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Takagi · Series
The Takagi TCT-199 is a commercial condensing tankless water heater — not a boiler — rated 199,000 BTU/h input and 0.93–0.95 UEF in indoor and outdoor, natural-gas and propane models, with up to 10.0 GPM maximum flow and common-venting up to eight units.
Series facts
The TCT-199 is Takagi's commercial gas tankless water heater line: a condensing, on-demand water heater rated 199,000 BTU/h maximum input, 15,000 BTU/h (natural gas) or 13,000 BTU/h (propane) minimum input, and 0.93 UEF indoors / 0.95 outdoors. It is a water heater, not a boiler, and it is documented here because commercial hydronic plants often pair tankless water heaters with heating boilers for domestic hot water.
The line has four models: TCT-199I-N and TCT-199I-P (indoor) and TCT-199O-N and TCT-199O-P (outdoor). All four deliver up to 10 GPM maximum flow, connect on 3/4" NPT hot/cold water lines and 3/4" NPT gas, and share the same cabinet footprint of 23-5/8" H × 17-3/4" W × 11-1/4" D, with approximate shipping weights of 71 lb (indoor) and 69 lb (outdoor) per the official spec sheet.
The spec sheet prints an ANSI Z21.10.3 / CSA 4.3 listing, Ultra-Low NOx compliance, a primary commercial-grade copper heat exchanger with a Type 316L stainless-steel secondary exchanger, and a 6-year limited commercial heat-exchanger warranty with 5-year parts coverage. Indoor models ship with an integrated temperature controller and advanced diagnostics; outdoor models ship with a wall-mount remote controller.
The official spec sheet header uses the commercial name 'CT-199' while the model table prints the TCT-199I/O model numbers. No Canadian statement appears on the captured pages, so Canadian availability is recorded as unknown.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Takagi
The Takagi TCT-199I-N is the natural gas indoor 199,000 BTU/h condensing tankless water heater in the TCT-199 Commercial Series — a DHW-only appliance, not a boiler, rated 0.93 UEF with up to 10 GPM maximum flow.
Takagi
The Takagi TCT-199I-P is the propane indoor 199,000 BTU/h condensing tankless water heater in the TCT-199 Commercial Series — a DHW-only appliance, not a boiler, rated 0.93 UEF with up to 10 GPM maximum flow.
Takagi
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.
Takagi
The Takagi TCT-199O-P is the propane 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.
| Specification | Takagi TCT-199I-N | Takagi TCT-199I-P | Takagi TCT-199O-N | Takagi TCT-199O-P |
|---|---|---|---|---|
| Input, minimum | 15,000 BTU/h | 13,000 BTU/h | 15,000 BTU/h | 13,000 BTU/h |
| Input, maximum | 199,000 BTU/h | 199,000 BTU/h | 199,000 BTU/h | 199,000 BTU/h |
| output-max | — | — | — | — |
| afue | — | — | — | — |
| turndown | — | — | — | — |
| vent-max-3 | — | — | — | — |
| vent-max-2 | — | — | — | — |
| weight | — | — | — | — |
Read the full comparison: Takagi TCT-199I-N vs TCT-199O-N →
Read the full comparison: Takagi TCT-199I-N vs Takagi TCT-199I-P →
Read the full comparison: Takagi TCT-199I-P vs Takagi TCT-199O-N →
Read the full comparison: Takagi TCT-199O-N vs Takagi TCT-199O-P →
Error codes and alerts
No alerts documented for this series yet.
Manuals
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.
Services for Takagi boilers
No. The TCT-199 is a commercial condensing tankless water heater that heats domestic water on demand. It is not a boiler and does not heat buildings directly.
I is the indoor model, shipped with an integrated temperature controller; O is the outdoor model, shipped with a wall-mount remote controller. Both are rated 199,000 BTU/h maximum input and up to 10 GPM.
The official spec sheet prints 3" PVC venting up to 70 feet or 4" PVC venting up to 100 feet, with common venting up to eight units and Easy-Link/Multi-Link manifold options for more.
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
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.