Choosing the right vent terminal matters more than most buyers expect. The wrong fit can create clearance issues, installation headaches, or compatibility problems with your tankless system.
This roundup focuses on low profile tankless water heater vent terminals that are easier to place, easier to inspect, and better suited to tight exterior wall spaces.
Best 10 Low Profile Tankless Water Heater Vent Terminals Picks for 2026
Low-Profile All-in-One Pick
DiversiTech HVENT2 2-Inch Horizontal Vent Kit
- Conceals intake and exhaust pipework.
- Includes fittings for a simpler install.
- Works for horizontal or vertical venting.
Best For: clean exterior installs on compatible tankless and high-efficiency appliances
Weather-Resistant Universal Option
Rinnai 223181 Universal Horizontal Termination Kit
- Weather-resistant plastic construction.
- Compact 11-1/2-inch exterior profile.
- Made for compatible non-condensing Rinnai systems.
Best For: approved horizontal terminations on compatible Rinnai non-condensing heaters
Simple OEM Replacement
Rheem RSP21069G 2-Inch Vent Termination Kit
- Made for select Rheem tankless water heaters.
- Compact 8.4 x 4.7-inch size.
- Lightweight plastic construction.
Best For: exact-fit replacement on select Rheem tankless units
Condensing-Specific Termination
Rinnai 223174PP 8.7-Inch Horizontal Termination Kit
- Built for condensing-compatible tankless heaters.
- Compact 8.7-inch horizontal wall design.
- Stainless steel with limited lifetime warranty.
Best For: condensing tankless installations needing a wall-mounted termination
Rheem Horizontal Termination Kit
Horizontal Vent Termination Kit for 3" PVC
- Fits 3-inch PVC and ABS piping
- Compatible with specific Rheem models
- Compact one-piece white PVC kit
Best For: Compatible Rheem water heaters and gas furnaces needing a 3-inch horizontal vent termination
Rheem ProTech Low-Profile Cone Kit
Horizontal Vent-Cone Termination Kit
- Low-profile horizontal vent termination
- Includes elbow, cone, trim ring, and screws
- Fits walls up to 12 inches
Best For: Compatible Rheem tankless gas non-condensing heaters needing a low-profile wall termination
Premium Sealed Option
Rheem Concentric Horizontal Vent Termination Kit
- Stainless steel concentric vent termination
- Low-profile design for a cleaner exterior
- Safety seal rings help reduce leak risk
Best For: Natural gas tankless owners needing a sealed, low-profile concentric termination
Heavy-Duty Wall Kit
Rheem ProTech Horizontal Vent Termination
- Stainless steel horizontal vent system
- Includes wall plate, screws, and 94-degree elbow
- Adjusts for walls up to 10 inches thick
Best For: Compatible Rheem installations that need a durable wall termination with extra thickness range
Low-Profile All-in-One Pick – DiversiTech HVENT2 2-Inch Horizontal Vent Kit
If you want low profile tankless water heater vent terminals that keep the exterior looking clean, the DiversiTech HVENT2 is built for horizontal or vertical termination on high-efficiency fossil fuel appliances. It conceals both intake and exhaust pipework, which makes it a practical choice when appearance and proper venting both matter.
Best For: Homeowners or installers who want a tidy, all-in-one vent termination kit for tankless gas water heaters and similar high-efficiency appliances.
Pros:
- Low-profile design hides intake and exhaust pipework for a cleaner exterior finish.
- Includes all fittings needed for installation, reducing the need for extra outside connections.
- Designed for horizontal through-the-wall or vertical through-the-roof installations.
- Made for venting high-efficiency fossil fuel appliances, including tankless water heaters.
Cons:
- Product details do not specify compatibility with every tankless model.
- Best suited to systems that match its 2-inch venting setup.
Overall, this is a straightforward option if you want a clean-looking vent terminal with a complete kit layout. It focuses on function, ease of installation, and a neater exterior appearance.
Weather-Resistant Universal Option – Rinnai 223181 Universal Horizontal Termination Kit
Rinnai 223181 11-1/2” Universal Non-Condensing Plastic Horizontal Termination Ki, N/A
Check Price On AmazonFor buyers comparing low profile tankless water heater vent terminals, the Rinnai 223181 is a universal horizontal termination kit designed for compatible non-condensing systems. Its compact exterior profile and weather-resistant plastic construction make it a practical choice when you want a neat wall exit that helps direct exhaust away from the building.
Best For: Owners of compatible Rinnai non-condensing tankless water heaters who want a durable, wall-mounted horizontal termination.
Pros:
- Designed as a universal horizontal termination for compatible Rinnai non-condensing systems.
- Weather-resistant plastic helps it handle outdoor exposure.
- Compact 11-1/2-inch design supports a neat exterior finish.
- Helps protect the vent opening from rain, debris, and pests.
Cons:
- Only intended for approved venting systems and compatible models.
- Non-condensing use limits its fit for condensing units.
This is a focused replacement or install part when you need a clean, wall-mounted termination point. It stands out for durability and a simple exterior profile rather than broad universal compatibility.
