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Grainger provides boiler control options for your installation, repair and retrofitting projects. Boiler reset controls and variable speed pump control include outdoor and strap-on sensors, with sensor range from -30° to 200°F. These controls are CSA certified for U.S. and Canada. Boiler zoning controls feature a PC board layout for simplified wiring, external indicator lights for diagnostic feedback and an isolated end switch. Controls feature universal thermostat compatibility. Hydro fan unit controls are ETL listed for U.S. and Canada. Switching relays enable complete system customization and are UL and C-UL listed. Shop Grainger today for a dependable boiler control unit for your hydronic heating system.