T-H3S-OS-N Outdoor Tankless High Efficiency Condensing Water Heater (NG)

The Takagi brand has been discontinued by the manufacturer as of December 31, 2025. Suggested replacement units will be available on our website and replacement parts will continue to be available as supplies last. If you'd like any further assistance, please contact our customer service team.

Rebates:
You may be eligible for rebates from your local utility company and state. Search your zip code in the link below for information about rebate programs that apply to you.Takagi Rebate Center

Note: Isolation valves are not included but are recommended for installation.

The all new T-H3S-DV/OS is available in 2 models the T-H3S-DV (Indoor) and the T-H3S-OS (Outdoor) having a max GPM is 8.0. Also offers Ultra-Low Nox condensing technology which provides 0.95 energy factor. Try the new T-H3S-DV/OS and see why Takagi offers the highest efficient and durable commercial tankless heaters on the market.

The primary heat exchanger is constructed of HRS35 Commercial-Grade copper which is more resilient against erosion. In addition to the added durability, the T-H3S-DV/OS is ENERGY STAR® qualified. Indoor model includes a built-in temperature controller and diagnostics while the outdoor model includes a temperature remote controller.

This unit is NOT approved for installation in Manufacture Homes and is not suitable for space heating applications only.

Ultra-Low NOx Condensing Technology Provides

Significant Energy Cost Savings - Unprecedented 0.95 Energy Factor

ENERGY STAR® Qualified

Durable HRS35 Commercial-Grade Copper Primary Heat Exchanger

Type 316L Stainless Steel Secondary Heat Exchanger

Electronic Ignition - No Pilot Light

Indoor Model has Built-in Temperature Controller and Diagnostics

Outdoor Model has Temperature Controller and Diagnostics Included

Factory-Installed Power Cord Included for Indoor Models

Complies with Lead Free Standards

Suitable for Commercial Application (T-H3 Models)

Easy-Link up to 4 Units with no Additional Parts or Accessories Needed (T-H3 Models)

Multi-Link up to 20 Units (T-H3 models only)

Internal Freeze Protection System

Power Direct Vent Design Provides Flexible

Venting with PVC, CPVC or ABS

TM-RE40 Remote Control is included:

• TK-RE40 Remote Control