11 Rheem Gas Water Heater Venting Kit Horizontal Termination For Basement Installation of 2026 With Airtight Wall Seals

1

Rheem RTG20274C Tankless Horizontal Vent Termination Kit

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  9.2
• Brand
  Rheem

Key specs1

Vent pipe construction

Concentric stainless steel routing pulls fresh combustion air through the outer sleeve while expelling flue exhaust through the inner pipe.

Pros & cons32

Pros

• Concentric stainless steel design carries fresh air intake and flue exhaust through one wall penetration
• Factory seal rings at connection points prevent flue gas leaks inside basement living areas
• Low-profile exterior termination profile minimizes protrusion on outer siding

Cons

• Specific wall thickness penetration rating is omitted from manufacturer specs
• Incompatible with two-pipe PVC or ABS venting configurations

2

Rheem RTG20292-1 Horizontal Vent Cone Kit, 2x8 Wall Tankless Heater

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  9.4
• Brand
  Rheem

Key specs2

Wall thickness capacity

Up to 10 inches

Included elbow fitting

The included 90-degree elbow helps route venting through tight rim joists and close-clearance basement framing.

Pros & cons32

Pros

• Rated for exterior basement walls up to 10 inches thick
• Includes a 90-degree elbow to navigate tight joist bays and framing corners
• Genuine OEM factory authorized replacement part for Rheem, Ruud, and Richmond heaters

Cons

• Requires sourcing additional vent pipe lengths to finish the installation run
• Weighs 6.85 pounds, requiring solid exterior mounting support

3

Rheem RTG20291-1 Tankless Horizontal Vent Cone Termination Kit

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  8.9
• Brand
  Rheem

Key specs1

Assembly components

• All OEM genuine factory authorized parts included
• Rugged metal housing components
• 1-year limited manufacturer warranty

Pros & cons32

Pros

• Rugged metal construction provides long-lasting structural durability
• Contains all genuine OEM factory authorized replacement components
• Backed by a 1-year limited manufacturer warranty

Cons

• Wall thickness capacity is not stated and requires verification before purchase
• Specific pipe collar diameter is omitted from the product listing

4

Rheem RTG20320 Tankless Adjustable Concentric Vent Kit

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  7.9
• Brand
  Rheem

Key specs2

Pipe extension range

10 to 13 inches adjustable

Vent pipe construction

Features cut-to-size concentric stainless steel piping with built-in seal rings that simultaneously manage intake air and flue exhaust.

Pros & cons42

Pros

• Adjustable concentric design telescopes between 10 inches and 13 inches
• Can be cut to size to match specific basement rim joist framing depth
• Factory seal rings at joints prevent exhaust gas leakage into living space
• Stainless steel concentric build handles both intake air and flue exhaust

Cons

• Heavier 8.65-pound weight requires sturdy wall brackets or pipe hangers
• Not designed for standard two-pipe PVC or ABS plastic vent runs

5

SP20285 Horizontal Vent Termination Kit for Tankless Gas Water Heater,With

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  8.6
• Brand
  Wosijm

Key specs2

Pipe material compatibility

• 2-inch PVC pipe
• 2-inch ABS pipe

Installation spacing

Features 4-inch center-to-center spacing and requires 1-inch exhaust protrusion and 2.25-inch intake protrusion for proper fitment.

Pros & cons42

Pros

• Low-profile faceplate conceals both intake and exhaust pipework cleanly
• Engineered specifically for standard 2-inch PVC and ABS vent pipes
• Supports horizontal through-the-wall and vertical roof installations
• Includes exterior wall mounting screws in the package

Cons

• Does not fit 3-inch pipe systems or concentric stainless configurations
• Requires exact pipe cuts: 1 inch on exhaust and 2.25 inches on intake side

6

Rheem RTG20274A Tankless 3 in. x 5 in. Horizontal Vent

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  7.4
• Brand
  Rheem

Key specs1

Wall thickness capacity

Up to 5 inches

Pros & cons32

Pros

• Standard 3-inch by 5-inch concentric profile fits direct-vent tankless units
• OEM authorized direct replacement for Rheem, Ruud, and Richmond water heaters
• Protected by a 1-year limited warranty

Cons

• Rated for walls up to 5 inches thick, requiring extensions for deeper framing
• Requires additional venting pipe sections to complete the connection

7

Rheem RTG20274D Tankless Horizontal Vent Cone Termination Kit

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  8.2
• Brand
  Rheem

Key specs1

Assembly components

• OEM factory authorized replacement parts
• Metal vent cone termination structure
• 1-year limited manufacturer warranty

Pros & cons32

Pros

• Rugged metal construction resists outdoor weather and high exhaust heat
• Complete kit contains all OEM genuine factory authorized parts
• Backed by a 1-year limited warranty

Cons

• Maximum wall penetration depth is omitted from the product listing
• Vent diameter is not specified and must be confirmed against your heater collar

8

Rheem ProTech RTG20273 Concentric Horizontal Termination Kit, 4-In.

