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Model # DET-5

Internet #100677607

Store SKU #594885

null 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
0098268679892

8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank

  • Protects water heater from thermal expansion
  • Thermal expansion may void water heater warranty
  • Required by code in most areas
$39.97 /each

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Product Overview

You're sure to have hot water when you need it with the Watts Pre-Pressurized Steel Water Expansion Tank. Made from strong, durable steel, this tank can be used with gas, electric or oil heaters. An expansion membrane prevents air and water contact, with a rubber diaphragm that flexes when water heats.

California residents: see   Proposition 65 information

  • Compatible with gas, oil and electric heaters
  • Steel construction with a blue outer finish
  • Tank fitted with expansion membrane to ensure long system life by preventing air and water contact
  • Rubber diaphragm flexes when water heats
  • Maximum 150 psi
  • Maximum temperature is 200 Degree F
  • Note: Product may vary by store

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Customer Questions & Answers

37 Questions57 Answers

Customer Questions & Answers

8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank

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This question is from 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
 
3 answers

I have a 40Gal hot water heater that the pressure relief valve is leaking through the pipe onto the floor

This question is from 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
Asked by
Aaron
Suffolk
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October 6, 2015
I have a 40Gal hot water heater that the pressure relief valve is leaking through the pipe on to the floor. We just purchased this house and know the heater is only about 5 years old. I assume I should replace the Pressure relief valve and also install a expansion tank, however it was installed with PEX all the way to the heater both cold and hot lines. My question is, what size expansion tank should I get? Can I tap into the PEX and hang the tank some how? I can see this is going to be expensive, not only to buy the tank and valve but also the PEX crimp tool and whatever else I will need to install it.
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Asked by
Snipper
Antelope Valley, CA
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August 27, 2016
Answer: 
If your pressure relief valve is leaking on to the floor, please replace it as soon as possible. This valve is a safety device to prevent dangerous overpressuring the tank causing it to blow up. If this happens the water heater can spew scalding water on everything and everyone within range with devistating effects and injuries.
As far as the crimping tool cost, contact Home Depot in their tool rental Read More
If your pressure relief valve is leaking on to the floor, please replace it as soon as possible. This valve is a safety device to prevent dangerous overpressuring the tank causing it to blow up. If this happens the water heater can spew scalding water on everything and everyone within range with devistating effects and injuries.
As far as the crimping tool cost, contact Home Depot in their tool rental department and see if they have this tool available. Other tool rental yards would be another source.
The size of the expansion tank should be tied to the size of the water heater. Look up the manufacture of your W/H on the internet and size to their specifications. Read Less
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Asked by
WattsWater
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October 8, 2015
Answer: 
The tank should be large enough for your application. Watts Quick Connect push on fittings can be used on our WaterPex pipe. They don’t require any special tools to install. Make sure the pipe is properly supported on both sides of the tank as it will get heavier when water expands into it.
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Asked by
Chris
South East Michigan
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Home Improvement Profile: DIYer
October 8, 2015
Answer: 
The 8.5" x 11.5" x 8.5" expansion tank is the correct size for a 40 gallon hot water heater.
The installation should not be difficult depending on the space you have around your hot water heater. Pick up a compression fit T and a short piece of PEX. Make sure the compression fit T comes with inserts to stiffen up the PEX that is pushed into the T. Secure the tank and connect the short piece of Read More
The 8.5" x 11.5" x 8.5" expansion tank is the correct size for a 40 gallon hot water heater.
The installation should not be difficult depending on the space you have around your hot water heater. Pick up a compression fit T and a short piece of PEX. Make sure the compression fit T comes with inserts to stiffen up the PEX that is pushed into the T. Secure the tank and connect the short piece of PEX.
Supplies you'll need:
Expansion tank
Compression fit T with inserts (my job required 3/4" x 3/4" x 3/4")
Short piece of PEX to run to the tank
Coupling for the tank: Threaded on one end and compression fit on the other
If they are not already in line, compression fit shut off valves to isolate the hot water heater. Not necessary, but recommended for future repairs/replacement of your hot water heater.
Also, since you will probably have to drain the water from your house for this job, it is a good idea to flush your hot water heater and check the anodes in the tank. There are youtube videos on how to perform these tasks. Depending on how hard your water is, at 5 years, you may want to replace the anode(s) to extend the life of your hot water heater. Read Less
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This question is from 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
 
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How do you pressurize the tank? Is there an adapter that is neede to add pressure to the tank?

