This is the place for troubleshooting problems with your gas tankless water heater.
Easily identify and troubleshoot your issues with our parts diagrams PDFs.
Technical Support Form
This form is set up for users who have already tried all troubleshooting and still are in need technical support.
AquaStar Technical Support
2700ES, 2400ES, 2400E, 1600 series, 1000P, 250, 240FX, 125 series, & VP
Bosch geothermal, gas-fired Greenstar condensing boilers, Greentherm tankless water heaters, solar products and point-of-use downloads
Discontinued Bosch Products
Geothermal, Therm/Gas Tankless, Mini Tank & Electric Water Heaters