What is a tempering valve?
Terry Smith • December 17, 2025
What is a tempering valve? www.americanplumbingla.com
What is a tempering valve?
www.americanplumbingla.com
#americanplumbing
#geriatricgymrat
#temperingvalve
#federalgovernment
#plumbingrepairs
A tempering valve is a plumbing safety device that mixes hot water with cold water to deliver water at a controlled, safe temperature.
What it does
Reduces very hot water from a heater to a preset temperature
Prevents scalding at taps, showers, or fixtures
Keeps water temperature consistent even if pressure or supply changes
Where it’s commonly used
Domestic hot water systems (homes, apartments)
Bathrooms, showers, sinks
Solar and heat-pump water heaters (which often store water at higher temperatures)
Hospitals, schools, childcare centers (where safety standards are strict)
Why it’s important
Water heaters are often set to 60°C (140°F) or higher to prevent bacteria like Legionella
Tempering valves typically reduce outlet temperature to around 45–50°C (113–122°F), which is much safer for skin
How it works (simple)
Hot water enters the valve
Cold water enters the valve
The valve blends them to a set temperature
Mixed water exits to fixtures
Tempering valve vs thermostatic mixing valve (TMV)
Tempering valve: Usually serves an entire house or group of fixtures
TMV: More precise, often used at individual outlets (like a single shower)
How did roots get into this toilet supply line?
Are Casta Diva smart toilets a good option compared to Toto smart toilets?
Checking out a broken 6” sewer tap for repair.
There are some things in life you can fix with duct tape, determination, and a YouTube video. A busted water heater usually ain’t one of them! 😂
Plumbing supply showroom vs. Amazon!
If we say you need a video pipe inspection, you need a video pipe inspection!
Expandable PVC repair couplings will snap and break!
Reducing a 3/4” waterline to 1/2” waterline is another epic wannabe plumber fail!
You ever walked in on your plumber and exposed to his vertical smile?
You do not hire a plumber to rummage through your vehicle!