Takagi offers 14 condensing water heaters models in the lineup we track. This page is the Takagi-specific cut of the broader Condensing Water Heaters water heaters category — same product class, narrowed to the Takagi catalog only.

About Takagi

<p>Of the brands serving the US water heaters market, Takagi carries unusual depth: multiple price tiers, multiple form factors, and a track record measured in decades. Founded in Japan, Takagi has earned its way into nearly every water heaters-buying conversation by combining catalog breadth with a service network that translates into real-world reliability. Below is the complete current catalog, structured by sub-type and price tier; the overview that follows orients you to where Takagi is strong, where competitors edge it out, and which specific Takagi model is right for your install.</p>...

For the complete Takagi lineup across all sub-types and capacities, see the Takagi Water Heaters hub.

Takagi Condensing Water Heaters models we track

Takagi T-H3-DV-N Indoor Condensing Tankless Water Heater (T-H3-DV-N) — 10 GPM Takagi condensing tankless. 15-year heat exchanger warranty.
Takagi T-K4-IN-NG Non-Condensing Tankless Water Heater (T-K4-IN-NG) — Long-standing Takagi T-K4 — non-condensing 8 GPM tankless.
Takagi T-H3-OS-N Outdoor Condensing Tankless Water Heater (T-H3-OS-N) — Outdoor variant of the T-H3 flagship — 10.0 GPM condensing tankless, weather-sealed cabinet for exterior wall-mount. No interior venting required. Common Southe...
Takagi T-D2-IN-NG Indoor Condensing Tankless Water Heater (T-D2-IN-NG) — T-D2-IN — newer-generation condensing tankless. 10.0 GPM, 199k BTU, PVC venting, 15-year heat exchanger warranty. Direct competitor to the T-H3 with updated con...
Takagi T-H3-DV-P Indoor Condensing Tankless Water Heater (Propane) (T-H3-DV-P) — Propane variant of the T-H3-DV flagship — 10.0 GPM condensing tankless for LP gas installs. Same chassis as the NG version with LP gas valve and orifice. Common...
Takagi T-D2-OS-NG Outdoor Condensing Tankless Water Heater (T-D2-OS-NG) — Outdoor variant of the T-D2 — 10.0 GPM condensing tankless for warm-climate exterior wall-mount. No venting required, freeze protection built in.
Takagi T-H3J-DV-N Junior Condensing Tankless Water Heater (T-H3J-DV-N) — Junior variant of the T-H3 — 7.0 GPM condensing tankless. Smaller flagship for 1-2 bath homes. PVC venting, 15-year heat exchanger warranty, lower upfront cost...
Takagi T-H1-DV-N Compact Condensing Tankless Water Heater (T-H1-DV-N) — T-H1 — compact condensing tankless. 6.6 GPM, 120k BTU. Entry-tier T-H series, sized for 1-2 bath homes. PVC venting, 15-year heat exchanger warranty. Lower upfr...

Other Condensing water heaters brands

If you're cross-shopping condensing water heaters beyond Takagi, the following brands also ship in this category:

About Condensing Water Heaters water heaters

Condensing water heaters extract additional heat from the flue gas before exhausting it — increasing UEF efficiency from typical 0.62–0.67 (atmospheric) up to 0.84–0.97 (condensing). The technology requires sealed-combustion 2-pipe PVC venting and a condensate drain (the recovered heat condenses water vapor from the flue gas, which must drain to a floor drain or condensate pump).

For typical 3–4 person households on natural gas:

Atmospheric gas tank (0.62 UEF): $280–$380/year operating
Condensing gas tank (0.84 UEF): $200–$280/year operating
Condensing gas tankless (0.96 UEF): $180–$260/year operating

Condensing tank vs atmospheric tank: $80–$120/year savings. Over a 12-year...

For the complete condensing buyer's guide (all brands, full comparison framework), see the Condensing Water Heaters category hub.

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