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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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
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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Answers (3)

Asked by
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
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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
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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3 answers

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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Answers (3)

Asked by
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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
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
Glen Burnie, MD
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September 16, 2014
Answer: 
Comes pressurized to save you the trouble
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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
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July 20, 2014
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Answers (3)

Asked by
Arkansas
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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
South East Michigan
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October 8, 2015
Answer: 
Yes
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Asked by
Atlanta, GA, USA
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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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3 answers

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
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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
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
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
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

Rated 4.3 out of 5 by 56 reviewers.
Rated 3.0 out of 5.0 by OK, but I had difficulty with intall leaks Purchased unit after finding out it may extend the life of my hot water heater. Having plenty of room around my hwh, the intall was straight forward. I did have difficulty with the threaded fitting leaking. Used a pipe compound first, but that did not work. Drained my hwh, cleaned the pipe compound off and went with teflon tape. The leak changed to an occasional droplet that evaported before hitting the ground. I always worry about over tightening brass fittings. They should have a torque spec. Watch a youtube video on intall. Be sure to check your home's water pressure before starting project so you can properly inflate the tank to the correct pressure. I ended up intalling my tank horizontally, and supported the weight with a strap. August 11, 2015
Rated 5.0 out of 5.0 by 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. February 13, 2013
Rated 5.0 out of 5.0 by Easy install, worked as described This purchase was made in conjunction with a new water heater. Code required this unit. It was easy to install. You will need to purchase a $10 water pressure gauge with this product to insure you are pressurizing the unit to the correct PSI once installed. pressurized from the factory at 40 PSI, generally you will need to add air to the unit to equal the water pressure which usually runs about 60 PSI for the unit to perform as designed. Only add pressure when there is no water pressure on the tank. June 7, 2016
Rated 5.0 out of 5.0 by Tidy Tank for Tough Location This compact expansion tank was sized just right, to match our water pressure and heater tank size, while fitting into a low-overhead space. The packaging specifications helped to "remind" the plumber that a larger tank was not necessary. May 25, 2015
Rated 5.0 out of 5.0 by Good DIY repair for closed water system After city water company made "updates" to our meter we started experiencing water coming from water heater T&P valve. Connecting water gauge to hose bib confirmed that after water heater turned off the water expanded from 60 lbs to over 100 lbs. Sized tank according to our incoming water pressure and water heater size on the Watts website and installation went without problems. The night before installation, I pumped up the bladder to match incoming water pressure. Next day the tank was holding so I started installation. After repair, reconnected water gauge and ran hot water to force water heater to cut on. During water heater operation and after turning off the gauge stayed on 60 lbs of pressure. No more dripping from the T&P valve. Wish city water company would have told us that they were installing back flow device. Be sure you measure incoming water pressure to be able to pressurize tank to the size. April 6, 2015
Rated 5.0 out of 5.0 by simple solution Excellent information from Home Depot employee who happens to be a master plumber. He walked me through steps and even gathered parts. Water heater was leaking from pop off valve due to water expanding due to heating. Expansion tank gives the water "room to grow" and then relaxes when a valve is open April 14, 2015
Rated 5.0 out of 5.0 by Get one of these or else replace your water heater every couple of years! Get this expansion tank, install it ASAP and quit having to replace hot water tanks every couple of years... I have replaced 6 hot water tanks in 15 years all of which started to discharge rusty water or leak... I did a Youtube search a bit ago and found the reason that my hot water tanks kept going out was because I have a backflow preventer that was installed when my new water service line was installed 15 years ago... Municipalities are now requiring a back flow preventer installed with new service lines, which is a great idea, but they don't tell you that when your hot water tank heats up, the pressure created by heating water has nowhere to expand thereby ruining your perfectly good hot water tank and putting added pressure on your plumbing throughout the entire house. This tank fixed the problem ASAP... Easy to install, just show the plumbing guy at Home Depot a pic of your plumbing and he will guide you as to which parts that you will need to get the job done. I had this in and installed in about two hours... April 7, 2015
Rated 4.0 out of 5.0 by Installed without problems. Followed instructions, installed without problems. Note, if tank is installed sideways. Weight must be supported. June 10, 2014
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