Watts 0121450 Valve

The Watts 0121450 (Model LF140S-3-1-125) is a high-capacity, 1-inch lead-free temperature and pressure relief valve engineered for commercial hot water supply tanks and heaters. This automatic reseating valve is the direct updated replacement for legacy models 0256651 and LF140S3-125-1. With a massive steam discharge capacity of 2.61 million BTU/hr and an ASME pressure rating, this valve ensures critical safety by preventing thermal expansion and over-pressure conditions in large-scale domestic water systems. The unit features a 3-inch stainless steel thermostat probe, making it suitable for direct installation into tank tappings where high-heat sensitivity is required.

Constructed with a lead-free copper silicon alloy body, the Watts 0121450 water heater valve meets all stringent potable water requirements while resisting corrosive environments. The commercial T&P valve is factory-set at 125 psi with a temperature relief threshold of 210°F. The unique non-mechanical seat-to-disc alignment and tamper-resistant bonnet screws provide long-term reliability for facility managers and mechanical contractors. Designed for professional integration, this ASME rated relief valve includes a test lever for standard maintenance protocols and is compatible with modern flood detection sensors using SentryPlus Alert technology.

• High BTU Capacity: Provides protection for systems up to 2,610,000 BTU/hr, ensuring compliance with large commercial boiler and heater specifications.
• Lead-Free Reliability: Compliance with lead-free mandates for potable water applications using high-durability copper silicon alloy construction.
• Precise Protection: Dual-action relief triggers at 125 psi or 210°F to maintain vessel integrity.
• Contractor Grade: Features FNPT inlet/outlet connections and a 3-inch stainless steel thermostat for standard side or top tank tappings.

Common Questions

Is the Watts 0121450 a direct replacement for the LF140S3-125-1?
Yes, this model is the updated professional-grade equivalent and serves as a drop-in replacement for 0256651 and several older 140S series configurations.

Can this valve be used in internal flue heaters?
The 3-inch thermostat length is optimized for standard tank tappings. Always verify the thermostat extension depth against the manufacturer's flue clearance requirements before installation.

Does this valve come with a flood sensor?
While this unit includes the integrated flood sensor port and SentryPlus Alert technology, active monitoring requires a separate connection kit for BMS or cellular integration.

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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.