Bosch Thermotechnology Tronic 4000 Electric Tankless Water Heater, 8.5 kW, White

I have installed this water heater little over 2 months. It replaced my previous heater Bosch AE12. My heater is located on the wall in boiler room and supply hot water into neighboring bathroom and kitchen. I had it installed by licensed plumber. In my case, the installation was not difficult. There are three settings for hot water temperature. It delivers sufficient amount of hot water. So far, so good. My previous Bosch unit lasted 8 years, hopefully this will be working for longer time too.

Update: this unit started leaking inside the unit. I attached a photo of the leak location. This is 3 months after installation. Do not recommend this unit at all.This water heater doesn’t heat quickly for some reason when you turn off the water, it completely starts over and takes about 30 seconds to start heating again. So if you leave the water on, it’s fine, but if you turn the water on and off and on again, you waste many gallons of water, waiting for it to reheat again.

This was pretty difficult to get installed. It also seems to have a typo on the heater ring, so we had to try to figure out which was actually low medium high and off. Only two of the positions actually work. This was replacing an earlier model which was the same brand that died after only 2 or 3 years. Not thrilled about it, but seems to be working okay.

The water warms up in less than 10 seconds. The slower the flow to hotter the water.

I wanted to use an economically-priced electric solution, from a name I trusted, to preserve my propane supply for emergency back-up. I tried a used one, for a great price, but sadly, it mysteriously stopped making hot water a week after I installed it. I decided to just take a refund, since I wasn't willing to buy new right now.

The water takes longer to heat and does not get as hot as the previous Bosch heater that I had. This unit has a larger kilowatt rating, but it does respond as the previous heated. Sometimes it will not heat at all, and I shut the water off and turn it back on to make the water heat - luke warm. I was wondering if I can get a replacement or a different brand. I currently have 3 other Bosch heaters and they work fine but this newer replacement heater is not as good. Wayne Welle

works like a charm

The unit started to leak water after 8 months. I reached out to Bosch customer service and they told me they would send me a reimbursement check. (The unit is still under warranty). No check arrived. After two weeks I followed up (email) and Bosch's customer service team became unresponsive. Wow, I can't believe a quality Brand like Bosch is treating customers like that. Makes me really think twice about buying this brand again.Update: I finally got a response when I called the customer support line. Looks like they had some internal communication issue. The Customer Service person I talked to was very competent and figured out the issue. Looks like a reimbursement check is on it's way.