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Old 04-22-2012, 09:47 AM   #16
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Installation and support of water heater expansion tanks.


This looks like a good way to do it.

http://www.qriquality.com/wp-content...nsion-tank.jpg



I looked through google images and I can't find any pictures of them the way we install them. I guess i'll have to take a picture of the next one I do.


On new homes we stub the cold water out a little further to the right side than where the nipple on the tank would be, that gives a little more room for a valve and a nipple and a flex supply.

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Old 04-22-2012, 09:54 AM   #17
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Installation and support of water heater expansion tanks.


Wow. . . . . .



http://www.nachi.org/forum/attachmen...k-dsc00831.jpg
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Old 04-22-2012, 10:54 AM   #18
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Installation and support of water heater expansion tanks.


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I really enjoy your pictures of your work- exceptional craftsmanship
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Old 04-22-2012, 12:56 PM   #19
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Installation and support of water heater expansion tanks.


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I really enjoy your pictures of your work- exceptional craftsmanship
I should throw that over on the electrical forum and see what those guys have to say about it.
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Old 04-22-2012, 01:19 PM   #20
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Installation and support of water heater expansion tanks.


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I should throw that over on the electrical forum and see what those guys have to say about it.
Some of us have been watching you.
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Old 04-22-2012, 01:56 PM   #21
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Installation and support of water heater expansion tanks.


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Support???

Yes, in my personal view, the horizontal method of supporting an expansion tank is good, provided that the attachment of the strap to the wall is solid. Even if the bladder fails and the tank gets full of water, the tank is supported by the strap without putting any stress on the copper pipes, fittings and solder joints. All of the copper is free to move (contract as cold water refills the water heater and expand as water is heated to the max temperature set by the user).

I've read that installing expansion tanks in the horizontal position can wet only the lower portion of the bladder and with uneven wetness of the bladder cause premature failure of the bladder. But I don't think that theory is cause for concern because of how the air bladder in the tank works.

When the tank is pre-charged before installation, the internal air bladder is pressed entirely up against the insides of the tank right up to the water input hole. IOW, the bladder is like an internal coating on the tank. When water enters the tank, it appears to me that the water will be wetting almost all of the bladder with just a very small air pocket if any.

The disadvantage of a horizontal installation is that the tank cannot be drained completely for removal if the internal bladder ruptures and the tank gets full of water.

(Oh, I just realized after typing the above that maybe your posting that picture was a tongue in cheek post for inadequate attachment of the strap to the wall. )

Thanks,
HRG

Last edited by Homerepairguy; 04-22-2012 at 02:57 PM.
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Old 04-22-2012, 02:45 PM   #22
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Installation and support of water heater expansion tanks.


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Originally Posted by hammerlane View Post
repairguy:

was this how you used a shelf to support yours on the horizontal installatin?

No, my installation looks like this:

Support for the horizonal shelf is by the diagonal cut sides that extend upward. There's a 3/4" vertical back piece that the sides attach to forming sort of a diagonally cut box. The 3/4" vertical back is screwed to the wall. There's a 6.5" hole in the bottom shelf that goes up 1/4" and then tapers to 9" on the top side of that shelf. This allows the convex bottom of the tank to sit on the tapered portion and allows the hex nut at the water connection to be below the bottom of the shelf. This allows complete access of the hex nut with a wrench in every direction up to the wall. Here's some detail of the shelf:
Code:
 
   ---- 3/4" vertical back piece to attach to wall.
  /
 --
|  |\
|  | \
|  |  \
|  |   \
|  |    \
|  |     \
|  |      \
|  |       \
|  |        \
|  |         \
|  |          \
|  |           \
|  |            \
|  |             \
|  |              \
|  |               \
|  | |<----9"----->|\
|  |--             --
|  |  \           /  |
|  |   |         |   | -- hole goes up 1/4" and then 
 --------------------  -- tapers to 9" at the top.
       |<--6.5"->|
|<-------12"-------->|

The picture is not to scale and the angle of the diagonal is not as steep as shown. The bottom shelf is 3/4" plywood. The vertical piece that attaches to the wall is 3/4" plywood and is 11.5" high. Everything was glued and held together using nails.

