Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The SFC 99-1 and SFC 125-1 are the two smallest SFC combis with identical 85 lb weight, venting and heating-side limits — but the 125 fires to 125 MBH for domestic hot water against the 99's 99 MBH, delivering about 3.2 GPM versus 2.4 GPM, at the cost of a 95% AFUE rating versus 96%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | IBC SFC 99-1 Superflow | IBC SFC 125-1 Superflow |
|---|---|---|
| Heating input, minimum | 15.5 MBH | 16.5 MBH |
| Heating input, maximum | 99 MBH | 99 MBH |
| DHW input, maximum | 99 MBH | 125 MBH |
| CSA output, maximum | 89 MBH | 89 MBH |
| Efficiency (AFUE) | 96 % | 95 % |
| Weight (empty) | 85 lb | 85 lb |
| Max. equivalent vent length, 2" | 65 ft | 65 ft |
| Max. equivalent vent length, 3" | 120 ft | 120 ft |
| Max. DHW flow rate | 4 GPM | 4 GPM |
| Gas connection | 3/4" NPT | 3/4" NPT |
Both SFC models share the same wall-hung chassis, the same 2" (65 ft) and 3" (120 ft) venting, the same 43.5 psig heating-coil rating and the same 85 lb weight. The space-heating input is capped at 99 MBH on both, so the difference is entirely in the hot-water side.
The SFC 125-1 raises the DHW input from 99 to 125 MBH and its continuous delivery from 2.4 GPM (at a 70°F rise, per IBC) to 3.2 GPM (at a 67°F rise). That extra hot-water headroom is the reason to choose it in a household with more or larger draws.
The trade-off is efficiency: IBC rates the SFC 99-1 at 96% AFUE and the SFC 125-1 at 95%. Neither difference is large enough to decide on its own — hot-water demand and the heat-loss calculation should drive the choice.
IBC Technologies
The IBC SFC 99-1 is the smallest Superflow SFC combi boiler: up to 99 MBH input for space heating and DHW, 96% AFUE, wall-hung, with 2" or 3" PVC/CPVC/PPs venting. It is a fit for townhouses and smaller homes wanting one appliance for heat and hot water.
IBC Technologies
The IBC SFC 125-1 Superflow is a wall-hung condensing combi boiler rated 95% AFUE: up to 99 MBH for space heating and 125 MBH for domestic hot water, with 3.2 GPM continuous DHW delivery at a 67°F rise.
Effectively yes: IBC caps space heating at 99 MBH input on both models. The SFC 125-1's extra input is reserved for domestic hot water.
IBC publishes 2.4 GPM continuous at a 70°F rise for the SFC 99-1 and 3.2 GPM at a 67°F rise for the SFC 125-1, with the same 4 GPM maximum DHW flow on both.
IBC rates the SFC 99-1 at 96% AFUE and the SFC 125-1 at 95% AFUE. The percentage difference is minor compared with matching the boiler to the home's loads.
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 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.