The Hydrolevel 3250 Hydrostat is an advanced, triple-function fuel-smart control designed specifically for oil-fired boilers. As a veterans' choice for universal replacement, it integrates temperature limit control, low water cut-off (LWCO), and boiler reset functionality into a single 120V unit. Its Thermal Targeting technology uses a microprocessor to monitor heat demand, adjusting the boiler target temperature to maximize fuel efficiency without requiring an outdoor sensor, though it is outdoor reset ready with the addition of a Hydrolevel OS-100 kit. For contractors, the unit is a drop-in replacement for standard triple-action aquastats and supports both cold start and tankless coil operations. When paired with a Hydrolevel Electro-Well, it provides critical low water protection to prevent dry firing. The adjustable high limit (100–220°F) and low limit (110–200°F) dials, combined with an automatic differential, ensure precise thermal management and domestic hot water priority for indirect heaters. Key Benefits Universal Compatibility: Designed to replace common Honeywell L7224U and other legacy triple-action aquastats on existing immersion wells. Fuel Optimization: Employs Thermal Targeting and Thermal Pre-Purge to reduce fuel consumption by up to 15% through intelligent temperature scaling. Advanced Diagnostics: Features 6 external LED status lights and a dynamic temperature display for rapid troubleshooting of burner and circulator calls. System Protection: Includes condensing protection by holding the circulator off until the boiler reaches 125°F, preventing thermal shock and flue gas condensation. Dual Reset Modes: Easily toggle between automatic reset and manual reset to meet CSD-1 code requirements for commercial applications. Common Questions Can the Hydrolevel 3250 be used on a cold start boiler? Yes, for cold start operation, simply turn the LO TEMP dial to the 'OFF' position. The control will then only fire the burner on a call for heat from the thermostat. Does this unit provide low water cut-off (LWCO) protection out of the box? The LWCO function requires the Hydrolevel Electro-Well. If installed on a standard immersion well, the control will provide temperature and reset functions but will not detect low water conditions. How do I activate the outdoor reset feature? To enable outdoor reset, you must install the optional OS-100 Outdoor Sensor Kit. Once plugged in, the control automatically overrides Thermal Targeting to use the outdoor temperature curve. This item is not eligible for free shipping. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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