Simple OEM Replacement – Rheem RSP21069G 2-Inch Vent Termination Kit
If you’re shopping low profile tankless water heater vent terminals for a select Rheem unit, the Rheem RSP21069G is a straightforward 2-inch vent termination kit. With a compact plastic build and dimensions of 8.4 inches by 4.7 inches, it is aimed at providing the product-specific termination piece you need without unnecessary extras.
Best For: Select Rheem tankless water heater owners looking for a compact 2-inch termination kit.
Pros:
- Built for use with select Rheem tankless water heaters.
- Compact 8.4-inch by 4.7-inch footprint.
- Plastic construction keeps the kit lightweight.
- Simple product-only package for direct replacement needs.
Cons:
- Compatibility is limited to select Rheem models.
- Product-only package may require using existing install parts.
This is a practical option when you need the correct termination kit for a compatible Rheem system. It is not a universal solution, but that specificity can be an advantage for exact-fit replacements.
Condensing-Specific Termination – Rinnai 223174PP 8.7-Inch Horizontal Termination Kit
Among low profile tankless water heater vent terminals, the Rinnai 223174PP is aimed specifically at condensing tankless water heaters and indoor installation use. It uses a horizontal wall mount format with a stainless steel material list and a compact 8.7-inch length, making it a purpose-built termination choice for systems that need condensing compatibility.
Best For: Condensing tankless water heater installations that need a horizontal wall termination kit.
Pros:
- Designed for condensing-compatible tankless water heaters.
- Horizontal wall mount format keeps the termination compact.
- Stainless steel construction adds a durable materials profile.
- Includes a limited lifetime warranty description.
Cons:
- Not intended for non-condensing systems.
- Indoor installation style may not fit every setup.
This kit is best viewed as a specialized termination part for the right type of unit rather than a universal vent accessory. If your system is condensing-compatible, its focused design makes selection much simpler.
Rheem Horizontal Termination Kit – Horizontal Vent Termination Kit for 3" PVC
Rheem RXGY-G01 Water Heater & Furnace Horizontal Vent Termination Kit for 3" PVC (SP20286)
Check Price On AmazonIf you’re comparing low profile tankless water heater vent terminals for a Rheem setup, this horizontal vent termination kit is built around 3-inch PVC and ABS piping. It’s a practical match for specific Rheem water heater and gas furnace models, with a compact white PVC body sized to terminate the vent cleanly at the exterior wall.
Best For: Homeowners with compatible Rheem RTGH-84DV or RTGH-95DV water heaters, or listed Rheem gas furnace models, who need a PVC/ABS horizontal vent termination.
Pros:
- Fits 3-inch PVC and ABS piping
- Designed for specific Rheem water heater and furnace models
- Compact 11-3/4″ wide by 8″ tall profile
- Simple one-piece kit in white PVC
Cons:
- Only works with listed compatible Rheem models
- Not a universal vent terminal
For buyers who already know their system compatibility, this is a straightforward horizontal termination option with the right pipe fit and a modest wall-mounted footprint. The main decision point is matching the exact appliance model and pipe type before ordering.
Rheem ProTech Low-Profile Cone Kit – Horizontal Vent-Cone Termination Kit
Among low profile tankless water heater vent terminals, this Rheem ProTech kit stands out for its low-profile horizontal vent termination design and included hardware. It’s intended for tankless gas non-condensing water heaters, and the stainless steel construction is paired with a 90-degree elbow, trim ring, and screws for installation through walls up to 12 inches.
Best For: Owners of compatible Rheem tankless gas non-condensing water heaters who want a low-profile horizontal vent termination for up to 12-inch walls.
Pros:
- Low-profile horizontal vent termination design
- Includes elbow, cone termination, trim ring, and screws
- Built for up to 12-inch walls
- Stainless steel venting for mid-efficiency units
Cons:
- Not compatible with current Rheem venting supplied by Metal Fab
- Limited to specific Rheem tankless gas non-condensing applications
This is a focused fit for buyers who need a low-profile termination and want the included parts to simplify the job. The key caveat is compatibility, so it’s best chosen only when the unit and venting setup match the manufacturer guidance.
SP20285 Compact Wall Kit – Horizontal Vent Termination Kit for 2" Pipes
This SP20285 option is designed for buyers looking for low profile tankless water heater vent terminals on 2-inch PVC and ABS piping. It’s a wall-mounted horizontal vent termination kit for high-efficiency appliances, with a flush exterior look that helps conceal intake and exhaust pipework while keeping installation parts in one included package.
Best For: Installers or homeowners using 2-inch PVC or ABS pipe on a high-efficiency tankless water heater or compatible furnace vent.
Pros:
- Fits 2-inch PVC and ABS piping
- Flush-mount design for a cleaner exterior appearance
- Includes the horizontal vent termination and screws
- Instructions included for easier installation
Cons:
- Only fits 2-inch piping
- Requires confirming 4-inch center-to-center spacing
- Appliance compatibility should be checked before purchase
As a compact termination kit, this is a sensible choice when you need a neat wall finish and already know the vent sizing is correct. Its value comes from the included hardware and straightforward fit, but confirming dimensions first is essential.
