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Bronze thermostatic mixing valve, compact rectangular body, threaded inlet and outlet ports

Leonard Valve

Leonard Valve 370-LF thermostatic mixing valve bronze 0.5 to 13 gpm

SKU CH-40S5-1GZB2

Thermostatic mixing valve in bronze blends hot and cold water from 0.5 to 13 gpm at 90 to 140 °F, meets ASSE 1017 and 1070 standards, and withstands 125 psi

  • Precise temperature control from 90 to 140°F protects users from scalding
  • Flow range of 0.5 to 13 gpm suits low-demand and high-demand fixtures
  • Bronze body with integral check valves resists corrosion and prevents cross-flow
  • Certified to ASSE 1017, ASSE 1070 and CSA B125.70 for code compliance
  • Polymer shuttle and stainless-steel springs deliver reliable thermostatic response over time

Thermostatic Mixing Valve 370-LF

The Leonard Valve 370-LF is a bronze thermostatic mixing valve designed for plumbing systems that require precise temperature control. It serves installers and facility managers who need a reliable way to blend hot and cold water to a safe, consistent outlet temperature for domestic or light commercial fixtures.

Sustained Load Behaviour

The valve maintains its set point across a flow range of .5 to 13 gpm, using a polymer thermoplastic shuttle and stainless steel springs that respond continuously to inlet fluctuations. Integral check valves prevent cross-flow during prolonged operation, while the Buna-N O-ring and bronze body resist wear under continuous pressure up to 125 psi.

Interface Practical Limits

Connections are 3/4 in MNPT inlets and outlets, limiting installation to piping that matches this thread size and type. The valve is certified to ASSE 1017, ASSE 1070, ASSE 1070-2015 and CSA B 125.70 -15, so it cannot be used where other standards are mandated. Hot inlet temperature must stay between 120 and 200 degrees F, and the adjustable outlet range stops at 140 degrees F.

How it compares

Measured against everything we stock in Faucet Valves & Replacement Parts, at today’s prices. Recalculated every night.

Price $140.99
Pricier than about 71% of the 1,132 comparable items (median $54.99).

Specifications

Product
Brand nameLEONARD VALVE
Product typeOther

Questions about this item

How much heat does the 370-LF valve add to a mechanical room when it runs all day?

The valve itself generates no heat; it only blends hot water at 120 to 200 °F down to a 90 to 140 °F outlet using a polymer thermoplastic shuttle and stainless steel springs, so room temperature is unaffected.

What piping must already be in place for the 3/4 in MNPT inlets and outlets to connect?

You need 3/4 inch male NPT threaded connections on both hot and cold supply lines and on the mixed-water outlet, rated for at least 125 psi and the 0.5 to 13 gpm flow range.

Will the integral check valves on the 370-LF interfere with an older gravity-fed hot-water loop?

The integral check valves prevent cross-flow between hot and cold inlets, which is compatible with gravity-fed systems as long as supply pressure does not exceed 125 psi and inlet temperatures stay within 120 to 200 °F.

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