Bosch Greentherm T9800


✓ Space-saving, state-of-the-art tankless design.
✓ Up to 0.99EF.
✓ Endless hot water.
✓ No cold water sandwich effect.
✓ Ability to control external pumps
✓ Integrated freeze protection
✓ Lower energy bills.
✓ 15-year warranty dual stainless steel heat exchangers




Continuous Hot Water, Invisible Comfort

The Greentherm 9000 Series brings homeowners more than endless hot water. It saves time, money, space and unnecessary stress.

An ideal solution for energy efficient hot water

The Greentherm 9000 offers an efficiency rating of greater than .99 thermal efficiency, among the highest energy efficiency available on the market today, 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 9000 series indoor models were specifically designed with top connection 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, hardworking

All Greentherm 9000 Series models feature sleek, rounded corners on the metal cabinet, making these water heaters as beautiful as they are energy-efficient.

Innovation Award Honoree

* Named CES 2017 Innovation Award Honoree. The prestigious CES Innovation Awards are sponsored by the Consumer Technology Association™. CES Innovation Awards celebrate outstanding product design and engineering in brand-new consumer technology products.