Hot Water Problem

 
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Old 12-12-2017, 08:13 PM   #1
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Hot Water Problem


I am in the process of finishing a new house. I did not rough in the plumbing in the house. i am just installing hardwood, tiles and finishing the bathrooms. installing vanities, toilets and shower heads and such. i am having a hard time with air in the water lines. cant figure out where it is coming from. if the hot water sits for a few hours, when you turn a tap on it will spit and sputter until the air is out of lines. i have tried shaking the hot water tank to see if maybe there was air trapped in it. but no go. i tried letting all the taps in the house run for 30 minutes. no good.

Not sure where the air is coming from. The cold side has no issues. It is a well with a pressure tank and its not a jet pump. the pump is in the well pipe. If i let it sit for a couple of days it takes a few minutes to get all the air out and stop the spitting. then its good for a few hours again if you use it.

I need some help.
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Old 12-12-2017, 08:18 PM   #2
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Re: Hot Water Problem


Is it possible that the water heater is running hot enough to boil?

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Old 12-12-2017, 08:22 PM   #3
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Re: Hot Water Problem


i was thinking something along those lines. i hear the water heater gurgling when it is heating. but was not sure it was supposed to or not. its electric. is it adjustable? its brand new and would think it would be set right from factory. If its adjustable i guess it would be under one of the panels? i will check when I'm at the house next.
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Old 12-12-2017, 08:32 PM   #4
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Re: Hot Water Problem


Yeah, they often gurgle; that's not a bad thing per se. Yes, there's always an adjustable thermostat. But if it's overheating enough to create that big of an air pocket, the T&P valve should blow off.

Probably best to see what your plumber has to say.
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Old 12-13-2017, 09:58 AM   #5
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Re: Hot Water Problem


Maybe dissolved gasses coming out when it gets heated.
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Old 12-13-2017, 10:54 AM   #6
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Re: Hot Water Problem


faulty or temp set to high at t-stat and/or faulty blow off valve.

Electric HW tanks can sometimes have two t-stats to adjust (an upper and a lower). Remove the cover/s and take a look at the settings. Maybe check the water temps but if it's scalding (which could cause boiling) you should know it.
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Old 12-13-2017, 06:27 PM   #7
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Re: Hot Water Problem


Shut the water heater down and see if it continues.

There is a good possibility that there is a high spot that is trapping air and releasing it slowly.

I have had hydraulic systems where I had to back flush them to get the air bubbles out. Bottom (Bleeder) to top (reservoir).
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Old 12-13-2017, 09:32 PM   #8
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Re: Hot Water Problem


i will look at the temp setting and adjust if needed. but to the touch the water is not overly hot. if it looks good i will try shutting the tank off for a few days and see if that clears it up. then i will know if it is coming from the tank or not anyways.

Thanks guys
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Old 12-14-2017, 06:14 AM   #9
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Re: Hot Water Problem


Maybe try draining the tank, open the TPR valve.
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Old 12-14-2017, 09:28 PM   #10
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Re: Hot Water Problem


Any chance you are in Oil sand country? any Natural gas in the water, coal seams penetrated by the well bore?

Can you ignite the gases?
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Old 12-20-2017, 04:53 PM   #11
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Re: Hot Water Problem


A damaged/ wore out heating element, shorting partially to the water, creating O2 and H2 gases? Check for Voltage on tank metal when it is heating water, some tanks alternate elements so you have to run enough hot water or just temporarily raise the set temperature(s) on two thermostatic switches.
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Old 01-12-2018, 09:56 PM   #12
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Re: Hot Water Problem


when submersible pump runs, is it drawing water level in well casing down far enough/fast enough where it's drawing some air along with the water?

or, the check valve on top of your submersible might not be holding well, allowing water to run back into well, and everytime pump kicks in, it's pushing that slug of air ahead of the water
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Old 01-13-2018, 05:48 AM   #13
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Re: Hot Water Problem


Quote:
Originally Posted by dayexco View Post
when submersible pump runs, is it drawing water level in well casing down far enough/fast enough where it's drawing some air along with the water?

or, the check valve on top of your submersible might not be holding well, allowing water to run back into well, and everytime pump kicks in, it's pushing that slug of air ahead of the water
That happened on one of my jobs, a small hole in the pipe at the check valve
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Old 01-31-2018, 01:13 PM   #14
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Re: Hot Water Problem


That sounds frustrating.

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Old 01-31-2018, 01:23 PM   #15
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Re: Hot Water Problem


Quote:
Originally Posted by will-b View Post
That sounds frustrating.

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Wow, what an insightful post that is. We had No idea it was frustrating. Man, am I glad you cleared that up.

Sheesh. With that post, I bet you millions will be clicking on that link. Wow. I'm speechless.

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Old 01-31-2018, 06:15 PM   #16
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Re: Hot Water Problem


coming from a supposed plumber too ? whaa ?

I wonder how Bob made out. Or will this be another dead-end thread.
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Old 01-31-2018, 10:23 PM   #17
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Re: Hot Water Problem


I am guessing that when all the water is turned off the water is leaking from the water heater back into the well. When the water is being heated it expands, vapor bubbles are created and when the water runs back into the well an air pocket on top of the water heater is created.

Think of a water heater being exactly the same as a glass coffee percolator. When the water in the glass percolator heats you see big air bubbles rising from the very bottom of the pot and bursting at the top. When old water heaters are heating you can heat the sediment rocks rumbling at the bottom of the heater and customers think their water heaters are going to explode.

With this electric water heater, the water pressure probably drops fairly low when everything is turned off, the water is draining backwards and when the water is being heated some vapor bubbles are created at the top of the water heater and the bubbles of air trapped.

I would put a good spring-loaded check valve on the cold side of the water heater and a pressure-tank is an absolute necessity to prevent from having an explosion. I have seen many temperature and pressure relief valves clog up with corrosion and fail to open just before the bottom of a water heater blew apart. Recently, there was a fairly new Bradford White water that exploded, blew down some walls and if anyone was around they would have been killed. The water heater had a new pressure relief valve on it. The hole in the heater was large enough to put your head inside.
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Old 02-01-2018, 03:04 PM   #18
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Re: Hot Water Problem


IMHO: Any residential water system needs an expansion tank when ever a one way valve or back flow preventor is used.

Catch pans for HW heaters etc ought to be standard. Along with max pressure regulators on supply lines.... Anti hammer devices on washing and dishwasher supply fixtures......

Water ruins far more homes then fire does now.

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