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Old 02-18-2015, 07:53 AM   #31
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I found swapping out the shower head helped alot. But if your only getting 2 1/2 gallons of hot water you have other issues.
I agree, there are other issues. I've had no problem with my Suburban water heater keeping up. I wonder if the by-pass valve is defective and slightly open?
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Old 02-18-2015, 07:53 AM   #32
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Air in the tank?
It's sounds to me like there's air in the tank.
How did you get the air out of the hw tank when you filled it?
Air will leave the tank when the hot water is turned on. Sounds more like a faulty hi limit thermostat kicking out prematurely.
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Old 02-18-2015, 08:10 AM   #33
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Air will leave the tank when the hot water is turned on. Sounds more like a faulty hi limit thermostat kicking out prematurely.
I don't think it all will as the relief valve is higher then the hw outlet.
But your probably right.
Premature high cut out .

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Old 02-18-2015, 08:14 AM   #34
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Air will leave the tank when the hot water is turned on. Sounds more like a faulty hi limit thermostat kicking out prematurely.
Maybe draw hot only water from the sink and check the temp. should be close to the temp of the hi limit.
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Old 02-18-2015, 08:19 AM   #35
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Air in the tank?
It's sounds to me like there's air in the tank.
How did you get the air out of the hw tank when you filled it?
Open the high temp blow off valve ever so slightly, (wear good gloves) till it spits a stream of hot water. Since its located at or near the top of the HW tank, you know it's full at that point.
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Old 02-18-2015, 08:21 AM   #36
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Open the high temp blow off valve ever so slightly till it spits a stream of hot water. Since its located at or near the top of the HW tank, you know it's full at that point.
Correct.
I'd actually let it cool off completely then relief the system pressure then open the relief valve and turn water back on

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Old 02-18-2015, 08:21 AM   #37
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Straw grasp time, but if you close the cold water inlet to the tank and then try to fill a bucket in the shower, you should get about 1/2" of water as there is no pressure on the hot side, you will basically be depressuring the hot water lines.. If you get flow and pressure, your bypass valve is passing..
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Old 02-18-2015, 08:28 AM   #38
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Correct.
I'd actually let it cool off completely then relief the system pressure then open the relief valve and turn water back on

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Turbs, did I enlighten the oracle of the forum! I'm honored to do so.

Seriously, it's no big deal to purge air from the hot water tank under heat and pressure. Like I said, lift the blow off lever slowly and wear some good work gloves. You will hear it release air from the top of the tank, and then you will get a solid stream of hot water.
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Old 02-18-2015, 08:31 AM   #39
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Air in the tank?
It's sounds to me like there's air in the tank.
How did you get the air out of the hw tank when you filled it?
The tank is designed to have some head of air, otherwise the pump would always run when drawing HW. But your point is well taken - there could be too much air in the tank.
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Old 02-18-2015, 08:20 PM   #40
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Open the high temp blow off valve ever so slightly, (wear good gloves) till it spits a stream of hot water. Since its located at or near the top of the HW tank, you know it's full at that point.
No, don't do that. The air pocket at the top of the water heater is part of the design, allowing expansion and contraction in the system (like the bladders now required by code in homes). It is impossible to have too much air in the tank because the hot water output line at the top regulates how much air is left.
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