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Maxline Thermostatic Temperature Limiting Devices
by Symmons

Known for their innovative and outstanding products, Symmons is a name you can associate with top quality every time. These Thermostatic Water Temperature Limiting Devices are designed for worry-free performance, year after year. When you want superior products, think Symmons! If you are looking for more from Symmons, click here.

Please note: The Symmons Maxline #5 and #6 Series previously featured have been replaced by the #7 Series (2014 Federal Safe Drinking Water Act compliant) valves listed below. These are the SAME valves as the #5 and #6 Series, now constructed of low lead materials.

Symmons Maxline™ Thermostatic Water Temperature Limiting Device #7-225-CK-MS
1/2" Male NPT/Sweat Inlets/Outlet

This Thermostatic Water Temperature Limiting valve needs to be sized according to the flow capacity to be required, NOT by the pipe size supplied to the valve. View pressure drop chart

5-225-CK-MS
Features:
  • Mixing valve with integral checks and ultra responsive thermal motor
  • 1/2" male NPT and Sweat inlets/outlet
  • Durable cast brass body with internal ceramic cartridge
  • Dual stainless steel strainers protect against suspended particulate in lines
  • Vandal resistant cap/temperature adjustment handle
  • Temperature control range: 60-140° F.
  • 0.5 gpm - 14 gpm flow rate
  • Installation & maintenance instructions included
  • Dual certified for ASSE 1017/1070
  • Click here for dimensions
  • Buy American Act Compliant Buy American Act compliant button

#7-225-CK-MS Mixing Valve With Integral Checks = $138.87

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Symmons Maxline™ Thermostatic Water Temperature Limiting Device #7-225-CK-F
1/2" Female NPT Inlets/Outlet

This Thermostatic Water Temperature Limiting valve needs to be sized according to the flow capacity to be required, NOT by the pipe size supplied to the valve. View pressure drop chart

7-225-CK-F
Features:
  • Mixing valve with integral checks and ultra responsive thermal motor
  • 1/2" female NPT inlets/outlet
  • Durable cast brass body with internal ceramic cartridge
  • Dual stainless steel strainers protect against suspended particulate in lines
  • Vandal resistant cap/temperature adjustment handle
  • Temperature control range: 60-140° F.
  • 0.5 gpm - 14 gpm flow rate
  • Installation & maintenance instructions included
  • Dual certified for ASSE 1017/1070
  • Click here for dimensions
  • Buy American Act Compliant Buy American Act compliant button

#7-225-CK-F Mixing Valve With Integral Checks = $138.96

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Symmons Maxline™ Thermostatic Water Temperature Limiting Device #7-225-CK-PEX
1/2" PEX Inlets/Outlet

This Thermostatic Water Temperature Limiting valve needs to be sized according to the flow capacity to be required, NOT by the pipe size supplied to the valve. View pressure drop chart

5-225-CK-PEX
Features:
  • Mixing valve with integral checks and ultra responsive thermal motor
  • 1/2" PEX inlets/outlet
  • Durable cast brass body with internal ceramic cartridge
  • Dual stainless steel strainers protect against suspended particulate in lines
  • Vandal resistant cap/temperature adjustment handle
  • Temperature control range: 60-140° F.
  • 0.5 gpm - 12 gpm flow rate
  • Installation & maintenance instructions included
  • Dual certified for ASSE 1017/1070
  • Click here for dimensions
  • Buy American Act Compliant Buy American Act compliant button

#7-225-CK-PEX Mixing Valve With Integral Checks WITHOUT Wall Bracket = $137.90
#7-225-CK-PEX Mixing Valve WITH Integral Checks & Wall Bracket = $145.24

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Symmons Maxline™ Thermostatic Water Temperature Limiting Device #7-230-CK-M
3/4" Male NPT Inlets/Outlet

This Thermostatic Water Temperature Limiting valve needs to be sized according to the expected flow capacity, NOT by the pipe size supplied to the valve. View pressure drop chart

