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20 Best Thermostatic Mixing Valve (2022 Updated)

A thermostatic mixing valve is a valve that mixes hot water with cold water to maintain a constant temperature. The valve is usually installed in the hot water line, near the water heater.

20 Best Thermostatic Mixing Valve

Product Image Product Name Features Price

Sharkbite Thermostatic Mixing Valve 3/4"

  • 3/4″

Sharkbite Thermostatic Mixing Valve 3/4"

  • 3/4″

Watts LFMMVM1-UT 3/4" Lead Free Thermostatic Mixing Valve

  • 3/4 in

Watts LFUSG-B-M2 3/8" Lead Free Thermostatic Mixing Valve (0204143)

  • Maintains mixed water temperature to +/- 3°F up to 120°F (49°C)
  • Installs easily between stop valves & faucet
  • Includes tamper resistant locking cap to prevent accidental maladjustment

Watts LF1170-M2-UT Thermostatic Mixing Valve,1 in.

  • 1 in

Caleffi | 3 Way Thermostatic Mixing Valve – 521519A

  • Maintain Temperature
  • Compensates for both temperature and pressure fluctuations
  • Connection Type: Sweat

Honeywell AM100-US-1LF 1/2" Sweat Union Mixing Valve

  • Features dual purpose mixing or diverting values
  • Offers constant water temperature under changing operating conditions
  • Temperature is limited at any point and if cold water supply is interrupted, flow reduction occurs in seconds

Caleffi 521509A 3 Way Thermostatic Mixing Valve 3/4 Sweat

  • 150 ̊F Min flow for optimum performance: 1.0 gpm Gauge scale: 30 ̊.
  • 2016 , Drinking Water System Components.
  • Lead Content Reduction of Lead in Drinking Water Act , California Health and Safety Code 116875 S.

Honeywell AM102-1LF 1" Npt. Aquamix Lead Free Mixing Valve 70-145F

  • 1″

Direct Connect Water Heater Kit Including Valve, Tee, and 8 in. Flex Connector Honeywell AMX300TLF

  • Temperature is adjustable using push-twist-release locking hand wheel design and if cold water supply is interrupted, flow reduction occurs in seconds

Watts 1/2" Lead Free Sweat Tempering Valve – LF70A-F

  • 1/2″

Honeywell AM101-US-1LF Lead-Free Sweat Union Mixing Valves, 3/4 in

  • Features dual purpose mixing or diverting values
  • Offers constant water temperature under changing operating conditions
  • Temperature is limited at any point and if cold water supply is interrupted, flow reduction occurs in seconds

Watts LFUSG-B-M2 3/8" Lead Free Thermostatic Mixing Valve (0204143)

  • Maintains mixed water temperature to +/- 3°F up to 120°F (49°C)
  • Installs easily between stop valves & faucet
  • Includes tamper resistant locking cap to prevent accidental maladjustment

Watts LF1170-M2-US Thermostatic Mixing Valve,1 in.

  • 1 in

New Honeywell AM100-1LF Thermostatic Mixing Valve 1/2 NPT Lead-Free

  • Female NPT; Mixed Outlet.
  • Female NPT Inlet Connection Size: 1/2 Outlet Connection Size: 1/2 Temperature Range (F): 70F.
  • 145F Flow Capacity (Cv): 3.

