Takagi T-H3-DV-N
Amazon customer rating as of
Tankless Geek editorial score: 4.6/5
The Takagi T-H3-DV-N is a flagship condensing gas tankless: 199,000 BTU/h, up to 10 GPM, and a 0.95 UEF, with a commercial-grade copper primary heat exchanger and a 316L stainless secondary. It's Ultra-Low NOx, certified to 10,100 feet of altitude, can be multi-linked (up to 4 units, or 20 in a manifold system), and carries a strong 15-year residential heat-exchanger warranty. As a genuinely high-capacity, high-efficiency unit built to commercial standards, it's one of the most capable residential gas tankless heaters made — able to run several fixtures at once even in cold climates.
The one thing every buyer must know: Takagi discontinued the brand as of December 31, 2025. Units are still sold new from retailer stock, existing warranties are honored (claims routed through Lake County Pipe rather than the factory), and replacement parts remain available while supplies last — but long-term parts availability will taper, and A.O. Smith now positions its own tankless line as the successor. That makes the T-H3-DV-N a strong buy for its performance and price today, with a real caveat about the years ahead. If long-term parts support is your priority, weigh a current-production equivalent; if you want proven capacity now and value the price on remaining stock, it delivers.
Key Features
Best Use Cases
Our Verdict
A top-tier condensing gas tankless — 10 GPM, 0.95 UEF, dual heat exchangers, and cold-climate capacity to spare. The decisive caveat is that Takagi discontinued the brand at the end of 2025: great performance and pricing on remaining stock, but plan for tapering long-term parts support. Buy for capability today with eyes open about the future.
Technical Specifications
| Input | 15,000–199,000 BTU/h (natural gas) |
|---|---|
| Max flow | Up to 10 GPM |
| Efficiency | 0.95 UEF, condensing; Ultra-Low NOx |
| Heat exchangers | Commercial-grade copper + 316L stainless secondary |
| Capability | Multi-link to 4 units (20 in a manifold); certified to 10,100 ft |
| Warranty | 15-yr HX (residential) / 5-yr parts |
Specifications verified against the linked source documents. See Sources below.
How much hot water you'll actually get
Usable flow drops as incoming water gets colder. Figures are calculated from rated output (199,000 BTU × 0.95 UEF) and labeled as such — not bench-tested by us.
| Temperature rise | Typical scenario | Usable flow |
|---|---|---|
| 35 °F | Warm climate (75 °F in → 110 °F) — capped at max | 10 GPM |
| 45 °F | Mild climate (65 °F in → 110 °F) | 8.4 GPM |
| 60 °F | Cool climate (50 °F in → 110 °F) | 6.3 GPM |
| 70 °F | Cold climate (40 °F in → 110 °F) | 5.4 GPM |
Usable flow at a 110 °F target: BTU × UEF ÷ (ΔF × 500), capped at the 10 GPM maximum (condensing, 0.95 UEF).
Pros
Cons
Buy it if…
- Large homes needing 10 GPM / multiple simultaneous fixtures
- Cold-climate whole-home use wanting high efficiency (0.95 UEF)
- High-altitude installs (certified to 10,100 ft)
- Buyers who value performance and current pricing over long-term brand support
Skip it if…
- Buyers who need assured long-term factory parts and support
- Small homes that won't use the 199,000 BTU capacity
- Anyone wanting a current-production brand with an active roadmap
Installation Requirements
Professional vs DIY
A whole-home condensing unit — gas, sealed venting, and condensate require a licensed installer.
Takagi as a brand is being discontinued (Dec 31, 2025) — confirm parts and warranty support before buying.
Gas and electrical work should be done by a licensed professional, and most installs require a permit and must meet local building codes — DIY work can void the manufacturer warranty. Always confirm the unit's own manual for exact clearances, venting, and sizing.
What owners report
Themes summarized from retailer customer feedback (4.5/5 Amazon customer rating, 78 ratings, as of 2026-08-23). These are owner opinions, not our own bench testing.
Owners report it comfortably runs multiple fixtures at once and keeps up in cold weather where smaller units fall short.
The 0.95 UEF and dual copper/stainless heat exchangers earn praise for efficiency and durability at commercial standards.
Buyers should factor in Takagi's end-of-2025 discontinuation: warranties are honored and parts remain for now, but long-term support will taper.
As a 199,000 BTU condensing unit, it needs proper gas sizing, venting, and a condensate drain — a job for a qualified installer.
Takagi T-H3-DV-N FAQ
Is Takagi still in business?+
Takagi discontinued the brand as of December 31, 2025. Units are still sold from retailer stock, existing warranties are honored (via Lake County Pipe), and parts remain available while supplies last — but plan for support to taper over time.
How much hot water can it deliver?+
Up to 10 GPM at a mild rise — several fixtures at once — and roughly 5.4 GPM even at a hard 70 °F winter rise, making it true whole-home, cold-climate capacity.
Can it be linked for more capacity?+
Yes — up to 4 units can be multi-linked, and manifold systems scale to 20 units for light-commercial demand.
Should I still buy a discontinued model?+
For performance and current pricing, it's excellent. If assured long-term factory parts matter most to you, compare a current-production condensing unit before deciding.
Product sources
Specifications verified 2026-08-23. Manufacturer documents are treated as the primary source for model specifications. Retailer pages are used only for customer ratings and owner-feedback themes.
- Takagi T-H3-DV-N — official product page (accessed 2026-08-23)
- T-H3-DV-N specs & dimensions — Ferguson (accessed 2026-08-23)
- Takagi warranty & brand support (accessed 2026-08-23)
Price range from leading retailers
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