Brother messed up water heater installation

Also, I read online that improper water heater installation can ruin the system

My brother Carlos really likes to think of himself as a handyman. Sadly, my brother is terrible when it comes to repairs, service and installation. I just don’t have the heart to crush my brother’s dreams. I usually try to hide if I have some home improvement thing going on. Unfortunately my brother got wind that I was getting a water heater installed in my home. My brother got me to cancel the professional plumber and installed the water heater for me. Water heater looks really great and I thought he did the installation right. Carlos definitely has messed up though since the water coming out of the faucets is scalding. The water literally is steaming in my house. The toilet water is hot enough to create a fog, the shower can’t be used and washing your hands is lethal. I thought maybe the temperature gauge was messed up. No, the temperature on the device seems to be normal. I don’t even know what my brother did to make the water heater aggressively heat, but I need to get it fixed. The issue is that now I need to call a plumbing business and get them into my house without my brother knowing. I don’t want him to feel bad that he did not do the job right. Also, I read online that improper water heater installation can ruin the system. I might be in for a major plumbing repair because he thought he was helping me out. I am trying to get my husband to take my brother out golfing or something so I can sneak a plumber inside.

Water heater repair