TL;DR
A mixing valve is a plumbing fitting that blends hot and cold water to deliver a set outlet temperature, protecting users from scalding while allowing the water heater to store hotter water. Thermostatic models at the heater let storage sit at 140 degrees F to suppress Legionella while distributing at 120, and point-of-use versions protect tubs and showers per code.
What it means
A mixing valve is a plumbing fitting that blends hot and cold water to deliver a set outlet temperature, protecting users from scalding while allowing the water heater to store hotter water. Thermostatic models at the heater let storage sit at 140 degrees F to suppress Legionella while distributing at 120, and point-of-use versions protect tubs and showers per code. It appears in bids for water heater replacements, especially tankless and high-recovery systems.
Where it sits in the glossary
Mixing valve is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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