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We just brought a new water heater and everything inside such as elements and the thermostats are all perfectly working.

The wiring is all good and the connections are all good but the water heater still doesn’t make hot water.

Any ideas on how to diagnose the problem?

Alaska Man
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  • Does it have sufficient water pressure? – Solar Mike Dec 05 '20 at 20:08
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    How do you know everything is "perfectly working" if it doesn't make hot water? – tnknepp Dec 05 '20 at 20:09
  • Was it hooked up backwards? I would agree with @tnknepp. – Ed Beal Dec 05 '20 at 20:15
  • @EdBeal How can it be hooked up backward? Heating elements shouldn't care if hot and neutral are swapped, should it? – tnknepp Dec 05 '20 at 20:19
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    Perhaps Ed was asking if the water connections are "backwards" ? – Alaska Man Dec 05 '20 at 20:49
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    Perhaps this question will provide some helpful info. https://diy.stackexchange.com/questions/14467/did-the-plumber-hook-up-my-water-heater-backwards – Alaska Man Dec 05 '20 at 20:54
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    Yeah, check to make sure you've hooked the water supply to the cold water port and the hot water line to the outlet port -- if you get the water lines backwards, hot water will basically "short circuit" around the water heater, and you'll get lukewarm water out at best – ThreePhaseEel Dec 05 '20 at 22:33
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    Yes I was talking about the water connections there is a supply line and a output of these are backwards you guessed it the water heater won’t work correctly. – Ed Beal Dec 05 '20 at 23:04
  • One of the things you cited in your question (elements, thermostats, wiring, connections) are **NOT** "all good". How about some pics? – Jimmy Fix-it Dec 06 '20 at 01:16
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    be sure you have the hot and cold connections correct. The cold water supply MUST be connected to the cold side. tank type water heaters have a "dip tube" that directs the cold water to the botttom of the heater. If your plumbing connections are reversed, the best you would get is luke warm water. – George Anderson Dec 06 '20 at 02:17

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