# Water heaters in series

**URL:** <https://forum.nachi.org/t/water-heaters-in-series/30900>\
**Category:** Plumbing Inspections\
**Created:** [August 12, 2008, 1:26am UTC](https://forum.nachi.org/t/water-heaters-in-series/30900 "2008-08-12T01:26:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bhartley](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/bhartley/32/1448_2.png) [@bhartley](https://forum.nachi.org/u/bhartley)\
**Post date:** [August 12, 2008, 1:26am UTC](https://forum.nachi.org/t/water-heaters-in-series/30900/1 "2008-08-12T01:26:02Z")

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Is a TPR valve required on both water heaters that are connected in series?

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**Author:** ![badair](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/badair/32/166699_2.png) [@badair](https://forum.nachi.org/u/badair)\
**Post date:** [August 12, 2008, 1:45am UTC](https://forum.nachi.org/t/water-heaters-in-series/30900/2 "2008-08-12T01:45:53Z")

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Yes, and they need to plumb the drainlines properly…both of these are wrong…

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**Author:** ![jgilleland](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jgilleland/32/1326_2.png) [@jgilleland](https://forum.nachi.org/u/jgilleland)\
**Post date:** [August 12, 2008, 3:23am UTC](https://forum.nachi.org/t/water-heaters-in-series/30900/3 "2008-08-12T03:23:40Z")

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Wonder how long it will take to blow that first 90 elbow off?