Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The DCB-100 and DCB-125 are the mid-size DCB heating-only boilers: both at 95% AFUE in the shallow 13-9/16" cabinet, with the DCB-125 raising input from 93.5 to 125 MBH maximum and heating capacity from 85.4 to 113 MBH (net water 98 against 74 MBH) while its minimum fire steps from 16.6 to 22 MBH and its weight from 94 to 104 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Dunkirk DCB-100 | Dunkirk DCB-125 |
|---|---|---|
| Central-heating input, minimum | 16.6 MBH | 22 MBH |
| Central-heating input, maximum | 93.5 MBH | 125 MBH |
| AFUE | 95 % | 95 % |
| Heating capacity | 85.4 MBH | 113 MBH |
| Net water rating | 74 MBH | 98 MBH |
| Turndown, heating mode | 5.6:1 | 5.7:1 |
| Dimensions (H x W x D) | 30" x 17-3/4" x 13-9/16" | 30" x 17-3/4" x 13-9/16" |
| Weight | 94 lb | 104 lb |
Both are wall-hung, heating-only models of the DCC/DCB AI family at 95% AFUE in the 30" x 17-3/4" shallow cabinet (13-9/16" deep) with 1 gallon water content and 3/4" system supply/return (G straight thread).
The sell sheet prints CH input of 16.6-93.5 MBH on the DCB-100 against 22-125 MBH on the DCB-125, heating capacity of 85.4 versus 113 MBH and net water ratings of 74 versus 98 MBH.
The DCB-125's 22 MBH minimum fire sits 5.4 MBH above the DCB-100's 16.6 MBH floor, so in a modest-load home the smaller boiler tracks shoulder-season demand more closely. Both pages print '(While supplies last)' with no current documents — guidance applies to service and parts of installed units.
Dunkirk Boilers
The Dunkirk DCB-100 is the 93.5 MBH-class central-heating model of the DCB 'AI' condensing line: 16.6 to 93.5 MBH input at 95% AFUE with 85.4 MBH heating capacity and a 74 MBH net water rating. The DCB page prints '(While supplies last)' with no current documents, so this model is discontinued (sell-through).
Dunkirk Boilers
The Dunkirk DCB-125 is the 125 MBH-class central-heating model of the DCB 'AI' condensing line: 22 to 125 MBH input at 95% AFUE with 113 MBH heating capacity and a 98 MBH net water rating. The DCB page prints '(While supplies last)' with no current documents, so this model is discontinued (sell-through).
The sell sheet prints 113 MBH of heating capacity and a 98 MBH net water rating against 85.4 MBH and 74 MBH on the DCB-100.
No — the DCB-100 is 94 lb and the DCB-125 is 104 lb per the sell sheet, both in the 13-9/16" deep cabinet.
Both sit on pages printing '(While supplies last)' with zero current documents — end-of-life sell-through, limited to remaining dealer stock.
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.