# What tempering strategies keep fixtures safe from Legionella risk after ultra‑low temperature water‑heating?

**URL:** <https://home.renovation.reviews/t/what-tempering-strategies-keep-fixtures-safe-from-legionella-risk-after-ultra-low-temperature-water-heating/20003>\
**Category:** Trade Talk\
**Tags:** safety\
**Created:** [August 4, 2025, 3:20pm UTC](https://home.renovation.reviews/t/what-tempering-strategies-keep-fixtures-safe-from-legionella-risk-after-ultra-low-temperature-water-heating/20003 "2025-08-04T15:20:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![reno\_questions](https://home.renovation.reviews/user_avatar/home.renovation.reviews/reno_questions/32/2758_2.png) [@reno\_questions](https://home.renovation.reviews/u/reno_questions)\
**Post date:** [August 4, 2025, 3:20pm UTC](https://home.renovation.reviews/t/what-tempering-strategies-keep-fixtures-safe-from-legionella-risk-after-ultra-low-temperature-water-heating/20003/1 "2025-08-04T15:20:34Z")

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What tempering strategies keep fixtures safe from Legionella risk after ultra‑low temperature water‑heating?

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**Author:** ![Tim\_Michael1](https://home.renovation.reviews/user_avatar/home.renovation.reviews/tim_michael1/32/6294_2.png) [@Tim\_Michael1](https://home.renovation.reviews/u/Tim_Michael1)\
**Post date:** [August 13, 2025, 6:14pm UTC](https://home.renovation.reviews/t/what-tempering-strategies-keep-fixtures-safe-from-legionella-risk-after-ultra-low-temperature-water-heating/20003/2 "2025-08-13T18:14:50Z")

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To save energy, some set water heaters super low, but this can cause Legionella bacteria to grow. Here’s how to keep things safe:

- **Faucet Valves:** Mix cold water with the hot water at each faucet or shower to make sure the water is hot enough (over 120°F).
- **Central Valves:** Mix cold water at the water heater so the water stays hot enough to prevent bacteria growth, while still saving energy by storing water at a lower temp.
- **Regular Hot Flushes:** Heat water to 140°F every so often to kill bacteria.
- **Shorten Pipes:** Avoid long, unused pipes where water sits. Move water through the lines often.
- **Check Temps:** Keep storage temps low to save energy, but be sure the water from your tap is never in the danger zone (77–113°F).

The main thing is to store water at a low temp to save energy, but always mix it or move it around, so your tap water is hot enough to stop Legionella.

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**Author:** ![Bobby\_Michael](https://home.renovation.reviews/user_avatar/home.renovation.reviews/bobby_michael/32/2057_2.png) [@Bobby\_Michael](https://home.renovation.reviews/u/Bobby_Michael)\
**Post date:** [August 13, 2025, 7:24pm UTC](https://home.renovation.reviews/t/what-tempering-strategies-keep-fixtures-safe-from-legionella-risk-after-ultra-low-temperature-water-heating/20003/3 "2025-08-13T19:24:10Z")

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To keep fixtures safe from Legionella risk after ultra-low temperature water heating, maintain hot water temperatures above 60°C (140°F) in storage tanks and above 50°C (122°F) in circulating systems to effectively kill Legionella bacteria. For cold water systems, keep temperatures below 20°C (68°F) to prevent bacterial growth.

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**Author:** ![Theodore\_3456](https://home.renovation.reviews/user_avatar/home.renovation.reviews/theodore_3456/32/2821_2.png) [@Theodore\_3456](https://home.renovation.reviews/u/Theodore_3456)\
**Post date:** [August 13, 2025, 7:47pm UTC](https://home.renovation.reviews/t/what-tempering-strategies-keep-fixtures-safe-from-legionella-risk-after-ultra-low-temperature-water-heating/20003/4 "2025-08-13T19:47:26Z")

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Use thermostatic mixing valves and maintain ≥60 °C in storage with ≥50 °C at outlets, flushing regularly to prevent Legionella growth.