North Star NST25ED Water Softener Two-tank Model - 25,000 Grain Capacity - Electronic Demand

by North Star
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About the North Star NST25ED Water Softener Two-tank Model - 25,000 Grain Capacity - Electronic Demand

Own one of the most efficient water softeners in the industry!

Hard water can create many problems, from creating deposit build-up on pipes, fixtures, appliances, and your water heater. Installing a North Star NST25ED Water Softener will reduce deposits in your water system tremendously, preventing premature damage to your appliances, and also providing clean drinking water, more comfortable shower water, and spot-free dishwashing. North Star NST25ED conditioning systems improve your quality of life, comfort, and health, while reducing your maintenance and repair expenses.

North Star is the world’s leading manufacturer of water softeners, having over 85 years experience in the industry. North Star manufacturer residential and commercial systems, putting the same technology as a large commercial unit, in the compact size designed for your home.

The North Star NST25ED has a 26,600 Grain Capacity and will service a household of 2-3 people with a water hardness level of 3-11 grains. For households with more people, a larger unit may be needed. The compact size of the North Star NST25ED takes up less than 1.5 sq ft of floor space, yet is powerful enough to manage your entire household water usage.

Advanced Features Include:

“Look Ahead Technology”: The intelligent patented monitoring system that actually learns your water usage patterns and becomes more efficient as it learns.  The North Star NST25ED’s “Look Ahead” also calculates an accurate proportion of salt and water is needed to regenerate only the used sections of the resin beads, saving you salt and water.

Super Cap Time Keeper: In the event of power failure, The North Star NST25ED will remain on for 72 hours, and will retain all memory data. After the 72 hour reserve period, the unit will turn off, keeping all data stored until power is restored.

No-worry Setting: There is no need to power off your North Star softener unit when on vacation, the unit will recognize that you are not using water, and will not over-generate.

Counter-Current Regeneration: Pioneered by North Star, the brine water method of regeneration draws brine water into the resin tanks, enhancing the process, and greatly increasing efficiency.

High Capacity Resin is the most efficient and long lasting resin of its kind, with the resin bed agitator, preventing collection of iron, dirt, and solids; keeping the North Star NST25ED operating at peak efficiency.

Runs on 24V Electricity to reduce electrical safety hazards.

Additional Information:

Spec Data Sheet


  • Removes Minerals such as Calcium and Magnesium 
  • Protects your plumbing, faucets, appliances, and water heater from mineral deposits and build-up
  • Leaves dishes cleaner and spot free
  • Increases water heater efficiency by up to 29%
  • Energy Efficient system pays for itself through energy, water, salt, and soap / detergent savings


  • Max Capacity: 26,600 Grains
  • Resin: 0.7 Cubic feet
  • Connection Size: 1" 
  • Standard Valve
  • Rates Service Flow Rate: 6 GPM
  • Intermittent Flow Rate: 8.4 GPM
  • Rated Clearwater Iron Removal: 7 PPM
  • Electronics: Electronic Demand 
  • Efficiency: 5000 Grains per lb. of Salt
  • Dimensions: 48-3/4" H  x 11-1/ 2" W x 39" D
  • Connection height: 41-1/4" from the bottom of the unit


1-year Manufacturer Warranty on Parts - Contact Manufacturer for warranty details

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