Takagi · TCT-199 Commercial Series
Takagi TCT-199O-N
The Takagi TCT-199O-N is the natural gas outdoor 199,000 BTU/h condensing tankless water heater in the TCT-199 Commercial Series — a DHW-only appliance, not a boiler, rated 0.95 UEF with up to 10 GPM maximum flow.
Key figures
- Max input
- 199,000 BTU/h
- Max CSA output
- —
- AFUE
- —
- Min input
- 15,000 BTU/h
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Takagi TCT-199O-N in practice
Per Takagi's official specification sheet (TCGSS00117), the TCT-199O-N fires from 15,000 to 199,000 BTU/h on natural gas, is rated 0.95 UEF, and delivers up to 10 GPM maximum flow. It connects on 3/4" NPT hot/cold water lines and a 3/4" NPT gas line, measures 23-5/8 × 17-3/4 × 11-1/4 in and has an approximate shipping weight of 69 lb.
The TCT-199O-N is an outdoor model with a commercial-grade copper primary heat exchanger and a Type 316L stainless-steel secondary exchanger, Ultra-Low NOx combustion below 14 ng/J (< 20 ppm), and an outdoor configuration that vents directly. It ships with an integrated temperature controller on indoor models and a wall-mount remote controller on outdoor models.
The TCT-199 is a commercial water heater for domestic hot water; it is not a boiler. Sizing, venting design, gas-supply capacity and any hydronic or recirculation integration are engineering decisions that belong with a licensed contractor following the current installation manual and local code; Boilers.ca reproduces Takagi's printed figures and does not size appliances from floor area.
Best suited to
- Outdoor domestic hot-water service at up to 199,000 BTU/h input
- Projects needing 0.95 UEF condensing efficiency with Ultra-Low NOx combustion
- Manifolded systems: Easy-Link up to 4 units, or Multi-Link up to 20 with a controller
Applicability and support
- Model number
- TCT-199O-N
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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 Takagi. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, maximum | 199,000 BTU/h | As printed in Takagi specification sheet TCGSS00117. |
| Input, minimum | 15,000 BTU/h | As printed in Takagi specification sheet TCGSS00117. |
| Efficiency | ||
| Uniform Energy Factor (UEF) | 0.95 UEF | 0.95 UEF as printed in Takagi specification sheet TCGSS00117. |
| Domestic hot water | ||
| Maximum flow rate | 10 GPM | Factory-tested maximum; 0.4 GPM required for continuous fire after ignition. |
| Physical and connections | ||
| Hot/cold water connections | 3/4" NPT | |
| Gas connection | 3/4" NPT | |
| Dimensions (H × W × D) | 23-5/8 × 17-3/4 × 11-1/4 in | |
| Approx. shipping weight | 69 lb | |
| Heat exchanger | Commercial-grade copper primary + Type 316L stainless-steel secondary | |
| Operating limits and other | ||
| Installation | Outdoor | |
| Technology | Condensing tankless water heater | |
| NOx | Ultra-Low NOx < 14 ng/J (< 20 ppm) | |
| Manifold capability | Easy-Link up to 4 units; Multi-Link up to 20 units with controller | |
| Warranty | 15-yr limited HX / 5-yr parts residential; 5-yr HX / 5-yr parts commercial | As printed by Takagi for the T-H3 family; TCT-199 commercial warranty is 6-yr HX / 5-yr parts. |
Alerts documented for this model
None documented yet.
Frequently asked questions
Is the Takagi TCT-199O-N a boiler?
No. It is a condensing tankless water heater (DHW-only). Takagi's catalogue contains no boiler line; where the T-H3 family is used with hydronic or radiant systems, the appliance is still a water heater and the system must be designed by a licensed contractor.
What is the input range of the TCT-199O-N?
Takagi's specification sheet prints 15,000 BTU/h minimum and 199,000 BTU/h maximum input on natural gas, with up to 10 GPM maximum flow and 0.95 UEF.
Can the TCT-199O-N be used for space heating?
The TCT-199 is positioned as a commercial domestic-hot-water heater. Takagi's captured pages do not document it for space heating; use it for domestic hot water and keep space heating on a boiler.
Questions about the Takagi TCT-199O-N?
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
- Takagi — TCT-199o-n product page · accessed September 9, 2026
- Takagi — TCT-199 Commercial Gas Tankless Water Heater Specification Sheet · TCGSS00117 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.