Check the listing for details. Bosch AquaStar Tankless Water Heater Model 250SX Natural Gas Unit. Condition: For parts or not working. Listed at 295.00 USD. Bosch AquaStar 250SX Tankless Water heater. Whole house model. 175,000 BTU Natural Gas. This is a complete unit but currently not working. It was functioning perfectly until we had out furnace replaced and then the water heater started throwing an EA code. Could have been something with an interruption of the gas flow. We had new electrodes installed but it did not correct the problem for us and that's as far as our tech savvy goes. It may be a simple fix if you know what you are doing otherwise use it for parts. Includes original user manual and one (1) 24" stainless steel 3" vent pipe. Cost of shipping depends on your location. If ibterested, we can confirm shipping cost before you bid. Free pick up in Los Angeles.