#1 Home Improvement Retailer

Internet # 311581218

Model # RTG20251

Store SKU # 1004815913

Water Treatment System for Tankless Water Heater

Apply Now
Pay $140.00 after $25 OFF your total qualifying purchase upon opening a new card. info
Apply for a Home Depot Consumer Card
  • Fits all tankless water heater applications
  • Kit includes: Tank, filter, bracket, and screws
  • Covered by 1-year limited warranty
  • View More Details
0 in stock

Product Details

The Rheem PROTECH Water Treatment System is the perfect way to combat hard water and scale build up in your tankless water heater. The kit includes everything needed for installation. Ensure safe and reliable operation of your tankless water heater with this system.
  • Media cartridge distorts the calcium carbonate, preventing it from building up on itself
  • Softens and removes existing scale build up over time
  • Clear housing with fill label shows when the replacement cartridge is needed
  • Compact housing ( 13.5 in. tall ) allows for installation in smaller areas
  • Connection size: 3/4 in. female NPT
  • 1-year limited warranty
  • Durable construction
  • Rheem is known for its acclaimed water and air systems
  • Maximum pressure: 125 psi
  • California residents see prop 65 warnings
  • Call 1-855-400-2552 before noon for same-day installation service in most areas, or visit our Water Heater Installation page for more information.
  • Return Policy
  • California residents



Questions & Answers

Q:How can I get a copy of the Use and Care Manual for the Rheem RTG20251 Water Treatment System?
by|Jul 22, 2023
1 Answer
Answer This Question

A:  Hi RheemRequest and thank you for your question. Please call 866-720-2076.

by|Jul 24, 2023
    Q:Can this filter be added to an ecosmart 27 system that is already installed?
    by|Mar 28, 2023
    1 Answer
    Answer This Question

    A:  Yes it can be added.

    by|Mar 30, 2023
      Q:What is the difference between this and other filters? I can get a similar whole house filter that uses many different elements for about $20.
      by|Oct 16, 2022
      1 Answer
      Answer This Question

      A:  Hi KenR and thank you for your question. The size, material used, warranty, life expectancy, etc.

      by|Oct 17, 2022
        Q:How many gallons will the RTG20252 cartridge process before needing replacement? I'm not asking about time to replacement, but about VOLUME to replacement.
        by|Aug 27, 2022
        1 Answer
        Answer This Question

        A:  Hi Robert and thank you for your question, There are no charts to give that answer as everyone has different types/hardness of water.

        by|Aug 29, 2022
          Showing 1-4 of 11

          Customer Reviews

          5 out of 5
          • 5
            out of 3 reviews
          • 0% recommend this product
          Filter by:
          Showing 1-3 of 3 reviews
          Product is not performing as expected. Great addition to any...
          Product is not performing as expected. Great addition to any tankless water heater installation.
          • Verified Purchase
          1 found this review helpful
          Other than having an incredibly difficult time locating a replacement filter, very pleased with the product.
          • Verified Purchase
          • Verified Purchase
          Showing 1-3 of 3 reviews