Bluefin Mixing Valves

Bluefin mixing valves are lead-free thermostatic valves designed to blend hot and cold water to a preset, safe delivery temperature, protecting against scalding at fixtures and preventing bacterial growth in storage systems. Available from SupplyHouse exclusively, Bluefin mixing valves span multiple pipe sizes and connection types, from 1/2" to 3/4", with a maximum supply pressure rating of 150 PSI. Every Bluefin mixing valve in the lineup meets both ASSE 1017 and ASSE 1070 standards, covering point-of-source and point-of-use applications. Outlet temperature control runs from 80°F to 120°F across the standard range, giving installers a reliable, code-compliant solution for domestic water delivery on residential and light commercial jobs.

Bluefin mixing valves are a practical spec for any install where water heater storage temperature needs to run high enough to suppress Legionella while delivered water stays safely tempered at the fixture. That's a real problem on real jobs, and Bluefin mixing valves are built to solve it without a lot of drama.

KEY SUBCATEGORIES / PRODUCT TYPES

Sweat Mixing Valves

Bluefin Sweat Mixing Valves are lead-free copper-to-copper connection valves designed for point-of-use and point-of-source applications in systems using soldered copper piping. The Bluefin MVS050-2 is a 1/2" union sweat model with an 80°F to 120°F outlet range, a 150 PSI maximum pressure rating, and dual ASSE 1017 and ASSE 1070 certifications. Union connections on Bluefin sweat mixing valves allow for in-place servicing or element replacement without cutting into the line. Sweat-connection mixing valves are the go-to for retrofits into existing copper systems where continuity of connection method matters.

PEX Crimp Mixing Valves

Bluefin PEX Crimp Mixing Valves are lead-free thermostatic mixing valves with PEX crimp x PEX crimp connections, built for use in PEX-based domestic water systems. Available in 1/2" (SKU: PXMV050-2) and 3/4" (SKU: PXMV075-2), both models carry an 80°F to 120°F outlet control range and a 150 PSI maximum supply pressure rating, with ASSE 1017 and ASSE 1070 certifications on each. Bluefin PEX crimp mixing valves drop directly into PEX systems without adapters, which keeps the connection count down and the install straightforward. Contractors running 3/4" PEX on higher-demand residential installs will want to confirm the 3/4" model (PXMV075-2) rather than upsizing from 1/2".

Push-Fit Mixing Valves

Bluefin Push-Fit Mixing Valves are lead-free thermostatic mixing valves that accept push-fit connections, offering the fastest field installation of any Bluefin mixing valve configuration. Available in 1/2" (SKU: PFMV050) and 3/4" (SKU: PFMV075) sizes, Bluefin push-fit mixing valves maintain the same 80°F to 120°F outlet temperature range as the rest of the lineup. Push-fit connections work with copper, CPVC, and PEX pipe, making the PFMV series a versatile choice when a job involves mixed pipe materials or when time on the rough-in is tight. No crimping tools, no torch. Just cut clean and push.

Threaded Mixing Valves

Bluefin Threaded Mixing Valves are lead-free thermostatic mixing valves with female threaded (NPT) connections, suited for installations where threaded connections are specified or where future serviceability without soldering is a priority. Available in 1/2" (SKU: MVT050) and 3/4" (SKU: MVT075), Bluefin threaded mixing valves hold the same 80°F to 120°F outlet control range as the sweat and crimp models. Threaded connections make it practical to remove and replace the valve body without affecting adjacent piping, a detail worth noting on commercial retrofit work or anywhere a long-term maintenance plan is in place.

Under-Sink Mixing Valves

The Bluefin USTMV is a 3/8" thermostatic under-sink mixing valve designed for point-of-use installation at individual fixtures, particularly where delivered temperature control at a single faucet is the priority. Operating with a hot inlet temperature range of 120°F to 200°F and a cold inlet range of 38°F to 80°F, the USTMV produces a controlled outlet between 80°F and 120°F with flow rates from 0.5 to 3.2 GPM and a 150 PSI maximum supply pressure. Minimum supply pressure requirement is 30 PSI, with a hot-to-cold pressure differential tolerance of up to 25% and a minimum hot inlet-to-outlet differential of 15°F. Compression connections on both ends make the USTMV a clean fit under most residential lavatory and kitchen setups.

BUYING GUIDE / HOW TO CHOOSE

Sizing Bluefin mixing valves starts with two variables: pipe size and connection type. Get the pipe size wrong and the valve becomes a restriction. Get the connection type wrong and the job gets slower and more expensive in a hurry.

