We have a Bosch tankless water heater, that was not working intermittently. We call Bosch and they asked that we call one of their local certified technicians. Of all the Bosch certified technicians GJ Stimmler was the only one within the right radius of service and were able to come. Andrew Stimmler, on the first visit came and opened up the heater to diagnose the problem and had to call Bosch to troubleshoot it. After 3 hours of troubleshooting he told me that after talking with Bosch, I needed to change some parts which he already told Bosch about, and I just had to call Bosch and pay for it, which I did right away. He closed up all the parts and I noticed that he didn't connect the water connection back to the unit, and when asked he just connected it back without any explanation and left.
Issue 1: After he left, I opened a faucet in the bathroom and the hot water heater started leaking all over!! When I called him back he didn't respond for a long time, and finally after sending a video of my leaking like a waterfall unit, he finally told me that while opening up the unit, the o-ring broke the seal, and tried to blame me for asking him to connect the water back on (even though he never explained to me in the first place why he wanted to leave the water disconnected or that he broke the o-ring seal during diagnosis). He refused to come back to fix the problem and just gave me instructions on how to disconnect the water from the unit and put a bucket underneath to collect the leaky water!! I had already paid him for 3 hours worth of work, and now I had a leaky unit with a bucket underneath!!! He refused to come back to fix it that day or day after, and said he would come only after the parts arrived.
Issue 2: After the parts arrived, we scheduled a day for him to come replace the faulty parts and fix the unit. He doesnt come himself but sends 2 of his employees, who arrive about 2 hrs late without as much as a courtesy call to inform me they were delayed or arriving late. Once they arrived they informed me that the parts that arrived were the wrong parts!!! Mind you, Andrew and Bosch made the call on what parts were ordered, and I just called in to pay for it. When I made a comment that, between Andrew Stimmler and Bosch they had to figure it out, and get the right parts, he said what I said was offensive and quit the job!! I had to call again to beg him to tell me what the right parts were so I could call Bosch to order and find some other plumber to fix this!! So, he basically caused my water heater to leak, didnt tell me about it, worked with Bosch to order the wrong parts and then quits because I had the audacity to call him out on his mistakes!! Now I am stuck because there is no other plumber who is knowledgeable of Bosch Tankless Heaters within my service area. I have to now look at options to replace my entire unit!!
Andrew Stimmler is a blight on any honest, hard-working plumber and please avoid him at all costs!!