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  Reply # 1593351 15-Jul-2016 20:28
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It works the same as a car thermostat. If working properly it keeps the outlet temperature the same no matter how hot the inlet temp is. So if the cylinder is not very hot. It simply passes the cylinder temp to the outlet. Surprised the plumber didn't replace it. It is common for them to fail. But often they will jam on full hot and the customer doesn't notice they have 60deg water to their taps instead of 55deg.

At least one tempering valve manufacturer recommends that their valves be replaced every 5 years. So that is why I just normally replace them. I'm a plumber myself.





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  Reply # 1593393 15-Jul-2016 21:35
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The temperature at the top of the cylinder should be at least 65 to prevent legionella

 
 
 
 


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  Reply # 1593702 16-Jul-2016 22:18
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Hopefully your plumber put in a tempering valve that is rated for a solar system. The water temperature in a solar system can get to 100 degrees on a hot day and will fry a standard tempering valve.

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