Hot water gone cold in half of house

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Leigh9

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I'm hoping someone here can offer advice. Yesterday we noticed there was no hot water in the master bathroom (cold in shower and sink). Plenty of water comes out, it's just cold instead of warm. We thought it was the hot water heater, but then today I realized that the kids still have piping hot water in their bathroom (which is the farthest from the hot water heater). So I ran around and checked everything else in the house that uses water, and the kids' bathroom is the ONLY PLACE where hot water still exists.

Kitchen sink: no hot water (one room over from the heater)
Washing Machine: no hot water (in the same room as the heater)
Master bathroom: no hot water (on the other side of the wall from the heater)
Kids' bathroom: perfectly peachy (on the other side of the house from the heater).

Any thoughts?
 

Reach4

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Is it possible there is a second hot water heater?

Feel the output pipe on the water heater. Is it hot or cold?
 

Reach4

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You could feel them both. ;)

Generally it is the one without the shutoff valve. Usually it is on the left as you face the water heater.
 

Jadnashua

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Unless you have more than one WH, the fact that you have hot water in the one bathroom means the WH must be working.

On a valve where you can turn it to all hot, do you still get flow? Single-handle shower valves don't always let you get all hot, and always include some cold.

It's early in the season, but has it been below freezing?

Some valves when they fail can create a cross-over, which will mix the hot and cold...depending on the distance from that point and the relatively resistance (water will take the path of least resistance), it may be easier for cold to get there verses the hot.

Do you have a hot water recycling system? A bad check valve could cause that.
 
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