For pipe size, match the valve to the dominant supply line feeding the fixture or system. Most residential point-of-use applications run 1/2" and work comfortably with any 1/2" Bluefin mixing valve. Higher-demand domestic hot water systems, or runs serving multiple fixtures, are better served by the 3/4" PEX crimp or threaded models. When determining which Bluefin mixing valve size to use, account for flow demand at peak load, not just average use.

Connection type drives the selection from there. Sweat connections (MVS050-2) belong in copper systems. PEX crimp connections (PXMV050-2, PXMV075-2) are the direct fit for PEX B and PEX C systems using standard crimp rings. Push-fit models (PFMV050, PFMV075) span copper, CPVC, and PEX without special tooling, which makes them a natural on mixed-material jobs or service calls where speed matters. Threaded models (MVT050, MVT075) suit commercial retrofits or any install spec calling for NPT connections.

For under-sink point-of-use applications, the Bluefin USTMV is its own category. With compression fittings and a 3/8" body designed for fixture-level installation, it's the right tool when the goal is fixture-specific temperature control rather than system-wide tempering.

Every Bluefin mixing valve in the standard lineup carries ASSE 1017 and ASSE 1070 certifications. ASSE 1017 covers hot water source valves, and ASSE 1070 covers point-of-use fixture supply. For jobs where code compliance documentation matters, confirm the specific certifications needed for the jurisdiction and cross-reference with the model's listed standards before specifying.

One other variable worth noting: maximum supply pressure. All Bluefin mixing valves are rated to 150 PSI. On systems where supply pressure could exceed that, a PRV upstream is worth considering regardless of which mixing valve is in the plan.

FAQs

What's the difference between ASSE 1017 and ASSE 1070, and which certification do Bluefin mixing valves carry?

The difference between ASSE 1017 and ASSE 1070 is the application each standard covers. ASSE 1017 applies to point-of-source hot water tempering valves, typically installed at or near the water heater to control temperature leaving the storage system. ASSE 1070 applies to point-of-use fixture supply valves, covering delivered temperature at a specific fixture or fixture group. Bluefin mixing valves in the standard lineup, including the sweat, PEX crimp, and threaded models, carry both ASSE 1017 and ASSE 1070 certifications, making each model applicable to both source and point-of-use installations.

Can Bluefin mixing valves be used with PEX A tubing as well as PEX B?

The compatibility between Bluefin PEX crimp mixing valves and PEX tubing type depends on the crimp ring specification. Bluefin PEX crimp models (PXMV050-2 and PXMV075-2) use standard PEX crimp x PEX crimp connections compatible with PEX B and PEX C tubing using standard copper crimp rings. PEX A systems using expansion fittings may require an adapter or a different connection method. When working with PEX A, confirm the connection method with the tubing manufacturer's specifications before installing a crimp-end mixing valve.

What is the minimum supply pressure required for Bluefin mixing valves to function properly?

The minimum supply pressure specification varies by model within the Bluefin mixing valve lineup. For the Bluefin USTMV under-sink mixing valve (3/8" compression), the minimum supply pressure is 30 PSI with a maximum hot-to-cold pressure differential of 25%. For the standard sweat, threaded, PEX crimp, and push-fit Bluefin mixing valves, minimum pressure requirements should be confirmed in the installation instructions for the specific model, as supply pressure balance affects thermostatic performance across all mixing valve types.

How does a Bluefin mixing valve respond to a loss of hot or cold water supply?

A thermostatic mixing valve's response to supply loss is a critical safety function. When hot or cold supply to a Bluefin mixing valve is interrupted, the thermostatic element moves to an extreme position, restricting or shutting off outlet flow to prevent delivery of scalding hot or dangerously cold water at the fixture. Mixing valves designed to meet ASSE 1017 and ASSE 1070 standards, including Bluefin mixing valves, are required to incorporate this failsafe response as part of certification compliance.

What's the right Bluefin mixing valve for a point-of-use under-sink installation versus a whole-system installation at the water heater?

The right Bluefin mixing valve for a point-of-use application is the Bluefin USTMV, a 3/8" thermostatic under-sink mixing valve with compression connections, a flow range of 0.5 to 3.2 GPM, and an outlet temperature range of 80°F to 120°F for fixture-level temperature control. For a whole-system installation at the water heater, the 1/2" or 3/4" Bluefin mixing valves in sweat (MVS050-2), PEX crimp (PXMV050-2, PXMV075-2), push-fit (PFMV050, PFMV075), or threaded (MVT050, MVT075) configurations are the appropriate choice, matched to the pipe size and connection method of the supply line leaving the heater.