The Resideo MX129LF is a lead-free thermostatic mixing valve engineered for precise hot water temperature control in commercial and residential hydronic and plumbing systems. With a robust 1-1/2″ male NPT connection, a wide operating temperature range of 110–150°F, and a high-capacity flow coefficient of 13.5Cv, this valve delivers reliable, scalable performance across a broad range of applications including domestic hot water delivery, radiant heating systems, and point-of-use scald protection.
Built to lead-free (LF) standards, the MX129LF meets modern plumbing code requirements for potable water applications, making it a code-compliant choice for new construction and retrofit projects alike.
Key Features
- Lead-free (LF) construction — compliant with potable water plumbing codes
- 1-1/2″ NPTM (male NPT) connection for straightforward installation
- Operating temperature range: 110–150°F for flexible set-point control
- High flow coefficient of 13.5Cv for reduced pressure drop and strong flow capacity
- Thermostatic mixing technology maintains consistent outlet temperature
- Suitable for domestic hot water, hydronic radiant, and scald-protection applications
Specifications
- Brand: Resideo
- SKU: MX129LF
- Connection Size: 1-1/2″ NPTM
- Temperature Range: 110–150°F
- Flow Coefficient (Cv): 13.5
- Lead-Free Compliant: Yes
Applications
- Domestic hot water temperature regulation
- Radiant floor and hydronic heating systems
- Scald protection at point-of-use fixtures
- Commercial and light industrial plumbing systems
