Just had this hot water heater installed approximately 2 years ago. I’m not sure what is causing the corrosion. Also, the tenant said the water inside is way too hot and that it started about three weeks ago.
Plumbing – Does anyone know what has caused this corrosion on hot water heater
plumbing
Related Solutions
A few things to check;
Did you place the expansion tank on the cold water side?
Did you pressurize the expansion tank to the same pressure that the water line is at after the regulator?
Is the expansion tank size rated for the size of your hot water heater?
With brass connected to galvanised pipe you can get some galvanic corrosion. There is something called a dielectic union which I've never needed to use. That may help. You'll need to clean up the rust. That may require cutting out the rusted part or at least scraping it off.
Here's a picture that describes the dielectric union joint.
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Best Answer
The corrosion is being caused be a poor solder job. The joints are slowly leaking. Next time get a real plumber to do the job and don't call this company back. By the way, the discharge pipe for the T&P valve is to be run in a full pipe size not a reduced pipe or tubing as it looks like yours was installed. That in itself shows that the "butcher" that installed this water heater needs to find a different line of work. If by chance the installing company is a good and reputable company, call them back and show them work done by their employee and maybe they will re-do the installation for free or at a reduced rate.