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A Delta P controller, or differential pressure controller, is used in heating systems to maintain a constant pressure difference across a valve or circuit. It helps balance flow in hydronic systems, ensuring even heat distribution and preventing noise or vibration. This device is often installed in boiler systems with variable speed pumps or multiple zones. By automatically adjusting the valve position, it improves energy efficiency and system stability. Replacement is necessary when the controller fails to maintain set pressure, causing uneven heating.