 7" flue and 7 burners at 420 lb shipping.
Key figures
- Max input
- —
- Max CSA output
- —
- AFUE
- 84 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Dunkirk DXL-205K in practice
The DXL-205K is one of the seven sizes in Dunkirk's current DXL-K Series. Its ratings row prints 205 MBH input, 172 MBH heating capacity and a 150 MBH net water rating (1.15 allowance) at 84% AFUE, with 4.1 gallons of water content, a 7" flue diameter and 7 burners; it ships at 420 lb.
The DXL-K uses a proven cast-iron heat exchanger with dry-leg end sections, a removable burner tube tray for service and a low-profile integrated draft hood that reduces installation height by up to 30 in. compared with external draft-diverter hoods. The internal Hydrolevel w-4200 control runs electronic ignition and a motorized vent damper; water connections are 1-1/4 in. NPT with a 1/2 in. NPT gas inlet (3/4 in. NPT on the 205K/235K) and 120 V AC power at less than 12 A.
Dunkirk backs the line with a 20-year non-prorated limited heat-exchanger warranty and a 5-year parts limited warranty for residential use. Boilers.ca records the printed row for the DXL-205K; no official Canadian-sales statement was found, so canadianStatus stays 'unknown', and gas, combustion and venting work belongs with a licensed contractor against the w-4200 boiler manual.
Best suited to
- 205-MBH-class residential loads (172 MBH heating capacity)
- Chimney-vented replacements wanting a low-profile integrated draft hood
- Serviceability-focused installs with the removable burner tray and w-4200 diagnostics
Applicability and support
- Model number
- DXL-205K
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
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 | 205 MBH | Input per the official ratings table (sea level to 2,000 ft; reduce 4% per 1,000 ft above 2,000 ft). |
| Output | ||
| Heating capacity | 172 MBH | Heating capacity per the official ratings table (DOE test procedures). |
| Net AHRI water rating | 150 MBH | Net AHRI water rating based on a piping and pickup allowance of 1.15 per the official ratings table. |
| Efficiency | ||
| Efficiency (AFUE) | 84 % | 84% AFUE per the DXL-K brochure ratings table. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Flue | 7" | Chimney-vented cast-iron boiler with a low-profile integrated draft hood and motorized vent damper (product page and brochure). |
| Physical and connections | ||
| Boiler water content | 4.1 gal | Water content per the official ratings table. |
| Dimensions | 27-1/2" wide x 32-1/8 in. high x 27-1/4 in. deep | Cabinet dimensions per the official ratings table (A width shown; height and depth as printed for the line). |
| Shipping weight | 420 lb | Shipping weight per the official ratings table. |
| Gas connection | 1/2 in. NPT gas inlet (3/4 in. NPT on this size); 1-1/4 in. NPT water return/supply. | As printed in the official ratings table connections block. |
| Electrical | ||
| Electrical | 120 V AC / 60 Hz / 1 phase, less than 12 A (15 A circuit recommended) | Per the official ratings table connections block. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Conversion kits are listed among the official options. |
Manuals
- DXL-K Brochure 240013194 (04/15/26) — ratings table240013194 (04/15/26)
- DXL-K Series w-4200 Boiler Manual Rev. B (240013750)240013750 Rev. B · 2025-06
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the DXL-205K's ratings?
205 MBH input, 172 MBH heating capacity and a 150 MBH net AHRI water rating at 84% AFUE per the DXL-K brochure.
What control does the DXL-205K use?
The internal Hydrolevel w-4200 control with electronic ignition and a motorized vent damper — not the earlier Fuel Smart Hydrostat.
What warranty does the DXL-205K carry?
A 20-year non-prorated limited heat-exchanger warranty and a 5-year parts limited warranty for residential use per the official brochure.
Questions about the Dunkirk DXL-205K?
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 — DXL-K Series gas boiler (DXL-205K ratings) · accessed September 9, 2026
- DXL-K Brochure 240013194 (04/15/26) · accessed September 9, 2026
- DXL-K Series w-4200 Boiler Manual Rev. B (240013750) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.