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 HC 13-50 and HC 23-84 are the two smallest HC heating boilers. The 23-84 roughly doubles the input ceiling (84 vs 51 MBH) and output (74.8 vs 45.4 MBH) at the same 94% AFUE, adding 1 lb of weight and keeping the same flows, vessel and venting.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | IBC HC 13-50 | IBC HC 23-84 |
|---|---|---|
| Input, minimum | 13.5 MBH | 23 MBH |
| Input, maximum | 51 MBH | 84 MBH |
| CSA output, minimum | 12.4 MBH | 21.2 MBH |
| CSA output, maximum | 45.4 MBH | 74.8 MBH |
| Efficiency (AFUE) | 94 % | 94 % |
| Power use at full fire (internal pump) | 126 W | 126 W |
| Weight (empty) | 84 lb | 85 lb |
| Pressure vessel water content | 0.37 USG / 1.4 L | 0.37 USG / 1.4 L |
| Maximum boiler flow rate | 9 USgpm | 9 USgpm |
| Minimum boiler flow rate | 2 USgpm | 2 USgpm |
| 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 heating-only wall-hung boilers with no DHW coil: the 13-50 covers 13.5–51 MBH input (3.95–14.94 kW) and 12.4–45.4 MBH output (3.64–13.3 kW), while the 23-84 covers 23–84 MBH input (6.7–24.9 kW) and 21.2–74.8 MBH output (6.2–21.9 kW). Both are rated 94% AFUE.
The published common rows are identical: 43.5 psig maximum space-heating pressure with a supplied 30 psig relief valve, 5–14" w.c. gas, 50–194°F water, 12,000 ft altitude, 120 ft of 3" / 35 ft of 2" venting per side, 9 USgpm maximum and 2 USgpm minimum flow, and 0.37 USG (1.4 L) of vessel water.
The only physical difference is weight — 84 lb (38 kg) on the 13-50 versus 85 lb (39 kg) on the 23-84 — and the power draw, 126 W at full fire on both. Manuals differ: 120-185-A-R10 for the 13-50, 120-185-A-R9 for the 23-84. Both are discontinued.
IBC Technologies
The IBC HC 13-50 is the smallest HC Series heating boiler: 13.5–51 MBH input, 12.4–45.4 MBH output at 94% AFUE, 84 lb, and 120 ft of 3" venting per side. It is heating-only.
IBC Technologies
The IBC HC 23-84 is a discontinued heating-only boiler rated 23–84 MBH input and 21.2–74.8 MBH output at 94% AFUE, sharing the DC 23-84's ratings on the heating side without the DHW coil.
The HC 13-50, from 13.5 MBH (3.95 kW); the HC 23-84 starts at 23 MBH (6.7 kW).
No. The 13-50 is covered by 120-185-A-R10 and the 23-84 by 120-185-A-R9.
Yes: 9 USgpm maximum and 2 USgpm minimum on both, per the HC specification table.
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.