Enjoy Energy Efficient Hot Water

The Greentherm T9900 SE 199 offers up to 199,000 BTUH at an efficiency rating of UEF up to 0.95 and innovative features for easy installation, operation and simple maintenance. You will enjoy an industry-leading 15-year warranty on the heat exchanger and a full 5-year limited warranty on parts.

Replacing a tank?

The Greentherm T9900 SE was specifically designed with top connections for water, integrated drain ports so isolation valves are not needed, and a unique integrated sensor technology that auto-calibrates, making the switch to tankless water heating quick and easy.

Beautiful and Hardworking

All Greentherm T9900 Series models feature sleek, rounded corners on the metal cabinet, making these water heaters as beautiful as they are energy-efficient.

Options for Everyone

Indoor models can be converted from natural gas (NG) to liquid propane (LPG), and flexible venting options keep installation simple.

* Check Applications Manual in the Downloads tab to confirm proper product selection.

** MUST be installed and serviced by an experienced professional to obtain factory support!