This question is from 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
Asked by
Anonymous
September 15, 2014
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Asked by
WattsWater
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October 6, 2014
Answer: 
Please see the community answer, which gives an in depth answer to your question. Please let us know if you have any other questions or concerns. Thank you, Watts Retail Group Customer Service
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Asked by
JohnV
Atlanta, GA, USA
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Home Improvement Profile: DIYer
September 16, 2014
Answer: 
The tank is ready to install. It is pre-pressurized at the factory. Just in case, here are some steps to take to re-charge.
Set the expansion tank on a flat and level surface.
Determine the proper pressure for your expansion tank. This will depend on the size of your water heater and the temperature of the water inside. You can usually find this information in your water heater owner's manual.
Locate Read More
The tank is ready to install. It is pre-pressurized at the factory. Just in case, here are some steps to take to re-charge.
Set the expansion tank on a flat and level surface.
Determine the proper pressure for your expansion tank. This will depend on the size of your water heater and the temperature of the water inside. You can usually find this information in your water heater owner's manual.
Locate the recharge valve on the expansion tank. They are usually placed at the bottom of the tank. Remove the valve cover.
Slip a standard tire gauge over the valve. Make a note of the reading. Remove the gauge.
Attach a bicycle pump or electric pump over the recharge valve. Start the pump. Check the pressure inside the tank as you pump with the gauge. Stop pumping when the pressure inside the tank reaches the recommended level.
Replace the valve cover. Read Less
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Asked by
Edward
Glen Burnie, MD
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September 16, 2014
Answer: 
Comes pressurized to save you the trouble
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This question is from 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
 
3 answers

can it be mounted inverted?

This question is from 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
Asked by
doug
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July 20, 2014
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Asked by
Harmon20
Arkansas
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Home Improvement Profile: DIYer
October 30, 2015
Answer: 
The instructions that come with the unit show it oriented vertical with supply up or down and horizontal. The only limitation is support. When in the vertical orientation the plumbing supports the weight through the supply line. When horizontal this puts dangerous forces on the supply pipe so the tank needs extra support capable of holding the weight of the water, around 25lbs max.
Orientation doesn't Read More
The instructions that come with the unit show it oriented vertical with supply up or down and horizontal. The only limitation is support. When in the vertical orientation the plumbing supports the weight through the supply line. When horizontal this puts dangerous forces on the supply pipe so the tank needs extra support capable of holding the weight of the water, around 25lbs max.
Orientation doesn't matter for the reasons stated by JohnV. Think of this as nothing more than a fat section of pipe. It simply has a flexible partition inside it, unlike all the other pipe in your system. Pipe don't care which way it is oriented, this won't either. Read Less
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Asked by
Chris
South East Michigan
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Home Improvement Profile: DIYer
October 8, 2015
Answer: 
Yes
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Asked by
JohnV
Atlanta, GA, USA
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Home Improvement Profile: DIYer
July 21, 2014
Answer: 
The expansion tank is a rubber bladder that contains air that can be compressed when the water in the plumbing system expands due to an increase in heat. It should not matter whether the tank is sideways, or inverted. I have seen it installed sideways and the water system worked fine for years. I believe any inversion would still cause the tank to work the way it was designed. Hope this hepls.
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This question is from 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
 
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What is the preset pressure in the tank?

This question is from 8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank
Asked by
Charlie
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May 4, 2014
What is the preset pressure? My system pressure is ~40 psi, what's the appropriate tank pressure for it?
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Asked by
Harmon20
Arkansas
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Home Improvement Profile: DIYer
October 30, 2015
Answer: 
The label on the side of mine, purchased 2015-10-28, says the following:
printed 12/14
Model DET-5-M1-HD
Air Pre-charge 40
Max Air Charge 80
Max Working (water) 150
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Asked by
Sonumb
Marietta
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June 10, 2014
Answer: 
Measured the static PSI of my water system then set tank pressure to be slightly higher than the water pressure.
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Asked by
WattsWater
Retail Group
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May 9, 2014
Answer: 
Hi Charlie,
The DET-5 comes precharged at 20 psi.
If you need any other specs, they can be found here:
http://www.watts.com/pdf/ES-DET-M1.pdf
Hope this helps!
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Customer Reviews

8.5 in. W x 11.5 in. D x 8.5 in. H Pre-Pressurized Steel Water Expansion Tank is rated 4.4 out of 5 by 56.
Rated 5 out of 5 by from Solves relief valve leaks from hot water expansion. After installing our new hot water heater (from Home Depot). I saw that when the tank heated the water, expansion of the water occurred, causing the relief valve to leak water. I installed a water expansion tank and the problem was solved. This also added a surprised second fix. . .. . the water pipes would knock when the toilets would shut off, this reduced that noise, sometimes eliminating it completely. . . cool. Follow the directions, air the tank prior to installation, to what your water pressure is. . . See the photo of our installation. . .as you scroll over the photo you will notice we were restricted on room - but it worked nicely.
Date published: 2013-02-13
Rated 5 out of 5 by from Fixed Hot Water Heater Relief Valve Leak My hot water heater's relief valve was leaking, and I replaced it. Unfortunately, the new one exhibited the same problems. A pressure gauge on the hot water heater determined that my home's water system was closed, and the relief valve was just doing its job. I installed this expansion tank on the cold water line going into the hot water heater. It lowered the pressure and resolved my dripping relief valve problem. Please be aware that you will have to pressurize this tank yourself, before you install it, based upon your water system's pressure. I had do 5-6 wraps of Teflon Tape to prevent it from leaking.
Date published: 2014-01-08
Rated 5 out of 5 by from Installation was a breeze. My old expansion tank sprung a leak. After I turned off the circuit breaker and main water and did some quick online homework, I purchased this tank as a replacement. I also purchased a water pressure tester, which you have to use to install the tank. Installation was very easy, requiring a bicycle air pump, tire pressure gauge to check your inflation, teflon tape, and a large wrench. This is handy info for someone who has to do an emergency repair like I did.
Date published: 2012-09-27
Rated 5 out of 5 by from Great Product This product is great. You MUST check the water pressure in your home with a pressure gauge ..(usually 55 psi ).. you can buy a spicket pressure gauge for about 10 bucks. Then you MUST put that much air in your tank if your water pressure is 55 psi then you need 55 lbs of air in the tank. If you fail to do this and hook it up as you buy it at 20 lbs of air in this tank it will fail pre mauture. You also must turn off water to your water heater once a year and open a faucet till it stops and check this tank pressure with tire pressure gauge once a year (write the water psi on the tank so you know how much air has to be in tank). If installed correctly this tank is great :))
Date published: 2012-02-18
Rated 5 out of 5 by from Solved my hot water heater T & P Valve leak problem My Temp & Pressure valve on my hot water heater would leak after using a lot of hot water, such as after a bath or shower. I replaced the valve and it still leaked. After doing some research on the problem, I determined it to be thermal expansion and purchased this product. After installation it solved my problem, no more leak.
Date published: 2012-04-20
Rated 5 out of 5 by from Happy Hot Water Heater.... The previous Thermal Expansion Tank was 15 years old and the same age as my 40 gallon water heater. The water heater started to make some strange sounds recently with hissing being the most predominant. Replacing the Thermal Expansion Tank stopped the hissing noise. The bladder on the new tank was preset to 40 psi (measured with a tire pressure gauge) and the old tank had a pressure of 15 psi. I think the bladder in the old tank hardened and lost its flexibility but I am not sure of this observation. As of now (1 month later), the hot water heater has lost its indigestion and appears happy.
Date published: 2015-07-26
Rated 5 out of 5 by from required on a "closed system" After installing a new electric HWT and a pressure reducing valve I required a thermal expansion tank so the heated water volume could go somewhere. I inflated the tank from 20 psi to 76 psi (the same psi as I set the pressure reducing valve) before installing on the cold water line over the HWT using a copper T with a 6" extension of 3/4" copper pipe sweated to a 3/4" female threaded copper adapter. Wrapped the male 3/4" nozzle on the tank with Teflon tape and screwed the tank onto the female adapter and the maximum pressure on the hose bib is 80 psi. No more leaking of the relief valve or my Delta kitchen faucet from the past 160 psi with the HWT on. I have braced the cold water line at the copper T to support the weight of the TE tank which can be mounted vertically up or down and horizontal with adequate support.
Date published: 2014-04-15
Rated 3 out of 5 by from **watch for corrosion/leaks! for some strange reason, rust set in right on top, near the neck - I thought at first, water must be seeping from the threads but nope, corrosion somehow ate thru the metal - seepage followed.
Date published: 2012-08-14
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