Water pressure tank question

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sndog

Senior Member
Joined
Nov 15, 2022
Messages
244
Is it possible to use a thermal expansion tank as an accumulator tank? I was think of using the following:

www.homedepot.com

Everbilt 2 gal. Thermal Expansion Tank EF-TET-2T - The Home Depot

Built with heavy-duty butyl diaphragm system to absorb the expansion of water volume and help prevent dangerous pressure build-up. This Everbilt Expansion Tank will absorb pressure increases when properly
www.homedepot.com

It is two gallons, but was looking at using 3 of them in my system.

Thank you in advance
 
You want one for drinking water. There is a difference in the construction of the internals. 1 is normally sufficient.
 
Yes, I found the Watts units to work extremely well with several different sizes available. The pictured one is a PLT-20 which gives over 2 gallons of water between pump cycles. Also used the smallest size for water heater expansion.

20201005_172830.jpg


Picture was during the installation process.

Ted
 
I used a pair of the Pro Water Parts tanks in my system. A 5.5 gallon after the pump as a pressure tank and a 2 gallon on the hot water side as an expansion tank. It's worked well and I get somewhere around 1.2 gallons between pump cycles.
 
Flatswing said:
That’s what I used on my 49. But why do you need 3?
Click to expand...
I want one on the water side for the specific reason of protection of the system, as there is a 200k BTU tankless water heater. One is for the pex manifolds that feed midship to aft, the other is to be near the pex manifolds for the midship to bow. They are all connected, but have about 25 to 30 ft between the two, so just to help make the water flow a tad smoother. Though adding another one after the water filter system for the drinking water and ice makers water supplies is a good idea, though I think a smaller one would suffice for that.
 
sndog said:
I want one on the water side for the specific reason of protection of the system, as there is a 200k BTU tankless water heater. One is for the pex manifolds that feed midship to aft, the other is to be near the pex manifolds for the midship to bow. They are all connected, but have about 25 to 30 ft between the two, so just to help make the water flow a tad smoother. Though adding another one after the water filter system for the drinking water and ice makers water supplies is a good idea, though I think a smaller one would suffice for that.
Click to expand...
There's no need for one after the filters (and in my mind, less stuff after the filters is better). The filters should flow well enough that it's a non-issue if they're sized adequately.
 
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