Description
The Watts F121471 is a 3/4″ LF174A series combination temperature and pressure (T&P) relief valve engineered to provide reliable overpressure and overtemperature protection for residential and light commercial water heaters and hydronic heating systems. Built with lead-free materials, this valve meets the stringent requirements of modern plumbing codes and safe drinking water standards.
Key Features
- Lead-free (LF) construction — compliant with NSF/ANSI 61 and NSF/ANSI 372 for safe drinking water applications
- 3/4″ inlet connection for straightforward installation on standard water heater and boiler ports
- 80 PSI pressure relief setting protects against dangerous overpressure conditions
- 1,400,000 BTU/hr rated capacity ensures adequate relief for high-demand water heating equipment
- Combination T&P design provides simultaneous temperature and pressure protection in a single valve
- Automatic reset operation — valve reseats after pressure or temperature returns to safe levels
- Durable brass body construction for long-lasting corrosion resistance
Specifications
- Brand: Watts
- Model Series: LF174A
- SKU: F121471
- Connection Size: 3/4″
- Pressure Setting: 80 PSI
- BTU Capacity: 1,400,000 BTU/hr
- Construction: Lead-Free Brass
Applications
- Residential and commercial water heaters
- Hydronic boilers and heating systems
- Potable hot water systems requiring lead-free compliance
- Replacement T&P valve installations where code-compliant, lead-free materials are required
The Watts LF174A series is a trusted industry standard for T&P relief protection. Its lead-free design makes it the go-to choice for contractors and facility managers who need code-compliant, high-capacity relief valves for both new installations and retrofit projects.
