Our most popular models are from the 125 Series. These tankless water heaters supply one major hot water outlet at a time (Example: One shower running at a time). They are sized for most homes and small businesses and have a 12-year warranty when installed professionally.

125BO (Outdoor)
Bosch AquaStar Model 125BO is for installation outdoors and has built-in freeze protection down to 5°F. It’s tough enough to crank out endless hot water for all your household needs – on demand, instantly. So efficient, it saves up to 50% in energy costs.

125FX
Built-in power vent which allows horizontal venting up to 15'. Also has an electronic ignition and a horizontal vent terminator accessory.

NOTE: For Massachusetts Residences considering purchasing and installing the 125FX, please read this document: Sidewall Venting Information for Commonwealth of Massachusetts [PDF].