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OneFlow Residential Anti-Scale Systems for Tankless Water Heaters

Sales Channel: Multi-Channel

Series OFTWH-RES OneFlow Residential Anti-Scale System for Tankless Water Heaters provides protection from scale formation on internal and external plumbing surfaces. It is a single cartridge-based system that must be installed on a cold water line prior to a single water heating device (tankless water heater). Connection Sizes: 3/4 in. (20mm) FNPT. Flow Rates: up to 6 gpm (22.71 lpm).


  • Maximum flow rate: 6 gpm
  • Chemical-free, salt-free scale prevention and protection system that improves efficiency of all water heating devices and downstream plumbing components
  • Environmentally-friendly technology requires no electricity and generates no wastewater
  • Simple shutoff and filter change with inlet ball valve and filter wrench – filter cartridge only needs to be changed every two years

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Select options below to identify the UPC, Order Code, and Repair Kit for a specific OFTWH-RES

Approval Information

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please visit our certification partner websites: