Triangle Tube Instinct 199C (floor combi)
The Instinct 199C floor combi (INSFS199C) is the largest Instinct appliance: 24.875 to 199 MBH at 95% AFUE with 5.3 GPM of DHW at a 70°F rise in a 191 lb floor cabinet. Discontinued with the November 3, 2025 cessation.
Key figures
- Max input
- 199 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 24.875 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Triangle Tube Instinct 199C (floor combi) in practice
The INSFS199C tops the entire Instinct line: 24,875 to 199,000 BTU/h at 95% AFUE with an 8:1 turndown, 184 MBH DOE capacity and a 159 MBH net AHRI rating, combined with the combi plate heat exchanger's 5.3 GPM DHW delivery at a 70°F rise — the same performance as the wall 199C in a floor package.
The floor cabinet measures 22" x 41" x 22" and weighs 191 lb, connecting on 1" MNPT supply/return (1 1/4" FPT with the 548 Caleffi Separator) with a 3/4" MNPT gas connection and 3" venting to 100 ft. The DHW side publishes a 150 °F maximum flow temperature, 0.5 GPM minimum flow and 150 psi maximum operating pressure. Triangle Tube ceased operations November 3, 2025; this model is documented for the installed base.
Best suited to
- Larger homes and small buildings wanting the biggest Instinct combi on the floor
- Households needing the 199-class heating range and 5.3 GPM DHW at 70°F
- Basement plants where a 191 lb unit can sit on a solid floor
Applicability and support
- Model number
- INSFS199C
- Canadian availability
- historical
- Production status
- discontinued
- 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 Triangle Tube. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Heating input, minimum | 24.875 MBH | 24,875 to 199,000 BTU/h as printed. |
| Heating input, maximum | 199 MBH | 24,875 to 199,000 BTU/h as printed. |
| Output | ||
| DOE heating capacity | 184 MBH | Per the product-page spec table. |
| Net AHRI rating | 159 MBH | Per the product-page spec table. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95% AFUE per the product-page spec table. |
| Domestic hot water | ||
| Maximum DHW flow temperature | 150 °F (65 °C) | Per the product page. |
| DHW output at 70°F rise | 5.3 GPM | Performance identical to the wall combi per the product page. |
| DHW minimum flow | 0.5 GPM | |
| DHW maximum operating pressure | 150 psi | |
| Venting and air | ||
| Vent/air diameter | 3" connection; 3-in-1 adapter accepts PVC, polypropylene or stainless steel | Per the product-page spec table. |
| Maximum vent length, 3" | 100 ft | Per the product page and vent supplement 241576. |
| Physical and connections | ||
| Weight | 191 lb | |
| Width | 22 in | |
| Height | 41 in | |
| Depth | 22 in | |
| Supply/return connections | 1" MNPT | 1 1/4" FPT when using the 548 Caleffi Separator, per the product-page footnote. |
| Gas connection | 3/4" MNPT | |
| Operating limits and other | ||
| Fuel | Natural gas or propane | |
| Turndown ratio | 8:1 | |
| Maximum CH flow temperature | 185 °F | Per the product page. |
Manuals
- Instinct Floor (FSB) Installation & Maintenance Manual — Solo 110-155-199 & Combi 155-199242194 Rev. A02 · 2025-09
Alerts documented for this model
Frequently asked questions
What is the largest Instinct combi available?
The 199C is the largest, in both wall (INS199C, 130 lb) and floor (INSFS199C, 191 lb) forms, firing 24,875 to 199,000 BTU/h with 5.3 GPM of DHW output at a 70°F rise.
Does the floor 199C vent in 2" pipe?
No. The floor and wall combi pages print only a 3" maximum vent run of 100 ft for the combis, with no 2" allowance listed; the vent supplement 241576 is the sizing authority.
Questions about the Triangle Tube Instinct 199C (floor combi)?
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.
Compare and explore
- Triangle Tube Instinct 110S (wall)Same series
- Triangle Tube Instinct 155S (wall)Same series
- Triangle Tube Instinct 199S (wall)Same series
- Triangle Tube Instinct 110S (floor)Same series
- Triangle Tube Instinct 155S (floor)Same series
- Triangle Tube Instinct 199S (floor)Same series
- Triangle Tube Instinct 155C (wall combi)Same series
- Triangle Tube Instinct 199C (wall combi)Same series
- Triangle Tube Instinct 155C (floor combi)Same series
- Instinct series hub
- Buying guide
Sources and verification
- Instinct Floor Installation & Maintenance Manual, 242194 Rev. A02 (09/2025) · accessed September 7, 2026
- Instinct Wall & Floor Vent Supplement, 241576 Rev. A02 (09/2025) · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.