The Amtrol 2704-392 Z-Control Retrofit Kit is a replacement control upgrade designed for compatible Amtrol BoilerMate indirect-fired water heaters, including WH-7L, WH-7P, WH-7C, TD-7L, TD-7P, and TD-41L models. This retrofit kit replaces outdated control components and restores accurate temperature regulation for reliable hot water production. By monitoring and controlling water temp... https://www.partshnc.com/2704-392-amtrol-z-control-retrofit-kit-for-wh-7l-7p-7c-td-7l-td-7p-td-41l