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I replaced my hot water heater and now the hot water doesn't run in any of my faucets. What could be the problem? I did not have to replace any piping from old hot water heater and the water ran fine before replacng with a new water heater.

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    Does ANY water run out of your hot water faucets? Most water heaters have valves to cut-off supply either incoming to the heater and/or outgoing to the house. Have you checked to make sure those are turned on? – nageeb Jun 7 '12 at 4:47
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First step is to assure all valves are open, including the main supply valve. Do you have cold water at faucets?

Second check would be to open the bottom drain on the water heater to see if any water has entered the tank. This will tell us if water is reaching the tank or stopping at the tank.

Do you hear any air passing at the faucets when you turn them on?

Are the connections threaded or solder? Not that makes a lot of difference, but will make it easier to trouble shoot if they are threaded and need to be removed.

When you installed the heater, did you remove all the plastic pipe plugs that are installed for shipping?

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    My vote is one of the plastic plugs is still in there. – Dave Nay Jun 7 '12 at 13:19

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