Honeywell Home AM-1 Series Lead Free Mixing Valve, 1/2", AM100-UT-1LF

  • 1/2″

Taco 5124-HF-C1 1" Sweat High Flow Thermostatic Mixing Valve

  • 1″ / 5124 High
Sharkbite Thermostatic Mixing Valve 3/4"
  • 3/4″
Sharkbite Thermostatic Mixing Valve 3/4"
  • 3/4″
Watts LFMMVM1-UT 3/4" Lead Free Thermostatic Mixing Valve
  • 3/4 in
Watts LFUSG-B-M2 3/8" Lead Free Thermostatic Mixing Valve (0204143)
  • Maintains mixed water temperature to +/- 3°F up to 120°F (49°C)
  • Installs easily between stop valves & faucet
  • Includes tamper resistant locking cap to prevent accidental maladjustment
Watts LF1170-M2-UT Thermostatic Mixing Valve,1 in.
  • 1 in
Caleffi | 3 Way Thermostatic Mixing Valve – 521519A
  • Maintain Temperature
  • Compensates for both temperature and pressure fluctuations
  • Connection Type: Sweat
Honeywell AM100-US-1LF 1/2" Sweat Union Mixing Valve
  • Features dual purpose mixing or diverting values
  • Offers constant water temperature under changing operating conditions
  • Temperature is limited at any point and if cold water supply is interrupted, flow reduction occurs in seconds
Caleffi 521509A 3 Way Thermostatic Mixing Valve 3/4 Sweat
  • 150 ̊F Min flow for optimum performance: 1.0 gpm Gauge scale: 30 ̊.
  • 2016 , Drinking Water System Components.
  • Lead Content Reduction of Lead in Drinking Water Act , California Health and Safety Code 116875 S.
Honeywell AM102-1LF 1" Npt. Aquamix Lead Free Mixing Valve 70-145F
  • 1″
Direct Connect Water Heater Kit Including Valve, Tee, and 8 in. Flex Connector Honeywell AMX300TLF
  • Temperature is adjustable using push-twist-release locking hand wheel design and if cold water supply is interrupted, flow reduction occurs in seconds
Watts 1/2" Lead Free Sweat Tempering Valve – LF70A-F
  • 1/2″
Honeywell AM101-US-1LF Lead-Free Sweat Union Mixing Valves, 3/4 in
  • Features dual purpose mixing or diverting values
  • Offers constant water temperature under changing operating conditions
  • Temperature is limited at any point and if cold water supply is interrupted, flow reduction occurs in seconds
Watts LFUSG-B-M2 3/8" Lead Free Thermostatic Mixing Valve (0204143)
  • Maintains mixed water temperature to +/- 3°F up to 120°F (49°C)
  • Installs easily between stop valves & faucet
  • Includes tamper resistant locking cap to prevent accidental maladjustment
Watts LF1170-M2-US Thermostatic Mixing Valve,1 in.
  • 1 in
New Honeywell AM100-1LF Thermostatic Mixing Valve 1/2 NPT Lead-Free
  • Female NPT; Mixed Outlet.
  • Female NPT Inlet Connection Size: 1/2 Outlet Connection Size: 1/2 Temperature Range (F): 70F.
  • 145F Flow Capacity (Cv): 3.
Honeywell Home AM-1 Series Lead Free Mixing Valve, 1/2", AM100-UT-1LF
  • 1/2″
Taco 5124-HF-C1 1" Sweat High Flow Thermostatic Mixing Valve
  • 1″ / 5124 High

1. Sharkbite Thermostatic Mixing Valve 3/4″

Sharkbite Thermostatic Mixing Valve 3/4

  • 3/4″

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Sold By Price
Amazon.com
Walmart – DropAir
Home Depot
MegaDepot

Product Details

Reviews From Real Customers

S.A.A.
C.&.S.
Don't Text and Drive

2. Sharkbite Thermostatic Mixing Valve 3/4″

Sharkbite Thermostatic Mixing Valve 3/4

  • 3/4″

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Sold By Price
Amazon.com
Walmart – DropAir
Home Depot
MegaDepot

Product Details

3. Watts LFMMVM1-UT 3/4″ Lead Free Thermostatic Mixing Valve

Watts LFMMVM1-UT 3/4

  • 3/4 in

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Amazon
eBay
Walmart
CPEsupply.com

Product Details

Specifications

Details
Maximum Pressure 150 psi
Maximum Temperature 120 °F
Number in Package 1 pk
Each Weight 2.830 LB
End 1 Size 3/4″

Reviews From Real Customers

lmdew
Jim
Seamas

4. Watts LFUSG-B-M2 3/8″ Lead Free Thermostatic Mixing Valve (0204143)

Watts LFUSG-B-M2 3/8

  • Maintains mixed water temperature to +/- 3°F up to 120°F (49°C)
  • Installs easily between stop valves & faucet
  • Includes tamper resistant locking cap to prevent accidental maladjustment
  • Built-in check valves prevent migration of hot water to cold and cold water to hot water piping
  • Provided with cap for three port application

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Sold By Price
Amazon
eBay
Plumbing Deals.Com
eBirdsall.com

Product Details

Specifications

Details
Certifications LEAD-FREE
Warranty 1 Year
Pack Size 1
Indoor/Outdoor Indoor
Product Depth (in.) .5

Reviews From Real Customers

Engineer
Andrew W
Plumber Dave

5. Watts LF1170-M2-UT Thermostatic Mixing Valve,1 in.

Watts LF1170-M2-UT Thermostatic Mixing Valve,1 in.

  • 1 in

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Sold By Price
Amazon
Grainger Industrial Supply

Product Details

Specifications

Details
Flow Rate 23 gpm
Inlet Type Union
Outlet Type Threaded
Inlet Size 1 in
Outlet Size 1 in

6. Caleffi | 3 Way Thermostatic Mixing Valve – 521519A

Caleffi | 3 Way Thermostatic Mixing Valve - 521519A

  • Maintain Temperature
  • Compensates for both temperature and pressure fluctuations
  • Connection Type: Sweat
  • Connection Size: 0.75-Inch

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Amazon
eBay
AF Supply
eBirdsall.com

Product Details

Specifications

Details
Connection Method Sweat
Connection Type C x C
Max Pressure (PSI) 200
Temperature Range (F) 85°F – 150°F
Max Temp (F) 150°F

Reviews From Real Customers

JohnnyD
E.J.
H.E.D.C.

