Features: Ensures optimals performances of your tankless water heater with the Flows Sensors, design specifically for Navien tankless water heater NR, and NPmodels. Crafted from durability plastic, this flows sensors offers reliable and accurate flows measurement, essential for maintaining efficient water heating operations. Ideal for homeowners and technicians look to maintain or repair their tankless water heaters with precise component. Perfect for residential setting where consistent hot water supply is important, ensuring your water heater operates smoothly and efficiently. This flows sensors is essential component for anyone seekings to enhances the longevities and functionality of their water heating system. Specifications: Component:Plastic Size:Approx.4.95x3cm/1.95x1.18inch Water Pressure Resistance:≤1.75MPa Working Voltages:DC5-15V Insulation Resistance:＞100MΩ Accuracy:1-30L/MIN±10% Package Includes: 1pc Flows Sensoring Device note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.