Premium Sealed Option – Rheem Concentric Horizontal Vent Termination Kit
Rheem RTG20274C Concentric Horizontal Vent Termination Kit for Tankless Water Heaters
Check Price On AmazonIf you want a low profile tankless water heater vent terminal with a cleaner exterior finish, this Rheem concentric kit is built for through-the-wall termination on natural gas tankless systems. Its stainless steel construction and concentric design are meant to pull in fresh air and expel flue exhaust through a single, compact termination point.
Best For: Homeowners who want a stainless steel, low-profile concentric termination kit for compatible natural gas tankless water heaters.
Pros:
- Low-profile concentric termination design
- Stainless steel construction for durability
- Pulls in fresh air and expels flue exhaust
- Safety seal rings help prevent gas leaks at connection points
Cons:
- Designed for natural gas systems
- Requires compatibility with concentric venting setup
- Not a universal fit for all tankless heaters
This is a strong pick if you want a neat, sealed termination solution rather than exposed vent piping. The included hardware and instructions make it more straightforward to plan for a proper installation, but matching the system requirements is still essential.
Budget-Friendly Concealed Vent – SP20285 Horizontal Vent Termination Kit
This low profile tankless water heater vent terminal is designed to conceal both the intake and exhaust pipework, which can make the outside wall look cleaner than exposed piping. The SP20285 kit is aimed at safe venting for high-efficiency fossil fuel appliances and is sized for 2-inch PVC and ABS pipes.
Best For: Buyers who want a low-profile, exterior-wall vent termination for 2-inch PVC or ABS setups.
Pros:
- Low-profile design conceals intake and exhaust pipes
- Suitable for high-efficiency fossil fuel appliances
- Includes screws for the kit
- Can be used for horizontal or vertical installations
Cons:
- Only suitable for 2-inch PVC and ABS pipes
- Requires careful dimension checks before buying
- Best fit depends on your existing cut dimensions
For shoppers focused on appearance and basic compatibility, this kit is a practical option. Just verify pipe size and spacing first, since the product notes stress that correct dimensions are key to a hassle-free install.
Heavy-Duty Wall Kit – Rheem ProTech Horizontal Vent Termination
For a low profile tankless water heater vent terminal built around stainless steel durability, this Rheem ProTech kit is made for through-the-wall venting on compatible non-condensing tankless gas water heaters. It includes a complete wall plate assembly, a 94-degree elbow, and adjustable wall thickness support up to 10 inches.
Best For: Installations that need a stainless steel horizontal termination kit with adjustable wall thickness support.
Pros:
- Stainless steel construction for corrosion resistance
- Includes 12-inch wall plate and mounting screws
- 94-degree elbow helps with vent configuration
- Extends to accommodate walls up to 10 inches thick
Cons:
- Designed for specific Rheem EcoSense mid-efficiency units
- Intended for non-condensing tankless gas water heaters
- Requires through-the-wall installation planning
This is the most installation-ready option in the group if you need a more complete wall-termination package. Its adjustable wall-thickness range makes it especially useful where wall depth could otherwise complicate the fit.
How We Picked the Best Low Profile Tankless Water Heater Vent Terminals
We prioritized compatibility, wall-clearance profile, vent style, and material durability. For Low Profile Tankless Water Heater Vent Terminals, the best options are the ones that match your heater type first, then fit your wall conditions and local venting requirements.
We also looked for straightforward installation features such as included screws, clear sizing, and designs that reduce protrusion without sacrificing proper exhaust performance.
Quick Comparison
In general, the products here fall into three groups: compact horizontal terminations for tight spaces, concentric or vent-cone styles for specific system layouts, and larger-format kits for non-condensing or higher-clearance applications. Your heater type and vent pipe size should narrow the field quickly.
Key Buying Factors for Low Profile Tankless Water Heater Vent Terminals
Heater Compatibility
Confirm whether your unit is condensing or non-condensing, and whether it uses single-wall, concentric, or PVC venting. A terminal that looks similar can still be incompatible with your heater model or vent configuration.
Vent Diameter and Wall Projection
Match the terminal to the exact pipe size, such as 2-inch or 3-inch systems. If the goal is a cleaner exterior appearance or limited wall space, pay attention to the stated length and how far the unit extends beyond the wall.
Material and Weather Resistance
Stainless steel and quality plastic both have a place, depending on the application. Look for materials rated for outdoor exposure, moisture, and temperature changes, especially where the vent end is exposed to wind and rain.
Code and Clearance Requirements
Local codes may govern termination height, spacing from openings, and distance from grade or property lines. A low profile design should still meet all clearance rules, so do not choose size alone.
Who Should Buy Which Low Profile Tankless Water Heater Vent Terminals?
If you have a condensing tankless unit and need the shortest possible wall profile, look for compact horizontal or concentric options that are explicitly designed for that system. If you own a non-condensing heater, choose a terminal made for that vent style rather than adapting a general-purpose kit.
For installers working on tight exterior walls, utility spaces, or finished facades, Low Profile Tankless Water Heater Vent Terminals are often the best balance of function and appearance. If you are unsure, match the heater manual first, then verify the vent size, termination style, and required clearances before buying.
