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The RD1430 series is an excellent control for ON/OFF hot water boiler systems. It can handle up to 3 boiler stages, with option for enabling boiler auto-rotation, changing lead stage and inter-stage lag differentials, and selecting the number of active boiler stages. Its Outdoor Reset control ensures efficient control of hot water temperature depending on outdoor temperature conditions. It is also uses the night setback technique to lower water temperatures MOST in mild weather, and LEAST during cold and freezing weather. The Morning Boost feature allows the increase of water temperature for a short period during cold, winter mornings.