Hydrolevel EL1220 Sensing Probe

The Hydrolevel EL1220 Sensing Probe (Part Number 45-220) is a critical component for maintaining precise water level management in low water cut-off (LWCO) systems. This 1/2" NPT standard ceramic probe is designed with a 2 7/8" inside dimension insertion length, making it a direct replacement for various Safgard and CycleGard residential and light commercial boiler controls. Engineered for long-term durability in high-heat environments, the heavy-duty ceramic insulator prevents scale buildup and electrical shorts, ensuring the Safgard 400, 500, 600, or 700 series controller receives an accurate signal. When troubleshooting a boiler low water cut-off, a fouled or cracked probe is often the culprit behind intermittent burner lockouts. This OEM replacement probe provides the necessary sensitivity for liquid level sensing in steam or hot water applications, allowing for safe system operation and effective boiler level monitoring without the risk of false-positive readings caused by sediment or corrosion.

• Universal Compatibility: Fits Hydrolevel Safgard 24, 170, 400, 500, 600, 700 series, and CycleGard CG400/CG450 series controls.
• Industrial-Grade Construction: Standard ceramic sensing probe housing resists corrosion and thermal stress for consistent conductivity.
• Precise Dimensions: Features a 1/2" NPT connection and standard 2 7/8" insertion depth for accurate water line detection.
• Scale Resistance: Specialized ceramic tip design minimizes mineral accumulation, reducing the frequency of probe cleaning and maintenance.

How do I know if my sensing probe needs replacement?
If your LWCO control shows a low water light despite a full boiler sight glass, the probe may be fouled by scale or the ceramic insulator may be cracked. Testing the probe for continuity to ground while dry and resistance when submerged is a standard diagnostic step.

Can I use the EL1220 in place of an EL1214?
No. The EL1220 utilizes a 1/2" NPT thread, whereas the EL1214 uses a 3/4" NPT thread. Always verify the port size on your boiler or the reduction tee before installation.

Does this probe work on both steam and hot water boilers?
Yes, the EL1220 is designed to operate in both steam and hydronic heating systems, provided the control unit is compatible with the 45-220 part number.

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.