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 DC 33-124 lifts the DC line to 124 MBH input and 110.3 MBH output while staying at 94% AFUE like the 29-106. It allows a 4.0 USgpm maximum DHW flow against 3.3, holds more water (0.5 vs 0.37 USG), and both models weigh 85 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | IBC DC 29-106 | IBC DC 33-124 |
|---|---|---|
| Input, minimum | 28.5 MBH | 33 MBH |
| Input, maximum | 106 MBH | 124 MBH |
| CSA output, minimum | 26.3 MBH | 30.4 MBH |
| CSA output, maximum | 94.3 MBH | 110.3 MBH |
| Efficiency (AFUE) | 94 % | 94 % |
| DHW input | 28.5 – 106 MBH | 33 – 124 MBH |
| Max. DHW flow rate | 3.3 USgpm | 4 USgpm |
| Power use at full fire (internal pump) | 128 W | 130 W |
| Weight (empty) | 85 lb | 85 lb |
| Pressure vessel water content | 0.37 USG / 1.4 L | 0.5 USG / 1.9 L |
| Max. operating pressure, space-heating coil | 43.5 psig | 43.5 psig |
| Max. equivalent vent length, 3" | 120 ft | 120 ft |
| Max. equivalent vent length, 2" | 35 ft | 35 ft |
The 33-124 covers 33–124 MBH input and 30.4–110.3 MBH output, against the 29-106's 28.5–106 MBH input and 26.3–94.3 MBH output. Both are rated 94% AFUE, so the step up buys capacity rather than efficiency.
The DHW side improves more noticeably: maximum flow rises from 3.3 to 4.0 USgpm, while activation stays at 0.5 USgpm and DHW temperatures remain 104–149°F. The 33-124 also carries the larger 0.5 USG (1.9 L) vessel and an 11 USgpm maximum boiler flow against the 29-106's 10 USgpm.
Both models weigh 85 lb (39 kg), and both carry the DC table's 8.9–32.3 kW output-kW figure — on the 29-106 it duplicates the 33-124 column and conflicts with the HC table's 7.7–27.6 kW. The 29-106 is covered by manual 120-183-A-R9; the 33-124 is not named in either captured DC I&O manual.
IBC Technologies
The IBC DC 29-106 is a discontinued DC combi rated 28.5–106 MBH input and 26.3–94.3 MBH output at 94% AFUE. Its DC spec-table output-kW cell is printed 8.9–32.3, a figure the HC table prints as 7.7–27.6 for the same range.
IBC Technologies
The IBC DC 33-124 is a discontinued DC combi rated 33–124 MBH input and 30.4–110.3 MBH output at 94% AFUE, with a 4.0 USgpm maximum DHW flow and 0.5 USG of vessel water.
Yes. Both are rated 94% AFUE in IBC's DC specification table.
The DC table prints 8.9–32.3 kW for both; the HC table prints 7.7–27.6 kW for the 29-106 range, so Boilers.ca flags the DC page as printed rather than treating the duplicate as correct.
Neither captured DC I&O manual names the 33-124; Boilers.ca cites the specification table and the shared DC/HC controller and user documents.
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.