7. Honeywell AM100-US-1LF 1/2″ Sweat Union Mixing Valve

Honeywell AM100-US-1LF 1/2

  • Features dual purpose mixing or diverting values
  • Offers constant water temperature under changing operating conditions
  • Temperature is limited at any point and if cold water supply is interrupted, flow reduction occurs in seconds
  • Provides reliable performance at minimum flow of 05 gpm and proportional valve for simultaneous control of hot and cold
  • Tamper resistant design

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Sold By Price
Amazon
eBay
PlumbersStock.com
SupplyHouse.com

Product Details

Specifications

Details
Connection Method Sweat
Connection Type C x C
Min Temp (F) 70°F
Max Temp (F) 145°F
Temperature Range (F) 70°F – 145°F

Reviews From Real Customers

Jake
SteveM
w.

8. Caleffi 521509A 3 Way Thermostatic Mixing Valve 3/4 Sweat

Caleffi 521509A 3 Way Thermostatic Mixing Valve 3/4 Sweat

  • 150 ̊F Min flow for optimum performance: 1.0 gpm Gauge scale: 30 ̊.
  • 2016 , Drinking Water System Components.
  • Lead Content Reduction of Lead in Drinking Water Act , California Health and Safety Code 116875 S.

Check Latest Price

Sold By Price
Amazon
eBay
Walmart – Patriot Supply
AF Supply

Product Details

Specifications

Details
Connection Type C x C
Connection Method Sweat
Max Pressure (PSI) 200
Temperature Range (F) 85°F – 150°F
Max Temp (F) 150°F

Reviews From Real Customers

J.W.
Yaski
rswojo

9. Caleffi Mixing Cal 3-Way Thermostatic Mixing Valve, Low-Lead Brass with Adaptor by Caleffi 521519A

Caleffi Mixing Cal 3-Way Thermostatic Mixing Valve, Low-Lead Brass with Adaptor by Caleffi 521519A

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Amazon
Home Essentials Direct

Product Details

Reviews From Real Customers

SMS

10. Watts LFMMV-M1-UT Thermostatic Mixing Valve,1/2 in.

Watts LFMMV-M1-UT Thermostatic Mixing Valve,1/2 in.

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Sold By Price
Amazon
Grainger Industrial Supply
Zoro
Sears – SIM Supply

Product Details

Specifications

Details
Flow Rate 13 gpm
Inlet Type Union
Outlet Type Threaded
Inlet Size 1/2 in
Outlet Size 1/2 in

11. Honeywell AM102-1LF 1″ Npt. Aquamix Lead Free Mixing Valve 70-145F

Honeywell AM102-1LF 1

  • 1″

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Sold By Price
Amazon
eBay – laps-heating
Zoro
SupplyHouse.com

Product Details

Specifications

Details
Connection Method Threaded
Connection Type FNPT x FNPT
Temperature Range (F) 70°F – 145°F
Min Temp (F) 70°F
Max Temp (F) 145°F

Reviews From Real Customers

Magic Hands
Mountain Plumber
Barefootbear

12. Direct Connect Water Heater Kit Including Valve, Tee, and 8 in. Flex Connector Honeywell AMX300TLF

Direct Connect Water Heater Kit Including Valve, Tee, and 8 in. Flex Connector Honeywell AMX300TLF

  • Temperature is adjustable using push-twist-release locking hand wheel design and if cold water supply is interrupted, flow reduction occurs in seconds
  • Kit includes mixing valve, cold water tee fitting and flexible stainless steel connector
  • The alternate hot port bypasses hot water directly from the tank to non-mixed temperature applications
  • Brass/stainless construction with Teflon coated wear surfaces for extended surface
  • Temperature is adjustable using pushtwistrelease locking hand wheel design

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eBay
Walmart – Home Essentials Depot
SupplyHouse.com

Product Details

Specifications

Details
Inlet Connection Size 0.75 in.
Product Width (in.) 5.5
Product Height (in.) 3
Product Type Fittings
Pack Size 1

Reviews From Real Customers

The Dude
Boyofcows
CAL

13. Watts 1/2″ Lead Free Sweat Tempering Valve – LF70A-F

Watts 1/2

  • 1/2″

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Amazon
eBay
MrSupply.com
AF Supply

