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Old 02-21-2012, 11:22 PM   #31
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Low hot water pressure


That's what I said when I found this fix on another site.

Should've been more detailed in my instructions. Turn off the feed to the water heater and drain some room off the top of the tank through the flush valve. You'll need to open faucets to get it to drain. If you don't, once you crack that union the water from the pipes above the tank will be all over you and the floor.

Pull pipe off the top of the union and you can look and see if it's clogged.

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Old 04-25-2012, 01:39 PM   #32
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Low hot water pressure


I have similar issues with my hot water pressure. My house is only 8 years old, I have two 50 gallon water heaters in the attic daisy chained for the house. The symptom is when opening any faucet in the house, it starts off strong then instantly goes down 3/4. if you open multiple faucets, it will trickle or not even flow at all.

I have copper pipes throughout the house, and the problem happened suddenly. I called a plumber and at first he said he hadn't seen that issue before (strong then instantly trickle), but he came back and said his boss sees it all the time, that there is sediment in the tanks, and they need to be replaced. I seriously question the replace part. After reading the thread, I will try to flush the tanks this weekend, but wanted to post here with the added symptom of starting strong then a trickle within a second or two.

Could it be sediment in the tanks that clog the screen when the flow starts? Would a flush help in this case?

Thanks for any help you can provide!
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Old 04-25-2012, 02:26 PM   #33
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Low hot water pressure


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Originally Posted by Sandmangs View Post
I have similar issues with my hot water pressure. My house is only 8 years old, I have two 50 gallon water heaters in the attic daisy chained for the house. The symptom is when opening any faucet in the house, it starts off strong then instantly goes down 3/4. if you open multiple faucets, it will trickle or not even flow at all.

I have copper pipes throughout the house, and the problem happened suddenly. I called a plumber and at first he said he hadn't seen that issue before (strong then instantly trickle), but he came back and said his boss sees it all the time, that there is sediment in the tanks, and they need to be replaced. I seriously question the replace part. After reading the thread, I will try to flush the tanks this weekend, but wanted to post here with the added symptom of starting strong then a trickle within a second or two.

Could it be sediment in the tanks that clog the screen when the flow starts? Would a flush help in this case?
Sandmangs,

When you say "when opening any faucet in the house", I assume you mean any "hot" water faucet in the house since your thread is titled "Low hot water pressure".

That being the case and with the symptoms of strong flow and then instantly going down, the problem sounds like a bad heat trap valve on your water heater. The heat trap could be partially clogged with sediment. There's a ball in the heat trap and when it moves off it's seat, to allow water flow, the sediment could be forming another seat on the other end, blocking water flow.

There are heat traps for the hot and cold water lines and either could be bad but the hot one is more suspect since sediment from the heater exits past the hot heat trap.



The heat traps shown are external and can be replaced. There can be heat traps internal to some water heaters but I don't know if they can be replaced.

There may be a way to unclog a heat trap on the hot outlet without doing any plumbing work. If you want to try it, let me know. I've never tried it myself but I think it might work if the clog is fresh.

HRG

Last edited by Homerepairguy; 04-25-2012 at 03:01 PM.
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Old 04-25-2012, 03:17 PM   #34
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Low hot water pressure


Thank you for your thoughtful reply, homerepairguy, I really appreciate it. I will look tonight to see if they are external and try replacing the hot heat trap if external. I'll let you know what I find out.

Thanks again!
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Old 04-25-2012, 09:10 PM   #35
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Originally Posted by Sandmangs View Post
Thank you for your thoughtful reply, homerepairguy, I really appreciate it. I will look tonight to see if they are external and try replacing the hot heat trap if external. I'll let you know what I find out.

Thanks again!
Welcome. BTW, not all water heaters have heat trap valves.
If yours does and you find that an external one is clogged/defective, since plumbing work has to be done anyway, maybe consider tossing the heat trap valves and building heat trap piping instead.


See 16th article down at:
http://waterheatertimer.org/9-ways-t...er-heater.html

Heat trap piping won't ever get clogged by sediment and are almost effective as heat trap valves. Do a google image search on "water heater heat traps" to see different ways to do this.

HRG
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Old 08-16-2012, 04:25 AM   #36
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Low hot water pressure


i had the same problem,and i just fixed my self.
Replace Both (((((((heat trap nipples))))))) cold and hot

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Old 08-16-2012, 10:06 AM   #37
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Low hot water pressure


Quote:
Originally Posted by efowler View Post
Had this problem after flushing my water heater and it was an easy fix. Check the Dielectric Union, which joins the hot water outlet from the tank to the copper pipe. Mine looked like a clogged artery from a heart attach victim ... probably 98 percent restricted. Pull the old one, sweat a new one on and I was done for $4.

They look like this:

http://www.zorotools.com/g/00059328/k-G2993094?utm_source=google_shopping&utm_medium=cpc &utm_campaign=Google_Shopping_Feed&kw={keyword}&gc lid=CMPoit2Grq4CFcrQKgod3UJ0Rw
Why dig up a 3 year old thread???

http://t3.gstatic.com/images?q=tbn:A...tKp5TlPsTpea0Q
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Old 01-13-2013, 08:45 PM   #38
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Low hot water pressure


I know this post is super old but I just wanted to add my 2 cents to anyone googling this problem. I had the same experience as Kyball. I drained the tank and that didn't solve the problem, actually the water was pretty clean.

I turned off the cold water supply and turned on a hot water faucet. I took a wrench and banged the inlet and outlet pipes right above the tank. When I turned the water supply back on I could hear the hot water sputtering and then gushing out! Problem solved.

BTW it is a John Wood tank I have.
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Old 02-26-2013, 01:26 AM   #39
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Low hot water pressure


I had the same issue with low hot water pressure when cold side was fine. A plumber fixing a different problem advised me (wrongly!) that it was my pressure regulator. Replaced that Saturday - no help at all. Sunday I bypassed the water heater with a flex coupler and water came out of the hot faucets, showers etc no problem. So on checking the inlet side to the water heater I discover the little ball in the valve in there is stuck. The stem on it was wedged against the side, so I was getting about 1/4 normal flow. For now I have NO check vale there. Is that a bad idea? At least I now get to have a shower that isn't a pathetic trickle.

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