Can’t be sure why the installers won’t install units from Home Depot. Could be purely financial. Ask them if they would install ones from Lowe’s.
“Thank you for contacting Rheem. The difference between the Professional series and the Performance series is simply where they are sold through. The Performance line is carried by Home Depot, for which we provide them with an exclusive model number. The Professional line is sold through the local plumbing supply companies to the contractors that install them for customers, again with exclusive model numbers. The quality of the tank that stores the water, regardless the warranty period, are all the same - meaning even the 6-year warrantied water heaters have the potential to last as long as the 12-year models.Thank you BlueSkyHigh.
The two who only install Bradford White tried to tell me the water heaters from Home Depot are not good quality, especially the brand name Rheem. However I found a third plumber, he only installs Rheem. Between the two brand names, Is one really better than the other? Could someone advise? Thanks.