IBC Technologies · SL Series G3
IBC SL 20-160 G3
The IBC SL 20-160 G3 is the 160 MBH member of the SL Series G3: a wall-hung, 95% AFUE condensing boiler for natural gas or propane, bridging the 115 and 199 models for homes with higher heat loss or hot-water loads.
Key figures
- Max input
- 160 MBH
- Max CSA output
- 147 MBH
- AFUE
- 95 %
- Min input
- 20 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
IBC SL 20-160 G3 in practice
The SL 20-160 G3 fires from 20 to 160 MBH input with a CSA output of up to 147 MBH, which places it between the 115 and the 199 in the SL G3 range. Homes that exceed the 115's output on design days, or that add a large indirect tank with fast recovery, are the usual reasons this size is chosen.
Like the rest of the SL G3 series it is heating-only, with IBC documenting a direct connection to an indirect tank for domestic hot water. The 160 also keeps the 1" water connections and 85-pound-class wall mounting shared with the smaller models, while adding 17 lb over the 115.
Venting differs from the two smaller models: a maximum of 170 equivalent feet in 3" and only 35 feet if 2" is used, against 240/100 feet on the 85 and 115. The vent route therefore matters more on this model, and the equivalent-length calculation should be done early in planning.
Best suited to
- Larger detached homes whose heat-loss calculation exceeds the 115's output
- Homes pairing the boiler with a large indirect tank for hot-water recovery
- Buildings where the installer can run 3" venting within 170 equivalent feet
Applicability and support
- Model number
- SL 20-160G3
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by IBC Technologies. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, minimum | 20 MBH | 5.86 kW |
| Input, maximum | 160 MBH | 46.9 kW per IBC model page; the Canadian brochure prints 46.7 kW. |
| Output | ||
| CSA output, minimum | 19 MBH | 5.57 kW |
| CSA output, maximum | 147 MBH | 43.1 kW. DOE heating capacity is not published on the IBC pages we cite. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | Annual fuel utilization efficiency as published by IBC. |
| Domestic hot water | ||
| Domestic hot water | Not a combi; indirect tank connects directly to the boiler | |
| Venting and air | ||
| Flue material | 3" Schedule 40 or 3" PPs (80 mm) | |
| Max. equivalent vent length, 3" | 170 ft | Each side; see the installation manual for the equivalent-length method. |
| Max. equivalent vent length, 2" | 35 ft | |
| Air intake | Direct vent or indoor supply | |
| Physical and connections | ||
| Weight (empty) | 102 lb | 46.3 kg |
| Water connections | 1" NPT | |
| Gas connection | 1/2" NPT | |
| Condensate connection | 3/4" hose | |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Conversion kit included per IBC model page. |
| Turndown ratio | up to 8:1 | IBC model page figure. The Canadian brochure headline says up to 10:1. |
| Gas supply pressure | 4 – 14 in. w.c. | |
| Max. operating pressure | 30 psig | |
| Max. water temperature | 190 °F | Electronic limit. |
| Altitude rating | 0 – 12,000 ft | |
Manuals
- Installation & Operating Manual — SL G3 residential, doc 120-276E13120-276E13 · 2026-08-11
- SL Series G3 Brochure (Canada)900-041 R8 · 2019-05-29
Alerts documented for this model
- Error – Ignition trials exceeded
- Error – Water High-Limit
- Error – Low Water Cutoff
- Error: Interlock [1 or 2] Open
- Error: Vent High Limit
- Error – Max. delta T Exceeded
- Error – Low RPM / Air Flow
- Error – Fan Pressure
- Error – Module High Current
- Error – Low Module Current
- Error – Low Water Pressure
- Error – Inlet Pres. Sensor
- Error – See: Status > SIM menu > Status
- Error – Roll Out Switch
- Error – Controller Board
- Error – No Boilernet Comm
- Error – No MAC address
- Error – Flame Signal / Vent Block
- Error – Reversed Flow
- Error – Temp. probe error
- Error – Unhandled error code
- Outlet Limited
- Remote offline
- Unoccupied
- Summer
- Failsafe Setpoint
Frequently asked questions
Can the SL 20-160 G3 be vented in 2" pipe?
IBC allows 2" venting on this model up to 35 equivalent feet per side. Beyond that the installation must use 3", which is allowed to 170 equivalent feet per side.
How heavy is the SL 20-160 G3?
IBC publishes an empty weight of 102 lb (46.3 kg), so the mounting wall and the lifting plan differ from the 85 lb smaller models.
Is the SL 20-160 G3 available in Canada?
Yes. It is listed on IBC's Canadian model page and in the Canadian SL G3 brochure. Whether ROMA supplies it for your project is confirmed at consultation.
Questions about the IBC SL 20-160 G3?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- IBC SL 20-160G3 — model page · accessed September 7, 2026
- SL Series G3 Brochure (Canada), spec table · 900-041 R8 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.