Contact Us Toll Free: (800) 562-2447
Local number: (805) 988-6800

About Harwil

Who We Are and What We Do

Harwil has manufactured low-cost, highly-reliable flow and level switches for over 50 years. Our mission is to help companies succeed by providing them with extremely cost effective and reliable products with the quickest shipments in the industry.

Our products are very versatile, giving us the ability to cover many different industries. We currently supply the Pool and Spa, Water Heating/Cooling, Irrigation, Pump and Tank Manufacturing, Water Treatment, Carpet Cleaning, Geothermal, Heavy Equipment, and Pressure Washer Industries, with many more on the way.

The materials utilized in the manufacturing of our products allow us to be used in virtually any fluid, with temperature ranges up to and including 250°F (121°C); as well as pressures reaching 300psig. Simply tell us the type of environment your system contains, and we will work with you in deciding what materials are most suitable.

Operational Information

We DO NOT use multiple choice menu driven voice mail in response to your important telephone call.

WE ANSWER THE TELEPHONE with actual human beings experienced in taking your order for standard products or providing technical application assistance.

Our order desk is open 8:00 to 4:30 (PST), Monday through Friday.

Our FAX is (805) 988-6804

Our E-Mail address is

Technical Application Assistance

In depth technical information to help you select the optimum HARWIL product for your particular application is as close as your computer or telephone.

  • Tel: (805) 988-6800, FAX (805) 988-6804, E-Mail:
  • We can modify standard units for special applications.
  • We also design and manufacture completely new models for O.E.M applications.

Emergency Deliveries

Our half-century history of supplying support items such as level controllers, fluid flow and liquid level switches to a broad spectrum of industries has “burned” into our collective brains the importance of fast delivery of emergency orders to keep our customers “on line”. To this end we:

  • Attempt to keep reasonable numbers of all standard models in stock, i.e. physically on our “emergency shelf” for instantaneous delivery of small orders.
  • We have shipped orders received by 9:00 am local time that same day.