How to Install Two Water Pressure Tanks Together

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Unlike pressure tanks, municipal water tanks provide water pressure through gravity.
Unlike pressure tanks, municipal water tanks provide water pressure through gravity. (Image: Thinkstock/Comstock/Getty Images)

When you're operating on a water well, one challenge you have to contend with is a finite well supply. Well supply is a factor of both the storage volume of the well and the well's recovery rate. A water pressure tank gives you additional water storage. It also helps protect your well from damage that can occur when the well is run dry, and can keep the pump from being damaged if you run it too often. A second water pressure tank can further enhance these benefits.

Things You'll Need

  • Permit
  • 2 water pressure tanks
  • Submersible pump
  • Pressure switch
  • Pump motor control box
  • Isolation valves
  • Check valve
  • PVC pipe
  • Fittings
  • Elbows
  • PVC glue

Obtain all necessary permits before beginning work. This may mean submitting plans for the installation, completing an application and paying a fee. Pay particular attention to any inspections required during the installation. If the house already has water service, turn off the water to the house before beginning installation, as well as the electricity to the well pump system.

Install the check valves and the isolation valve. Connect one check valve to the pipe coming into the house from the well. The check valve prevents water from flowing back into the well because of pressure from the water tanks. A T-fitting is then installed to divert water to the house on one side and the water pressure tanks on the other side. On the line going to the water pressure tanks, install an isolation valve and then another check valve.

Install the pressure switch on the main water line running from the T down to the pumps. This should be installed on the main water line before the connection to the first pressure tank. In this way, if the first pressure tank needs to be isolated, the pressure switch will still be able to control the second pressure tank.

Connect the two water pressure tanks to the main supply line. Once your water pressure tanks are in their proper position, use T-fittings to connect each tank individually to the main line. Install an isolation valve on each connection. For the outflow of the tank nearest the well line entry, use another T-fitting to both return to the main supply line and to connect to the second pressure tank. Install an isolation valve on each of these connections. With these isolation valves, you'll be able to turn off the water supply to either or both tanks should you need to make a repair.

Wire the pressure switch and the pump motor control box. Per the manufacturer's directions, wire the pressure switch to the control box and the power source. Run the power wire from the pump motor control box outside to the well pump.

Tips & Warnings

  • If you are working with a building that already has water service, have several old towels on hand. Even though you've turned off the water service, some water may remain in the pipes when you cut into the existing system.
  • Check with your local building code regarding its specific requirements before beginning your project. Some localities may require licensed plumbers and/or electricians to perform some or all of this installation.

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