Bosch Thermotechnology provides the warranty for all of its Bosch tankless water heaters, including gas, propane and electric tankless water heaters in addition to the electric mini-tank water heaters.
You can find the full details of these Bosch product warranties at: http://www.bosch-climate.us/support-center/product-warranty.html
At this link you will also find the Bosch warranties for their Geothermal Heat Pumps, Bosch Greenstar Boilers, Stainless Steel Storage Tanks, and Solar products.
The warranty is always provided by the manufacturer, so you can contact Bosch directly with any warranty questions. Bosch also provides the warranty for all of its replacement parts.
Call us at 866.289.4652 if your Bosch water heater, boiler, storage tank or replacement part are out of warranty and in need of replacement. We offer Next Day Air, Second Day Air, and Ground shipping options for all of our Bosch products.