Allan's method of mounting the tank on a brass tee on the cold water nipple to the heater is much simpler. However, even if I knew that when I installed our expansion tank it wouldn't have worked for us though. The company who installed our solar water heating system installed an anti-scald valve that connects the cold to the hot directly above the water heater using all copper pipes. I had to tee off above that assembly to access the cold water input to the heater.

Hope this helps,
HRG

Last edited by Homerepairguy; 04-22-2012 at 11:08 PM.
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Old 04-22-2012, 05:58 PM   #23
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Installation and support of water heater expansion tanks.


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No, my installation looks like this:

Hope this helps,
HRG
No your installation looks like a bunch of lines and dots.
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Old 04-22-2012, 08:46 PM   #24
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Installation and support of water heater expansion tanks.


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Old 04-22-2012, 09:26 PM   #25
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Installation and support of water heater expansion tanks.


Quote:
Originally Posted by hammerlane View Post
No your installation looks like a bunch of lines and dots.
Sorry about that. While the picture looks fine on my desktop PC, I just looked at them using my laptop and now see that this forum does not display them the same way on different computers. Here's a photoshop picture with dimensions:



(Edited side panels in picture to match actual shelf that I built.)

Hope "this one" helps,
HRG

Last edited by Homerepairguy; 04-23-2012 at 05:03 PM. Reason: Corrected picture of shelf to match actual shelf.
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Old 04-23-2012, 06:12 AM   #26
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Installation and support of water heater expansion tanks.


If your expansion tank is hung vertically, you could always use the 3/4 copper hangers secured to the underside of the subfloor to help support the copper pipe in the area of the expansion tank.
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Old 04-23-2012, 06:24 AM   #27
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Installation and support of water heater expansion tanks.


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If your expansion tank is hung vertically, you could always use the 3/4 copper hangers secured to the underside of the subfloor to help support the copper pipe in the area of the expansion tank.

Looks good. Thanks,
HRG
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Old 04-23-2012, 06:40 AM   #28
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Installation and support of water heater expansion tanks.


For the horizontally mounted tank and strap wrapped around it, the higher above the tank the strap is fastened to the wall, the more secure the fastening is.
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Old 04-23-2012, 01:54 PM   #29
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Installation and support of water heater expansion tanks.


We put one of these in along a horizontal section of cold water pipe that branched off from the water heater feed and supplied a section of the house. It was the smaller 2.1 gallon DET-5 model, configured vertically with the outlet facing down.

Given that the most the tank could weigh when full is about 20 pounds (23.8 pounds, to be precise), we figured that strapping the tank to the wall, and supporting the horizontal 3/4 copper pipe along that same wall should be sufficient. The line going to the expansion tank does angle out from the horizontal pipe, so there is some torque on the horizontal pipe, but that is minimized by strapping the tank to the wall.

Last edited by M3 Pete; 04-23-2012 at 02:00 PM.
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Old 04-23-2012, 02:35 PM   #30
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Installation and support of water heater expansion tanks.


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Originally Posted by M3 Pete View Post
We put one of these in along a horizontal section of cold water pipe that branched off from the water heater feed and supplied a section of the house. It was the smaller 2.1 gallon DET-5 model, configured vertically with the outlet facing down.

Given that the most the tank could weigh when full is about 20 pounds (23.8 pounds, to be precise), we figured that strapping the tank to the wall, and supporting the horizontal 3/4 copper pipe along that same wall should be sufficient. The line going to the expansion tank does angle out from the horizontal pipe, so there is some torque on the horizontal pipe, but that is minimized by strapping the tank to the wall.
Periodic inspections of the tightness of the strap might be a good thing. I don't have a clue if this is a valid concern but am wondering if the daily expansion and contraction of the tank might loosen the strap just enough to allow the tank to slide down a bit at a time every time the tank is cooled.

HRG

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