Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The DC 29-106 adds about 10 MBH of input and 8.4 MBH of output over the DC 15-96 but drops from 96% to 94% AFUE, raises the minimum fire from 15 to 28.5 MBH, and moves to a 3 USgpm minimum boiler flow. The 15-96 is the more efficient of the two.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | IBC DC 15-96 | IBC DC 29-106 |
|---|---|---|
| Input, minimum | 15 MBH | 28.5 MBH |
| Input, maximum | 96 MBH | 106 MBH |
| CSA output, minimum | 14.5 MBH | 26.3 MBH |
| CSA output, maximum | 85.9 MBH | 94.3 MBH |
| Efficiency (AFUE) | 96 % | 94 % |
| DHW input | 15 – 96 MBH | 28.5 – 106 MBH |
| Max. DHW flow rate | 3 USgpm | 3.3 USgpm |
| Power use at full fire (internal pump) | 128 W | 128 W |
| Weight (empty) | 105 lb | 85 lb |
| Pressure vessel water content | 0.5 USG / 1.9 L | 0.37 USG / 1.4 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 29-106 covers 28.5–106 MBH input and 26.3–94.3 MBH output, while the 15-96 covers 15–96 MBH input and 14.5–85.9 MBH output. The extra headroom is modest, but the 29-106's minimum fire is nearly double the 15-96's, which matters in a low-load home where the boiler spends most of its time at part load.
Efficiency moves the other way: IBC rates the 15-96 at 96% AFUE and the 29-106 at 94%. DHW flow rises slightly to 3.3 USgpm on the 29-106 from 3.0 USgpm, both with 0.5 USgpm activation, and the 29-106's minimum boiler flow steps up to 3 USgpm from 2.
The 29-106 is lighter at 85 lb (39 kg) against the 15-96's 105 lb (48 kg), and its output-kW row carries the DC-page discrepancy: the DC table prints 8.9–32.3 kW while the HC table prints 7.7–27.6 kW for the same range. Manuals differ too: 120-183-A-R9 for the 29-106, 120-183-A-R11 for the 15-96.
IBC Technologies
The IBC DC 15-96 is the highest-efficiency model in the discontinued DC combi line: 96% AFUE, 15–96 MBH input, 14.5–85.9 MBH output, a 3.0 USgpm maximum DHW flow and 0.5 USG of vessel water.
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.
The DC 15-96, at 96% AFUE; the DC 29-106 is rated 94%.
About 8.4 MBH at the top end: 94.3 MBH versus 85.9 MBH CSA output.
DC I&O manual 120-183-A-R9; the 15-96 is covered by 120-183-A-R11.
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.