Watts W-0121666 Bimetal Thermometer 1.5 in Dial Lead Free

Product Description

The WATTS W-0121666 is a center back-entry bimetal thermometer from the Series LFTB line, built for temperature measurement in commercial, residential, and institutional HVAC and plumbing systems. It features a 1.5-inch dial and a bimetal spiral spring sensing element that reads both Fahrenheit and Celsius scales. The connection is a 1/2 inch NPT threaded fitting using a lead free brass thermowell with set screw. The case is zinc-plated steel with a Kostil Polymer window. Lead free construction meets current lead free installation requirements across applicable codes.

Series LFTB thermometers are suited for hydronic heating systems, chilled water lines, domestic hot and cold water piping, and general HVAC fluid monitoring. The center back-entry mount allows clean inline installation where space is limited on pipe runs. The dry-type design and compact 1.5-inch dial make this thermometer a common choice for commercial mechanical rooms, institutional facilities, and residential boiler and water heater applications where a compact, readable temperature indicator is required.

Key Features

• Lead free construction for compliance with lead free installation requirements
• 1.5-inch dial with dual-scale readout in Fahrenheit and Celsius
• 1/2 inch NPT threaded center back-entry connection
• Bimetal spiral spring sensing element for reliable, maintenance-free temperature indication
• Zinc-plated steel case with Kostil Polymer window for durability
• Dry-type design rated from 32 to 176 degrees F

Compatibility

Designed as an OEM-style replacement or new-installation thermometer for HVAC, plumbing, and hydronic systems requiring a 1/2 inch NPT back-entry bimetal thermometer with a 1.5-inch dial.

Installation Notes

Installation is typically performed by a licensed plumber or HVAC technician. Shut off fluid flow and relieve system pressure before inserting or removing the thermowell. Apply appropriate thread sealant to the 1/2 inch NPT connection per local plumbing code requirements. Tighten the thermowell set screw to secure the sensing element before restoring system pressure.