Rheem® PREFERRED COMPACT™ Water Softener

18,000 Grain Small- to Medium-Capacity System

The Rheem® PREFERRED Compact™ 18,000 grain water softener’s space-saving design is ideal for smaller spaces, condos, townhomes, etc. The built-in Rheem® Learning Technology learns your water usage patterns to optimize salt* and conserve water and energy, saving you money. The Rheem® PREFERRED Compact™ 18,000 grain water softener is a reliable, high-performing softener with essential features that provide the highest-quality soft water to your home. And it’s designed, engineered and manufactured right here in the USA.

* For peak performance in your high-efficiency Rheem water softener, evaporated salt pellets or solar salt crystals with less than 1% impurities are recommended. We do not recommend using any kind of block salt in the Rheem water softeners. Learn more.

Water Softener Savings

Rheem® Learning Technology

Learns your home’s water usage patterns to optimize salt consumption, provide on-demand soft water for your home, and maximize overall softening efficiency.


Compact Water Softener

Space-saving design fits into small spaces and is ideal for condos, townhomes, etc.

Ideal for Households of 1 to 4 People

18,000 grain capacity ensures soft water is available for small- to medium-size households.

Optimal Water Pressure

High flow valve maintains water pressure in up to 1″ plumbing and homes with multiple bathrooms.

Easy Salt Loading

Sliding lid design allows for easy loading of salt

Lasting Quality

Durable, high-impact salt storage tank with an internal double-lined mineral tank will not deteriorate, rust or corrode. The tanks are guaranteed for 10 years.

Eliminates Unsightly Stains

Removes clear water (Ferrous) iron that causes reddish-brown stains to form on toilets, showers and sinks.

Made in the USA

Rheem® Water Softeners are designed, engineered and manufactured right here in the USA.

Backed with Industry-Leading Warranties

1-year on parts and labor (extendable to 5-years***), 3-years on electronics, 10-years on tanks.


*Based on findings from the Water Quality Association soft water benefits study.
**Based on the manufacturer’s internal laboratory testing.
***The 1-year can be extended to five years with the use of Rheem Cleaner – see warranty page for more information

Tech Specs

Model CodeLE18
Rated Softening Capacity (Grains @ Salt Dose)18,500 @ 10.8 lbs.
Rated Efficiency (Grains/Pound of Salt @ Minimum Salt Dose)4,100 @ 1.8 lbs.
Rated Service Flow Rate7.0 gallons per minute (gpm)
Amount of High Capacity Ion Exchange Resin0.64 cu. ft.
Pressure Drop at Rated Service Flow 9.5 pounds per square inch (psi)
Intermittent Flow Rate @ 30 psi9.0 gallons per minute (gpm)
Water Supply Max. Hardness65 grains per gallon (gpg)
Water Supply Max. Clear Water Iron3 parts per million (ppm)
Water Pressure Limits (min. / max.)20 – 125 psi
Water and Ambient Temperature Limits (min. / max.)40 – 120 °F
Minimum Water Supply Flow Rate3 gpm
Maximum Drain Flow Rate2.0 gpm
Dimensions:Height: 30-1/4″
Width: 14-1/2″
Depth: 21-1/4″

Extend Your Warranty and the Life of Your Softener

A little maintenance goes a long way to ensure your water softener maintains optimal performance. Adding Rheem® Water Softener Cleaner every four months can make all the difference. Plus, with regular use, you can extend your 1-year parts and labor warranty up to 5 years.

More About Rheem Softener Cleaner
Preferred Series Water Softener Cleanser Bottle

<h2>Owner Resources</h2>
Find answers to all of your water softener installation and maintenance questions

Rheem® PREFERRED™ Installation Guide

Need help installing your water softener? Follow this guide.

View Guide

Rheem® PREFERRED™ Product Manual

Use the product manual to learn everything you need to install, operate and maintain your softener.

View Product Manual