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Old 09-22-2011, 09:10 AM   #1
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Luke warm Hot water


The hot water flow pressure at the bathroom sink is normal and its temperture is normal for hot water. In the same bathroom the hot water flow at the tub has normal flow pressure but the temperture is only luke warm. This is a single handle control. There does not seem to be an external "scalding prevention adjustment" at the tub. Is it possible such an adjustment is on the plumbing inside the wall or might I have a faulty mixing control that is allowing cold water to enter even though the handle is calling for all hot. Any insight or ideas will be appreciated.

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Old 09-22-2011, 09:17 AM   #2
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Luke warm Hot water


Do you know the brand and model of the tub valve?

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Old 09-22-2011, 09:24 AM   #3
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Luke warm Hot water


No I do not. The problem is in a house that my church is doing repair work in and I will not have access to the house again until Saturday. I was hoping to have some new ideas before then or a confirmation that it might be a faulty mixer.
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Old 09-22-2011, 09:36 AM   #4
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Luke warm Hot water


What kind of repair work is being done?

It's possible that the hot side of the cartridge is partially blocked.

Normally if it has a temp limit, it's underneath the handle, or we put a mixing valve at the water heater to temper all hot water to 120F

Those valves should be left accessible, it shouldn't be under the tub deck or anything like that. I'd start with pulling the cartridge out and making sure it's clear.
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Old 09-22-2011, 09:51 AM   #5
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Luke warm Hot water


Because the hot water pressure at the tub and sink are the same (normal) I do not believe there is a blockage. There is no temp limit control visible at the tub and the water temp in the rest of the house is normal.
There has been no work done to the plumbling or anything else in the bathroom. The luke warm water is just one of the items I have asked to investigate.
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