Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The DCC-205 is the top DCC combi: DHW input reaches 205 MBH at 5.0 GPM (70 °F rise) against the DCC-150's 153 MBH and 3.5 GPM, central heating runs to 164 MBH against 125 MBH, and heating capacity rises from 113 to 153 MBH — but the 205 steps up to the deep 21-1/2" cabinet at 125 lb with 1" system connections and 5"/3" coaxial venting.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Dunkirk DCC-150 | Dunkirk DCC-205 |
|---|---|---|
| Central-heating input, minimum | 22 MBH | 29.5 MBH |
| Central-heating input, maximum | 125 MBH | 164 MBH |
| DHW input, minimum | 22 MBH | 29.5 MBH |
| DHW input, maximum | 153 MBH | 205 MBH |
| DHW flow rate at 70 °F rise | 3.5 gpm | 5 gpm |
| AFUE | 95 % | 95 % |
| Heating capacity | 113 MBH | 153 MBH |
| Net water rating | 98 MBH | 133 MBH |
| Turndown, heating mode | 5.7:1 | 5.5:1 |
| Turndown, DHW mode | 7:1 | 7:1 |
| Dimensions (H x W x D) | 30" x 17-3/4" x 13-9/16" | 30" x 17-3/4" x 21-1/2" |
| Weight | 103 lb | 125 lb |
Both are wall-hung combis of the DCC/DCB AI family at 95% AFUE (per the sell sheet). The DCC-150 is the shallow 13-9/16" cabinet at 103 lb; the DCC-205 uses the deep 21-1/2" cabinet at 125 lb with 1-1/4 gallons of water content, 1" system supply/return (G straight thread) and 3/4" copper-sweat DHW connections.
The sell sheet prints CH input of 22-125 MBH on the DCC-150 against 29.5-164 MBH on the DCC-205, heating capacity of 113 versus 153 MBH and net water ratings of 98 versus 133 MBH. DHW input runs 22-153 MBH at 3.5 GPM on the 150 and 29.5-205 MBH at 5.0 GPM on the 205.
The 205's minimum fires (29.5 MBH) sit well above the 150's 22 MBH, so in a low-load building the smaller combi condenses more hours. Both models sit on a page printing '(While supplies last)' with zero current documents, so the comparison is about servicing or finding parts for installed units rather than new purchases.
Dunkirk Boilers
The Dunkirk DCC-150 is the 153 MBH-class combi of the DCC 'AI' condensing line: 22 to 125 MBH central-heating input with DHW input to 153 MBH (3.5 GPM at a 70 °F rise), 95% AFUE and 113 MBH heating capacity. The DCC page prints '(While supplies last)' with no current documents, so this model is discontinued (sell-through).
Dunkirk Boilers
The Dunkirk DCC-205 is the 205 MBH-class combi of the DCC 'AI' condensing line: 29.5 to 164 MBH central-heating input with DHW input to 205 MBH (5 GPM at a 70 °F rise), 95% AFUE and 153 MBH heating capacity. The DCC page prints '(While supplies last)' with no current documents, so this model is discontinued (sell-through).
No — it is the combi's DHW flow at a 70 °F temperature rise as printed in the sell sheet table.
No — the DCC-205 is the deep 21-1/2" cabinet at 125 lb with 1" system connections and 5"/3" coaxial venting, versus 13-9/16" depth, 103 lb, 3/4" connections and 4"/2" coaxial venting on the DCC-150.
The official page prints '(While supplies last)' with no current documents — availability is limited to remaining dealer stock; new installations would normally be quoted with Dunkirk's current Royal series instead.
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.