Concentric vent kit · Rheem

Rheem RTG20274C Vent Termination

Concentric vent kit

Concentric vent kit

Updated October 2026

The short answer

A well-specified concentric vent kit for installing or servicing a tankless heater.

Delivers
Concentric vent kit.
Watch for
Confirm the part number first.
Suits
Installing or servicing a tankless heater.
Material
Stainless Steel
Dimensions (seller)
13.5"W x 18"H
Product weight
2.11 kg
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What it delivers

The Rheem RTG20274C Vent Termination is a concentric vent kit.

Use only the vent system and parts the heater's manual names; vent length and elbow count limits are set per model.

Order vent parts by the heater's model: the manual names the vent material and brand, the maximum length and number of elbows, and the clearances from windows and doors.

Listed details: features: Safety Seal Rings, Concentric Design; material: Stainless Steel; model: RTG20274C.

The listing gives dimensions of 13.5 in (W) x 18 in (H), a weight of 2.11 kg and hardware and instructions when applicable in the box.

Right unit for this house?

Install it when

  • Installing or servicing a tankless heater
  • Matching a part named in the manual

Look at another unit when

  • Heaters it doesn't name

Strengths and trade-offs

Strengths

  • Concentric vent kit

Trade-offs

  • Confirm the part number first

Install limits

  • Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.

Rated performance

Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.

Model numberRTG20274CRetailer
Dimensions (seller)13.5"W x 18"HRetailer
Features (seller)Safety Seal Rings, Concentric DesignRetailer
Product weight2.11 kgRetailer
MaterialStainless SteelRetailer

Rival units at this flow

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Full venting and install parts spec grid · Every Rheem unit in the catalog

Final verdict

A well-specified concentric vent kit for installing or servicing a tankless heater.

Buy this unit

Our links open this exact model's product page. Prices and stock change; check what's included before you order.

Prices change often; the button shows today's price.

Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure

Questions buyers ask

Will the Rheem RTG20274C Vent Termination fit my heater?
Only if its listing or maker names your heater model or series. Check the part number in your heater's installation manual.