7-230-CK-M
Features:
  • Mixing valve with integral checks and ultra responsive thermal motor
  • 3/4" male NPT inlets/outlet
  • Durable cast brass body with internal ceramic cartridge
  • Dual stainless steel strainers protect against suspended particulate in lines
  • Vandal resistant cap/temperature adjustment handle
  • Temperature control range: 60-140° F.
  • 0.5 gpm - 14 gpm flow rate
  • Installation & maintenance instructions included
  • Dual certified for ASSE 1017/1070
  • Click here for dimensions
  • Buy American Act Compliant Buy American Act compliant button

#7-230-CK-M Mixing Valve With Integral Checks = $157.94

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Symmons Maxline™ Thermostatic Water Temperature Limiting Device #7-230-CK-FS
3/4" Female Sweat Inlets/Outlet

This Thermostatic Water Temperature Limiting valve needs to be sized according to the flow capacity to be required, NOT by the pipe size supplied to the valve. View pressure drop chart

5-230-CK-FS
Features:
  • Mixing valve with integral checks and ultra responsive thermal motor
  • 3/4" female sweat inlets/outlet
  • Brass constructed with internal ceramic cartridge
  • Dual stainless steel strainers protect against suspended particulate in lines
  • Vandal resistant cap/temperature adjustment handle
  • Temperature control range: 60-140° F.
  • 0.5 gpm - 14 gpm flow rate
  • Durable cast brass body
  • Installation & maintenance instructions included
  • Dual certified for ASSE 1017/1070
  • Click here for dimensions
  • Buy American Act Compliant Buy American Act compliant button

#7-230-CK-FS Mixing Valve With Integral Checks = $156.11

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Symmons Maxline™ Thermostatic Water Temperature Limiting Device #7-210-CK
3/8" Compression Inlets/Outlet

This Thermostatic Water Temperature Limiting valve needs to be sized according to the flow capacity to be required, NOT by the pipe size supplied to the valve. View pressure drop chart

5-210-CK
Features:
  • Mixing valve with integral checks and ultra responsive thermal motor
  • 3/8" compression hot/cold inlets and temperature mixed outlet
  • Dual stainless steel strainers protect against suspended particulate in lines
  • Vandal resistant cap/temperature adjustment handle
  • Stainless steel constructed
  • Ceramic cartridge
  • Temperature control range: 59-113° F.
  • 0.5 gpm - 5 gpm flow rate
  • Installation & maintenance instructions included
  • Click here for dimensions
  • Buy American Act Compliant Buy American Act compliant button

#7-210-CK Mixing Valve With Integral Checks = $89.96

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Frequently Asked Questions

Q. "Where can these valves be installed?"
A. These temperature limiting valves are designed for either residential or commercial use. Thus, they can be installed either at the water heater for whole house protection, or can be installed at point of use as in the case of a locker room with multiple showers. The important thing to remember when determining valve placement is the flow capacity required. Generally, residential applications do not require a high flow rate for one specific room so an "at-the-water-heater" installation is usually preferred to provide scald protection throughout the home. Please note that the Symmons Maxline valve series are NOT recommended for use with emergency showers or eyewash stations.

Q. "I have low water pressure, can I use these products?"
A. ALL of the products on this page will reduce your pressure. These mixing valves will reduce the pressure because of friction loss as the water flows through them, so please refer to the pressure drop charts provided for each valve to ensure you are selecting the right valve to accommodate your pressure needs.

Q. "When installing mixing valves are there any other helpful hints?"
A. We believe that whenever you install a mixing valve after the water heater that you should also install a check valve on the cold side, an in-line screen (such as a wye-strainer) and an expansion tank.

Q. "What are check valves?"
A. Check valves prevent the back flow and cross flow of water. With a check valve water can only flow one direction. Check valves are recommended to prevent by-pass when a Thermixer is installed with a downstream shut-off device.

Q. "What are screwdriver stops?"
A. With stops, it means the valve has shut-offs for the water line so you don't have to shut off water to the entire house to work/repair parts on the shower/tub system.

Q. "What is the quality of Symmons products?"
A. Since the 1930's Symmons has provided superior engineering, and solid workmanship in every product. Product manufacturing, assembly, and handling are subject to strict quality control and only the highest quality materials are selected to ensure durability for years to come.


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