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Watts OFTWH
Watts OFTWH
OneFlow® Anti-Scale System



Product has been discontinued.
Please call us for a suitable alternate product.

800-865-5931
Mon - Fri 8:30am - 5:00pm Central

Tankless water heaters with their tightly packed, small gage tubing can be prone to issues resulting from scale formation. Today there's a solution to this problem – OneFlow® Model OFTWH. The same water treatment technology that’s been used successfully in commercial plumbing is now designed to ensure scale-free tankless heater operation in your home or small business.

The OneFlow® Anti-Scale System provides protection from scale formation on internal and external plumbing surfaces. The OneFlow® system is a single cartridge-based system that must be installed on a cold water line prior to a waterheating device (water heater or tankless water heater) for single tankless heaters.

OneFlow® prevents scale by transforming dissolved hardness minerals into harmless, inactive microscopic crystal particles. These crystals stay suspended in the water and are passed to drain. The system requires very little maintenance, no backwashing, no salt and no electricity. Typical hardness problems, especially build-up of scale in heating elements, pipes, water heaters, boilers and on fixtures are no longer a concern.

OneFlow® is not a water softener. It does not add chemicals. It is a scale prevention device with proven third party laboratory test data and years of successful commercial, residential and food service applications. OneFlow® is the intelligent scale solution and is a great alternative to water softening (ion exchange) or scale sequestering devices.

Standard Features

  • Chemical-free scale prevention and protection - converts hardness minerals to harmless, inactive microscopic crystals making OneFlow® an effective alternative technology to a water softener for the prevention of scale due to water hardness
  • Virtually maintenance free - No salt bags or other chemicals to constantly add or maintain
  • No control valve, no electricity and no wastewater
  • Uses environmentally friendly “green” technology
  • Improves efficiency of all water heating devices and downsream plumbing components
  • Simple sizing & installation – standard 3/4" connections
  • Perfect system for restaurants, cafeterias, coffee shops and homes where multiple or single equipment protection is desired for longer equipment life and reduced energy consumption
  • Inlet ball valve for easy isolation shutoff and filter changes
  • OneFlow® cartridge-based systems are easily maintained; change the cartridge once every two years
  • Easily installed mounting bracket included w/filter wrench to allow cartridge change-outs when necessary

Instructions & Brochures

Watts OFTWH Spec Sheet (pdf, 423 KB)
Watts OFTWH Brochure (pdf, 608 KB)
Watts OFTWH Installation Instructions (pdf, 961 KB)
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