Features: Our water heater circuit board for SF-20F SF-25 SF-25F SF-30 SF-30F SF-35 SF-35F SF-42 SF-42F. This module board operates on a DC12V power supply, making it suitable for use in mobile residences such as car, RVs, or boats. The power source is commonly used and easy to connect and operate. The furnace fan control board is designed with a plugs and play concept, It features standardized interfaces and connector, simplifying the installation process. It comes with pre-wired connector that can be easily connected to the corresponding ports of the water heater system. This eliminates the need for complex wiring or additional modifications. This 521099 module board adopts high-quality materials and undergoes meticulous manufacturing processes. This ensures its durability and reliability, allowing it to operate for extended periods in various environmental conditions while minimizing the need for repairs or maintenance. Specifications: Component:PCB Size:Approx.10.4x7.8cm/4.09x3.07inch Part Number:521099 Package Includes: 1pcs Water Heater Circuit Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.