Lochinvar L100208152 Temperature Pressure Gauge

Product Description

The LOCHINVAR L100208152 is a combination temperature-pressure gauge designed for hydronic heating and hot water system applications. It monitors both pressure and temperature simultaneously from a single instrument, reducing the number of penetrations required on boilers, water heaters, and related equipment. The gauge reads pressure from 0 to 75 PSI and temperature from 70 to 250 degrees F. It connects via a 3/8 inch bottom-entry (BT) threaded fitting, making it a straightforward field replacement on systems where the original gauge has failed or drifted out of calibration. Licensed HVAC technicians and plumbers are the primary installers of this type of instrument.

This gauge is suited for residential and light commercial hydronic systems, including gas-fired and oil-fired boilers and indirect water heaters. The 0-75 PSI range and 70-250 degrees F temperature span cover typical closed-loop heating system operating parameters. The bottom-entry connection style positions the dial face outward for clear visibility once mounted on a boiler or expansion tank tee. Install location is typically on the boiler supply line or on the boiler vessel itself, wherever the original instrument port is located.

Key Features

• Dual-function gauge reads both pressure and temperature from a single instrument
• Pressure range of 0 to 75 PSI suitable for standard residential and light commercial hydronic systems
• Temperature range of 70 to 250 degrees F covers normal boiler operating and high-limit thresholds
• 3/8 inch bottom-entry threaded connection for direct mounting to standard gauge ports
• OEM replacement part for LOCHINVAR boiler and water heating equipment

Compatibility

Designed as an OEM-style replacement temperature-pressure gauge for LOCHINVAR boiler and water heater systems equipped with a 3/8 inch bottom-entry gauge port in the 0-75 PSI service range.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician. Before removing the existing gauge, shut down the boiler and relieve system pressure completely. Use an appropriate thread sealant rated for hydronic systems on the 3/8 inch fitting threads. Verify the replacement gauge pressure and temperature ranges match the system design parameters before returning the equipment to service.

Technical Specifications

• Product Type: Temperature-Pressure Gauge
• Pressure Range: 0-75 PSI
• Temperature Range: 70-250 degrees F
• Connection Size: 3/8 inch
• Connection Type: Bottom Entry (BT)

Standard Information

• Brand: LOCHINVAR
• Manufacturer Part Number: L100208152