Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The DC 23-84 and DC 15-95 are adjacent discontinued DC combis. The 15-95 fires lower (15 vs 23 MBH minimum) and slightly higher (95 vs 84 MBH), adds one point of AFUE (95% vs 94%), allows 3.0 vs 2.6 USgpm of DHW flow, and weighs 97 lb against the 23-84's 85 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | IBC DC 23-84 | IBC DC 15-95 |
|---|---|---|
| Input, minimum | 23 MBH | 15 MBH |
| Input, maximum | 84 MBH | 95 MBH |
| CSA output, minimum | 21.2 MBH | 14.4 MBH |
| CSA output, maximum | 74.8 MBH | 85.5 MBH |
| Efficiency (AFUE) | 94 % | 95 % |
| DHW input | 23 – 84 MBH | 15 – 95 MBH |
| Max. DHW flow rate | 2.6 USgpm | 3 USgpm |
| Power use at full fire (internal pump) | 126 W | 128 W |
| Weight (empty) | 85 lb | 97 lb |
| Pressure vessel water content | 0.37 USG / 1.4 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 |
Both are wall-hung combination boilers with the same coil ratings (43.5 psig space heating, 150 psig DHW), the same 5–14" w.c. gas supply, the same 12,000 ft altitude approval and the same 120 ft of 3" / 35 ft of 2" venting per side. The 23-84's output range is 21.2–74.8 MBH; the 15-95's is 14.4–85.5 MBH.
The 15-95's lower minimum input and higher maximum output come with a higher AFUE, 95% against the 23-84's 94%. On the DHW side the 15-95 allows 3.0 USgpm maximum flow versus 2.6 USgpm on the 23-84, with the same 0.5 USgpm activation threshold.
Weight and manuals split the pair: the 23-84 is 85 lb (39 kg) and covered by I&O manual 120-183-A-R9, while the 15-95 is 97 lb (44 kg) and covered by 120-183-A-R11. The DC Series is discontinued, so both records exist for identification and service rather than new selection.
IBC Technologies
The IBC DC 23-84 is the smallest discontinued DC combi: 23–84 MBH input, 21.2–74.8 MBH output, 94% AFUE and a 2.6 USgpm maximum DHW flow, with 120 ft of 3" venting per side.
IBC Technologies
The IBC DC 15-95 is a discontinued DC combi rated 15–95 MBH input and 14.4–85.5 MBH output at 95% AFUE, with a 3.0 USgpm maximum DHW flow and 120 ft of 3" venting per side.
The DC 15-95, at 15 MBH (4.4 kW) against the DC 23-84's 23 MBH (6.7 kW).
No. The 23-84 is covered by 120-183-A-R9 and the 15-95 by 120-183-A-R11.
The DC 15-95, at 3.0 USgpm maximum against 2.6 USgpm on the DC 23-84.
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.