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A.O. Smith 4.6-Gallon Expansion Pressure Tank $25.77 @lowes YMMV

$25.77
kivfer Expert
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https://www.lowes.com/pd/A-O-Smit...1000565579
https://brickseek.com/lowes-inven...1000565579
OVERVIEW
Expansion tank for heater overflow works on heaters up to 80 gallon

Powder coated interior shell protects against corrosion, assures long trouble free life

Exterior powder coat paint for long life and anti-corrosion, certified to automotive ASTM standards

Proper tank sizing is critical to the performance of your water heater

NSF and IAPMO approved

If your home was built in 1985 or is newer, you should use an expansion tank

There is a check valve on your meter closing the system and creating negative thermal expansion impact
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Created 07-27-2021 at 08:51 AM by kivfer
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This comment has been rated as unhelpful by Slickdeals users
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#2
Good deal for a specific item. If you can find it for $25.
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#3
Quote from sdaaronr :
Good deal for a specific item. If you can find it for $25.
what is this for? my water heater never needs this. why 1985 or newer? did they mean older?
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Our community has rated this post as helpful. If you agree, why not thank ?
#4
Quote from Lilyly :
what is this for? my water heater never needs this. why 1985 or newer? did they mean older?
https://legacyplumbing.net/blog/w...sion-tank/
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#5
Would also stop that ricochet hammering you hear on some systems when you shut the washer off really quick.

I think these are great idea, I'm definitely going to link for it, at this price 👍👍

Thanks, OP!
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#6
Only two stores have this in the Atlanta area: one has them for $65, the other has "limited stock" for $55.
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#7
My system has an Amtrol ex-30, could I get this and use it when that dies?
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#8
Quote from Lilyly :
what is this for? my water heater never needs this. why 1985 or newer? did they mean older?
I believe the national plunging code was updated in 1985 to require backflow preventers (don't know if that was Canada or US). But even if it was the US, it's only a guide and every local has it's own code. Generally, you only need the tank if you have a backflow preventer, RPZ, or close system. Some PRV's do have bypass's and some don't, but always recommend a tank.
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#9
What's the typical lifespan for an expansion tank?
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#10
Quote from arcasinky :
What's the typical lifespan for an expansion tank?
I just had one rust out and begin spraying water in about 8 years. Seemed like a short life.
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#11
Quote from brages :
I just had one rust out and begin spraying water in about 8 years. Seemed like a short life.
Seems about as long as a water heater then? So, replace the water heater and replace the Pressure tank... I seem to get about 10 years out of mine before they start leaking.
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#12
This thing causes your Flume Water Sensor or water meter continuously running. So if you have Flume Water sensor, it's not going to work. I tried 3 different expansion tank brands. They all did the same thing. I tried Everbuilt from HD, AO Smith from Lowes and high-rated Amtrol and some off-brand. They all caused water meter to running continuously. I called support from one of those manufactures. They said that's normal operation of expansion tank. I want to monitor leak so I took it off and never installed it. I don't think you really need it. It's nice to have.
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#13
Quote from arcasinky :
What's the typical lifespan for an expansion tank?
They normally only have a 1 year warranty. This is basically a ballon in a metal tank. Clorine will break down the ballon and it will rupture leaving you with a useless tank.
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#14
Quote from duijver :
Seems about as long as a water heater then? So, replace the water heater and replace the Pressure tank... I seem to get about 10 years out of mine before they start leaking.
Unless you test it, you don't know if its workiing. It has a value on it similar to a bike/car tire. press it quickly...if water comes out, the ballon inside has ruptured...

For 99.9% of the time, this thing is a joke, because no one checks to see if the ballon is in tact.
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#15
Quote from arcasinky :
What's the typical lifespan for an expansion tank?

Less than 10 years. There is a rubber diaphragm inside that eventually gets a hole in it or wears out. If that happens, there is no protection from thermal expansion and an increased pressure head to your system. This increased pressure can easily ruin faucets as they typically can handle only about 80psi. This is how I found out my expansion tank needed replacement after 8 years. A new kitchen faucet started to leak around the base of the handle because it blew out the gaskets that aren't meant to be replaced. There is a pressure valve on top of the tanks that looks like something on a tire. You should NEVER get water out of that. If you do your tank needs to be replaced.
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Last edited by sdaaronr July 27, 2021 at 11:48 AM.
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