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Old 10-26-2012, 05:23 PM   #1
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Inconsistent hot water


The hot water in the master bathroom (sinks/tub/shower) is warm for a while and then goes cold (or almost hot, but never long enough to shower - it's very inconsistent). If you turn on any other faucet in the house the water is very hot, so it isn't a problem with the available supply. The master bath is the furthest from the water heater, but we have a recirculating pump. The house is 10 yrs old and this has just recently become a problem. Could there be a blockage or maybe I need a new pump. No matter how long I run the water, a consistent flow of hot never gets there.

Any insight and/or advice is greatly appreciated!

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Old 10-26-2012, 11:29 PM   #2
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Inconsistent hot water


Sounds like the pump is either seized or dead. Can you confirm if it's working?

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Old 10-27-2012, 12:52 PM   #3
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Inconsistent hot water


It seems to be working. Could it have lost some of its power and not be strong enough to recirculate through the entire house? All other faucets have instant hot water.
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Old 10-27-2012, 03:05 PM   #4
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Inconsistent hot water


How did you determine that your pump seems to be working? Is your water piped in as a trunk & branch system or a manifold system?
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Old 10-27-2012, 03:50 PM   #5
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Inconsistent hot water


There is a recirculating pump next to the hot water heater. The reason I assume it is working (at least partially) is that the kitchen has instant hot water and when the pump isn't on, you have to wait a few minutes for it to get hot. I have absolutely no idea reagarding trunk & branch vs manifold. I'd use being female as an excuse, but the men I asked didn't know either - lol.
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Old 10-27-2012, 09:30 PM   #6
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Inconsistent hot water


do you have single control faucets in master bath,...if you do it could be a cross over ...ben sr
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Old 10-30-2012, 02:35 PM   #7
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Inconsistent hot water


I have single control in the shower and the sinks/tub have dual controls so that's probably not the problem, but thanks.
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Old 10-30-2012, 02:55 PM   #8
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Inconsistent hot water


could be a stuck or non working check valve in the recirculating line.
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Old 10-30-2012, 03:40 PM   #9
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Inconsistent hot water


I think it's the single handle shower cartridge. The pump keeps the hot loop hot so you don't have to wait for the water to get hot at your point of use. But it's not getting hot at the master bath like it does at other places( kitchen). Cold water is crossing over at the shower affecting only that bathroom.

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