1PCS SF803 Water Heater Boiler TemperatureController Heating Purpose A singleunit temperature controller designed for water heater and boiler heating systems. The SF803 regulates heating operation by monitoring temperature and activating the heater to maintain the chosen set point. Key benefits Consistent temperature control that reduces temperature swings and prevents unnecessary cycling of the heater. Simple replacement or upgrade option for systems that use an external temperature controller with the SF803 form factor. Compact, singlepiece design for straightforward installation and minimal cabinet space impact. Durable enclosure and reliable switching suitable for routine residential and light commercial heating use. What it does Monitors the system temperature and switches the heating circuit on or off to hold the selected temperature. Provides a focused, singlefunction solution for managing boiler and water heater heating cycles. Compatibility Intended for use with water heaters and boiler heating systems that accept an external temperature controller in the SF803 format. Suitable for residential hot water tanks, small boiler systems, and equipment that uses a separate controller to manage heating elements or burners. Use with systems that match the controller wiring and electrical specifications of the SF803 model. Physical attributes and materials Singlepiece controller unit sized to fit standard controller mounting arrangements. Robust housing constructed for routine mechanical protection in heating equipment panels. Connections designed for secure electrical wiring to heating control circuits. Performance and reliability Built to deliver stable control of heating operation when installed correctly in compatible systems. Engineered for consistent switching performance during normal operation of water heaters and boilers. Typical use scenarios Home water heater replacement: Swap an existing controller with the SF803 to restore reliable temperature control in a household hot water tank. Small boiler temperature control: Use the SF803 to manage the heating cycle of a small commercial or residential boiler, maintaining set temperatures for hot water or space heating loops. Workshop or utility tank heating: Apply the controller to heating elements in process tanks or utility hot water systems that require straightforward temperature regulation. Installation notes Verify electrical and wiring compatibility with the SF803 before installation. Follow system wiring diagrams and safety procedures provided by the heating system manufacturer when replacing or installing the controller. Confirm that the controller model SF803 matches the required control functions for your heater or boiler system. What you get One SF803 temperature controller unit packaged for installation in water heater and boiler heating systems. This description focuses on the SF803 function and practical applications. Confirm compatibility with your specific equipment and wiring requirements before and installation.