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Internet # 202798865

Model # RTG20210

Store SKU # 142788

Store SO SKU #1000898877

3 in. x 5 in. Horizontal Stainless Steel Concentric Termination Vent Kit for Mid Efficiency Tankless Gas Water Heaters

$180.81
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  • Compatible with Mid Efficiency Tankless Water Heaters
  • Easy to Install Horizontal Venting
  • 12 inch Wall Plate Included
  • View More Details

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Product Details

About This Product

This Stainless Steel 3 in. x 5 in. Concentric Direct Vent Termination Kit is designed for use with Rheem EcoSense Mid Efficiency Tankless gas indoor direct vent Units. Made of durable stainless steel, the kit includes the components required to construct a typical through-the-wall venting with horizontal termination.

Highlights

  • Stainless steel components
  • 12 in. wall plate included with screws
  • 94 degree elbow included
  • Can be extended for up to 10 in. walls
  • 1-year limited warranty
  • Durable construction
  • Long performance life
  • Rheem is known for its acclaimed water and air systems
  • Fix your water heater with peace of mind using genuine Rheem parts
  • 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
     see Prop 65 WARNINGS

Product Information

Internet # 202798865

Model # RTG20210

Store SKU # 142788

Store SO SKU #1000898877

Specifications

Dimensions: H 16.75 in, W 5 in, D 12.75 in

Dimensions

Product Depth (in.)

12.75 in

Product Height (in.)

16.75 in

Product Width (in.)

5 in

Details

Finish Family

Silver Metallic

Material

Stainless Steel

Pack Size

1

Returnable

90-Day

Warranty / Certifications

Manufacturer Warranty

1 Year Limited Warranty

Questions & Answers

ECOH180DVELP-3 Is this right kit for this heater
ByDec 2, 2025
1 Answer | 
Answer This Question

Hi Steve, The horizontal concentric vent kit is the right one for the ECOH180DVELP‑3 if you’re venting through a wall. Derius

By|Dec 10, 2025


    What size hole saw is needed to cut the hole in the wall
    ByNov 28, 2025
    1 Answer | 
    Answer This Question

    Hi John, Based on the information you provided, it may be best to use a 5"-hole saw (or slightly larger) to cut the wall opening for the concentric vent kit. Derius

    By|Dec 9, 2025


      Will this fit a ECO200DVELN-3?
      BySep 14, 2025
      2 Answers | 
      Answer This Question

      Will this work with ec0200dveln-3

      By|Dec 1, 2025

        Hi Mike, Yes, the 3" x 5" Horizontal Concentric Vent Kit is compatible with the ECO200DVELN-3 tankless water heater. It’s designed for mid-efficiency indoor direct vent models like yours. Derius

        By|Sep 17, 2025


          Would this fit model ECO160DVLN-3 and need any other adapters?
          ByAug 23, 2025
          1 Answer | 
          Answer This Question

          Great question, Enrique! Yes, the RTG20210 3 in. x 5 in. Horizontal Stainless Steel Concentric Termination Vent Kit is compatible with the ECO160DVLN-3 model. This vent kit is specifically designed for mid-efficiency indoor direct vent tankless gas water heaters like yours. Compatibility Highlights Fits EcoSense and RTG series mid-efficiency models Designed for horizontal through-the-wall venting Includes: 94° elbow 12" wall plate Termination cap Screws and hardware Do You Need Additional Adapters? In most standard installations: No extra adapters are needed if you're venting directly through a wall up to 10" thick. If your wall is thicker or you need to extend the vent run, you may need: Extension pipe sections Wall thimble or firestop spacer (depending on local code). Derius

          By|Aug 25, 2025


            Requirements for horizontal ventilation with eves
            ByDec 7, 2024
            1 Answer | 
            Answer This Question

            Hello Rich, For assistance with your inquiry, please call Technical Support at 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST and one of our experienced analysts will be happy to assist you. Isaiah

            By|Dec 10, 2024


              what is the dimension from the back of the 90 degree piping to the end of the supplied horizontal pipe?
              ByJun 4, 2024
              1 Answer | 
              Answer This Question

              Hi Richard and thank you for your question. The 90-Degree Elbow – 8.1" rise - 8.1" run . The other piece does not have a specific length and you may need to call. 866-720-2076.

              By|Jun 5, 2024


                Does this exhaust get hot, at the exit point outside?
                ByMay 8, 2024
                1 Answer | 
                Answer This Question

                Hi James and thank your for your question. Yes, but there is no temperature listing for this due to too many variables.

                By|May 9, 2024


                  Need coaxial vent for a Williams 6551522A room heater to go through wall and go vertical to above roof line termination. Is this kit compatible for such with additional piping and hangers.
                  ByMar 26, 2024
                  1 Answer | 
                  Answer This Question

                  Hi greenie and thank you for your question. Please call 1-888-444-1212.

                  By|Mar 27, 2024


                    Viewing 1-8 of 84

                    Customer Reviews

                    3.9 out of 5

                    • 3.9 out of 171 reviews
                    • 69% recommend this product
                    Filter by:
                    Showing 1-10 of 171 reviews
                    Didn't fit my unit
                    Didn't fit my unit
                    by
                    • Verified Purchase
                    2 found this review helpful
                    This was installed on our 2nd Rheem we have installed in our home. The 1st one used a straight u...
                    This was installed on our 2nd Rheem we have installed in our home. The 1st one used a straight up and captured air from inside the garage. The new Rheem vented directly through the wall to the outside, with the air draw coming in the same tube. Very clean design and easy to install. It would have been nice to have a 'template' about where to drill through the wall (it requires a drop), but, with some simple math, I was able to accomplish it.
                    by
                    • Verified Purchase
                    • Recommended
                    1 found this review helpful
                    Easy to install with the Rheem tankless water heater we purchased
                    Easy to install with the Rheem tankless water heater we purchased
                    by
                    • Verified Purchase
                    • Recommended
                    This item arrived a whole week sooner than anticipated! Fit...
                    This item arrived a whole week sooner than anticipated! Fit perfectly and easy to install.
                    by
                    • Verified Purchase
                    The vent kit went in easy and we needed to...
                    The vent kit went in easy and we needed to buy an extension because of the thick walls in our 1880s home which was an easy addition.
                    by
                    • Verified Purchase
                    This customer chose to rate the product and not provide text.
                    by
                    • Verified Purchase
                    Parts worked just like they are supposed too.
                    by
                    • Verified Purchase
                    Overall, this vent was perfect for my situation. The tankless water heater was mounted on an outside wall, 5-1/8" thick, with Corbond insulation, studs 16" oc. The only issues I had was drilling for vent joint fasteners - that steel is hard! and also, trying to hit 4 deg drop for the center pilot hole!
                    by
                    This customer chose to rate the product and not provide text.
                    by
                    worked well just a little short for what i needed
                    by
                    • Verified Purchase
                    Showing 1-10 of 171 reviews