Product Details

Specifications

Details
Valve Type Pressure Regulating

Reviews From Real Customers

bravestar1
goodstuff-richard
Kaiser

14. Honeywell AM101-US-1LF Lead-Free Sweat Union Mixing Valves, 3/4 in

Honeywell AM101-US-1LF Lead-Free Sweat Union Mixing Valves, 3/4 in

  • Features dual purpose mixing or diverting values
  • Offers constant water temperature under changing operating conditions
  • Temperature is limited at any point and if cold water supply is interrupted, flow reduction occurs in seconds
  • Provides reliable performance at minimum flow of 05 gpm and proportional valve for simultaneous control of hot and cold
  • Tamper resistant design

Check Latest Price

Sold By Price
Amazon
eBay
SupplyHouse.com
AF Supply

Product Details

Specifications

Details
Inlet Connection Size 0.75 in.
Color Bronze
Product Width (in.) 3.75
Product Height (in.) 3.5
Product Type Fittings

Reviews From Real Customers

b.
Williasp
E.F.K.

15. Honeywell AM101-US-1LF 3/4 in. Sweat Union Mixing Valves

Honeywell AM101-US-1LF 3/4 in. Sweat Union Mixing Valves

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Amazon
Oozzio
Voomi Supply
PartsAPS

Product Details

16. Watts LFUSG-B-M2 3/8″ Lead Free Thermostatic Mixing Valve (0204143)

Watts LFUSG-B-M2 3/8

  • Maintains mixed water temperature to +/- 3°F up to 120°F (49°C)
  • Installs easily between stop valves & faucet
  • Includes tamper resistant locking cap to prevent accidental maladjustment
  • Built-in check valves prevent migration of hot water to cold and cold water to hot water piping
  • Provided with cap for three port application

Check Latest Price

Sold By Price
Amazon
eBay
Plumbing Deals.Com
eBirdsall.com

Product Details

Specifications

Details
Certifications LEAD-FREE
Warranty 1 Year
Pack Size 1
Indoor/Outdoor Indoor
Product Depth (in.) .5

Reviews From Real Customers

Johnny g

17. Watts LF1170-M2-US Thermostatic Mixing Valve,1 in.

Watts LF1170-M2-US Thermostatic Mixing Valve,1 in.

  • 1 in

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eBay – zorotools
Walmart – METROGOODS USA
Grainger Industrial Supply
Zoro

Product Details

Specifications

Details
Flow Rate 23 gpm
Inlet Type Union
Outlet Type Solder
Inlet Size 1 in
Outlet Size 1 in

18. New Honeywell AM100-1LF Thermostatic Mixing Valve 1/2 NPT Lead-Free

New Honeywell AM100-1LF Thermostatic Mixing Valve 1/2 NPT Lead-Free

  • Female NPT; Mixed Outlet.
  • Female NPT Inlet Connection Size: 1/2 Outlet Connection Size: 1/2 Temperature Range (F): 70F.
  • 145F Flow Capacity (Cv): 3.

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eBay
State Supply
Zoro

Product Details

Reviews From Real Customers

supplyhouse.com
Norm

19. Honeywell Home AM-1 Series Lead Free Mixing Valve, 1/2″, AM100-UT-1LF

Honeywell Home AM-1 Series Lead Free Mixing Valve, 1/2

  • 1/2″

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eBay
PlumbersStock.com
Zoro
SupplyHouse.com

Product Details

Specifications

Details
Pipe Size (inch) 1/2 in.
Capacity Cv) 3.9 Cv
ASSE 1017
Connection Type FNPT x FNPT
Connection Method Threaded

Reviews From Real Customers

Joacchim
BobM
have to go the store

20. Taco 5124-HF-C1 1″ Sweat High Flow Thermostatic Mixing Valve

Taco 5124-HF-C1 1

  • 1″ / 5124 High

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PlumbersStock.com
AF Supply
SupplyHouse.com
Home Perfect

Product Details

Specifications

Details
Body Pattern 3-Way
Connection Type C x C
Connection Method Sweat
Max Flow (GPM) 27.2
Max Pressure (PSI) 230

Reviews From Real Customers

Hemingway
plumber
mjc2ride

Conclusion

A thermostatic mixing valve is a valve that is used to mix two different fluids together at a desired temperature. The two fluids can be either liquids or gases. The mixing valve is typically used to mix hot and cold water together to create a desired water temperature.

The valve is also used in HVAC applications to mix different types of air together. The mixing valve is controlled by a thermostat that monitors the temperature of the mixed fluid. The thermostat will adjust the flow of the two fluids in order to maintain the desired temperature.

The mixing valve can also be used to regulate the flow of two fluids that are not at the same temperature. This is done by controlling the valve to only allow a certain amount of the hotter fluid to mix with the cooler fluid.

This prevents the mixed fluid from becoming too hot.

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