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  7.2
• Brand
  Rheem

Key specs1

Wall penetration depth

Up to 8 inches

Pros & cons32

Pros

• Accommodates basement exterior wall thicknesses up to 8 inches
• Blows exhaust vertically away from the wall to prevent flue gas recirculation
• Supplied with eight 1/2-inch sheet metal screws for installation

Cons

• Exceeding 8-inch wall depth requires separate extensions or different fittings
• Engineered exclusively for 4-inch concentric venting systems

9

SP20286 3-Inch Vent Horizontal Vent Termination Kit, with Screws

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  8.0
• Brand
  XiHu

Key specs1

Pipe material compatibility

• 3-inch PVC piping
• 3-inch ABS piping

Pros & cons32

Pros

• Designed specifically for standard 3-inch PVC and ABS vent pipe systems
• Corrosion-resistant materials withstand prolonged outdoor exposure
• Includes mounting screws for straightforward exterior wall attachment

Cons

• Will not fit 2-inch piping lines or concentric stainless direct-vent systems
• Listed 1 x 1 x 1 inch dimensions are placeholder figures rather than plate size

10

Rheem RTG20280-1 Tankless Horizontal Vent Termination Kit

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  7.6
• Brand
  Rheem

Key specs2

Heating unit compatibility

Engineered specifically for Rheem EcoSense Mid Efficiency tankless gas indoor direct vent units that vent through an exterior wall.

Wall penetration depth

Up to 10 inches

Pros & cons42

Pros

• Extends to penetrate exterior walls up to 10 inches thick
• Included 94-degree elbow simplifies horizontal alignment through rim joists
• Stainless steel construction provides durability against corrosive flue gases
• Includes a 12-inch wall plate assembly with mounting screws

Cons

• Tailored specifically for Rheem EcoSense Mid Efficiency direct vent models
• Incompatible with PVC or ABS two-pipe vent systems

11

Rheem RXGY-G01 Water Heater & Furnace Horizontal Vent Termination Kit

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  7.6
• Brand
  Rheem

Key specs2

Heating unit compatibility

• Rheem RTGH-84DV tankless models
• Rheem RTGH-95DV tankless models
• Compatible Rheem furnace series (RGRA, UGRA, RGFD)

Outer faceplate dimensions

11-3/4 in W x 8 in H x 2-1/2 in D

Pros & cons42

Pros

• Compatible with 3-inch PVC and ABS two-pipe direct-vent setups
• Direct fit for Rheem RTGH-84DV and RTGH-95DV tankless water heaters
• Compatible with multiple Rheem gas furnace series including RGRA and RGFD
• Compact faceplate measures 11-3/4 inches wide by 8 inches tall

Cons

• Does not work with concentric stainless steel vent connections
• Exterior wall holes must precisely match the fixed 3-inch pipe spacing

Last update on 2026-10-22 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Does a Rheem gas water heater require concentric stainless steel or two-pipe PVC venting?

It depends on the specific appliance design and efficiency rating of your water heater. Certain units require stainless steel concentric vent pipes, such as the RTG20320 or the 3 in. by 5 in. RTG20274A, while high-efficiency systems vent through PVC and ABS piping using terminations like the RXGY-G01. Before selecting venting hardware for your whole-house tankless water heater, check the venting section of your heater manual to confirm whether it specifies concentric metal piping or two separate plastic pipes.

Will a Rheem horizontal termination kit pass through an 8-inch or 10-inch basement wall?

Yes, provided you choose a kit rated for that specific wall depth. The Rheem ProTech RTG20273 lists a maximum wall thickness of 8 inches, and the RTG20292-1 is built for 2x8 wall construction. If your basement framing requires flexibility across thicker dimensions, the RTG20320 provides an adjustable vent range from 13 inches to 10 inches. For wider penetration coverage, the RTG20280-1 includes a 12-inch wall plate assembly with mounting screws.

How do horizontal termination kits prevent flue gas recirculation?

Horizontal kits separate the fresh air intake and exhaust pathways through engineered physical spacing or directional discharge. The Rheem ProTech RTG20273 blows exhaust vertically away from the termination point to prevent exhaust from drafting back into the air supply. Low-profile designs like the SP20285 conceal the intake and exhaust pipework while maintaining isolated flow paths. Assemblies such as the RXGY-G01 establish fixed separation across a plate measuring 11-3/4 inches wide by 8 inches tall by 2-1/2 inches deep.

What piping materials fit the Rheem RXGY-G01 and SP20286 termination kits?

The RXGY-G01 termination kit fits PVC and ABS piping. The SP20286 kit is designed specifically for standard 3-inch vent terminal systems and includes durable screws for exterior mounting. If your water heater uses stainless steel concentric components instead of plastic pipes, select a metal assembly like the RTG20274C rather than a PVC plate.

Can you install Rheem horizontal vent termination kits on Ruud or Richmond water heaters?

Yes, select Rheem horizontal vent components serve as direct replacements across Rheem, Ruud, and Richmond models. Kits like the RTG20274A 3 in. by 5 in. kit and the RTG20292-1 vent cone kit list direct replacement compatibility across all three brands. You will need to use additional venting pipe with these kits to complete the connection between the heater and the outside wall.

How do you mount a low-profile vent kit to an exterior wall?

You secure the termination plate directly against the exterior surface using the included mounting hardware. Kits like the 2-inch SP20285 and the 3-inch SP20286 include durable screws to attach the plate to an outside wall without requiring specialized tools. For metal concentric installations, kits such as the RTG20280-1 supply a 12-inch wall plate with mounting screws to anchor the stainless steel components firmly against the structure.