Product Series Description
The DXT Series non-code diaphragm thermal expansion tank is designed for use in domestic system installations for sanitary hot water applications. The tank is installed in systems equipped with a backflow preventer or as an add-on to direct or indirect water heaters. The tank’s function is to absorb the increased volume of water which results from the heating process, thereby keeping the system’s pressure below the relief valve settings. The tanks are now available in sizes from 2 to 132 gallons. The heavy duty butyl diaphragm is designed to provide a permanent separation of the water from the air cushion. The exclusive plastic liner (2 gallon – 21 gallon) and stainless steel connection ensures effective protection against corrosion and allows the product to be safely used in domestic hot water systems. The installation of a DXT tank in any of the above mentioned systems reduces the system’s operating costs and prevents unnecessary relief valve operation. Unit is NSF61 and IAPMO certified.
Features & Benefits
Welded Construction | Adds safety to your installation. |
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Heavy Duty Butyl Diaphragm | Withstands temperatures as high as 200°F. Of solid construction, manufactured in house through an injection molding process. Made of proprietary food quality Butyl compound which will not release taste or odors in the water. |
epoxy coated tan finish | Provides an attractive, durable appliance like finish |
35 PSI Factory Precharge on All Models | Suits most common installations. The precharge can be manually adjusted on site. |
Strong Construction | Tanks are sturdy and built to last, while at the same time they are lightweight, easy to handle, and simple to install. |
Stainless steel water inlet | Stainless steel connection prevents corrosion |
Food Grade Polypropylene Lining / Epoxy lining | The Food Grade Polypropylene liner provides good protection against water corrosion, yet it does not affect the taste or quality of the water. Moreover, the lining does not allow the diaphragm to stick to the tank shell. |
* When installed in normal environmental conditions. By normal environmental conditions it is meant environments which are free of acids, scale or chemical deposits or other factors known to affect paints, coatings and metals.

Packaging & Shipping Data
Model Number | Packaging Dimensions (in.) | Volume (cu.ft.) | Quantity * per Pallet |
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DXT-8 | 8-5/16 x 8-5/16 x 12-5/8 | 0.48 | 162 |
DXT-18 | 10-7/8 x 10-7/8 x 16-7/8 | 1.15 | 70 |
DXT-24 | 10-7/8 x 10-7/8 x 18-7/8 | 1.40 | 70 |
DXT-35 | 16-1/4 x 16-1/4 x 16-1/4 | 1.40 | 33 |
DXT-50 | 15-7/8 x 15-7/8 x 23-3/8 | 3.71 | 33 |
*Quantity per pallet may vary depending on the size of the pallets and the limitations presented by the means of transportation used when shipping out the product to its final destination. In case there are differences between the quantities per pallet listed here and the actual quantity per pallet loaded, you will be contacted by one of our staff members.
Selection Tables
Ending Temperature
System Content (gal.) | Max. Desired Press. (PSIG) | 110°F | 120°F | 130°F | 140°F | 150°F | 160°F | 170°F |
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30 | 90 100 120 | DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 |
40 | 90 100 120 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 |
50 | 90 100 120 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-18 DXT-8 DXT-8 | DXT-18 DXT-18 DXT-8 |
75 | 90 100 120 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-8 DXT-8 DXT-8 | DXT-18 DXT-18 DXT-8 | DXT-18 DXT-18 DXT-18 | DXT-18 DXT-18 DXT-18 | DXT-18 DXT-18 DXT-18 |
100 | 90 100 120 | DXT-8 DXT-8 DXT-8 | DXT-18 DXT-18 DXT-8 | DXT-18 DXT-18 DXT-18 | DXT-18 DXT-18 DXT-18 | DXT-18 DXT-18 DXT-18 | DXT-18 DXT-18 DXT-18 | DXT-24 DXT-18 DXT-18 |
120 | 90 100 120 | DXT-18 DXT-8 DXT-8 | DXT-18 DXT-18 DXT-18 | DXT-18 DXT-18 DXT-18 | DXT-18 DXT-18 DXT-18 | DXT-18 DXT-18 DXT-18 | DXT-24 DXT-24 DXT-18 | DXT-24 DXT-24 DXT-24 |
250 | 90 100 120 | DXT-18 DXT-18 DXT-18 | DXT-24 DXT-24 DXT-18 | DXT-35 DXT-35 DXT-24 | DXT-35 DXT-35 DXT-35 | DXT-50 DXT-35 DXT-35 | DXT-50 DXT-50 DXT-35 | DXT-50 DXT-50 DXT-50 |
For supplying minimum pressure 45-50 psig – Thermal Expansion Absorber must be precharged to 40 psig – For relief valve setting: 125 psig – use 100 psig minimum pressure, 150 psig – use 120 psig minimum pressure; Initial temperature 60° F
Downloads
- DWT Series – Diaphragm Hydro Pneumatic Tanks (non-ASME) Submittal Data Sheets
- DXT Installation Instructions Product Manuals