When selecting a vent kit for a tankless water heater, the goal is safe, code-compliant venting that minimizes debris entry and supports easy installation. This guide highlights five practical vent kit choices that fit most 3″ to 2″ diameter exhaust pipes and common installation layouts. Each option is best for specific setups—ranging from flat, horizontal runs to concealed, low-profile venting. The selections below help buyers compare materials, compatibility, and installation considerations at a glance.
Quick product snapshot:
- GASLAND 3″ Stainless Steel Vent Pipe Kit — Great for horizontal runs on many residential tankless models.
- CAMPLUX 3″ Horizontal Stainless Steel Z-Vent Kit — Flexible for indoor gas tankless units with standard 3″ venting.
- Rheem RTG20280-1 ProTech Horizontal Vent Termination Kit — Durable stainless steel with a complete wall plate for secure mounting.
- Vent Kit for Tankless Water Heater and Wood Stove — 2.36″ pipe for combined venting needs with wood stoves.
- DiversiTech HVENT2 2-Inch Horizontal Vent Termination Kit — Low-profile, aesthetically pleasing for high-efficiency systems.
GASLAND 3″ Stainless Steel Vent Pipe Kit for Gas Tankless Water Heaters
The GASLAND kit is designed for horizontal vent runs on residential tankless water heaters. It combines multiple 3″ pieces, including a termination hood, a 90-degree elbow, and vent pipes in sizes suitable for a customizable installation. Best for homeowners who prefer a modular, easy-to-assemble venting solution and who prioritize corrosion resistance and temperature tolerance thanks to T304 stainless steel. Limitations include the need for precise measurement and alignment to ensure a leak-free seal across all joints.
CAMPLUX 3″ Horizontal Stainless Steel Z-Vent Kit
The CAMPLUX kit is a detachable horizontal vent solution designed for indoor gas tankless water heaters. Its 3″ diameter aligns with many CAMPLUX models and similar heaters, and it includes a termination hood, wall thimble, and elbow. It’s well-suited for installations where space is constrained or a clean, compact vent path is desired. Choose this if you need a flexible length assembly. Note that compatibility with non-CAMPLUX units may require adapters or verification of compatible elbow and hood components.
Rheem RTG20280-1 ProTech Horizontal Vent Termination Kit
The Rheem ProTech termination kit emphasizes a durable stainless steel construction with a complete wall plate assembly and an angled 94-degree elbow for easier vent routing. Best for homeowners who require a robust, field-tested solution that accommodates up to a 10″ wall thickness. The kit is well-suited for larger installations in well-ventilated spaces. A potential limitation is its compatibility scope limited to certain Rheem non-condensing water heaters, so verify model compatibility in advance.
Vent Kit for Tankless Water Heater and Wood Stove
This kit features a 2.36″ diameter pipe in a 14.56″ length, crafted from premium 304 stainless steel for corrosion resistance and high-temperature performance. It’s a practical choice for venting both gas water heaters and wood stoves, offering solid safety and consistent exhaust management. Best for multi-appliance setups where a standard vent path intersects with a stove. A limitation is potential size restrictions if your vent run differs from the 2.36″ diameter target.
Concentric Vent Kit – 2 in.
The Concentric Vent Kit from Rheem is a 2-inch solution intended for specific installations and OEM-grade replacements. It’s easy to install and uses a factory-authorized part approach. Best for replacements within Massachusetts and New York constraints where the OEM path is preferred. The kit’s limitation is regional approvals that may restrict its use in certain jurisdictions, so confirm local code acceptance before purchase.
DiversiTech HVENT2 2-Inch Horizontal Vent Termination Kit
The DiversiTech HVENT2 is designed for high-efficiency appliances, including tankless gas water heaters, with a low-profile design that conceals both intake and exhaust. This kit is best for installations where a streamlined exterior look and reliable venting performance are priorities. It can accommodate standard horizontal runs but may be less suitable for longer, complex routing compared to modular 3″ systems. Consider this when seeking a tidy, finished installation.
Buying Guide: Key Considerations For Tankless Vent Kits
- Vent diameter compatibility: Most units here use 3″ or 2″ fittings. Confirm your heater’s exhaust diameter before purchasing.
- Installation layout: Horizontal runs, wall plates, and elbows influence kit selection. Measure the available space and wall thickness to ensure a proper fit.
- Material and corrosion resistance: Stainless steel (especially 304) offers durability and longer service life in high-heat exhaust environments.
- Local codes and approvals: Some kits have regional restrictions or require OEM-specific parts. Verify local code compliance before installation.
- Ease of assembly: Detachable or modular kits simplify cutting and joining, but ensure all components (hoods, elbows, thimbles) are included for your layout.
- Debris and weather protection: Look for low-resistance designs that guard against debris and rain entry to the vent path.
Frequently Asked Questions
- What is a tankless water heater vent kit used for?
It provides a safe and code-compliant exhaust path for combustion gases from tankless water heaters, often including termination hood, wall thimble, elbows, and vent pipes. - Do these kits fit all 3″ vent systems?
Most are designed for standard 3″ diameter venting, but always confirm compatibility with your specific model and venting code requirements. - Is stainless steel necessary for vent pipes?
Stainless steel offers superior corrosion resistance and temperature tolerance, which improves long-term reliability in venting applications. - Can I mix components from different brands?
Mixing may be possible but is not recommended unless the components are explicitly compatible in diameter, connection type, and code compliance. - Should I hire a professional for installation?
For gas appliances, professional installation is advised to ensure proper venting, seal integrity, and code adherence. - What are signs of improper venting to watch for?
Backdraft, unusual odors, condensation in unexpected areas, or excessive heat around the vent path can indicate issues.