Answering your search for reliable tankless water heater exhaust solutions, this guide compares five top exhaust vent kits and pipes. Each option is evaluated for compatibility, ease of installation, and long-term durability. Best for DIY homeowners, contractors seeking faster installs, and anyone upgrading an exhaust system for improved venting safety. The selections focus on common US sizing and material quality to help you choose confidently.
Summary of selected products:
- Vent Kit for Tankless Water Heater and Wood Stove — 2.36″ x 14.56″ 304 stainless steel vent pipe
- Rheem RTG20280-1 Tankless Horizontal Vent Termination Kit
- Rheem RTG20270A Tankless 6 in. Concentric Vent Pipe
- DiversiTech HVENT2 2-Inch Horizontal Vent Termination Kit
- Blulu Stainless Steel Direct Vent Pipe Kit for Tankless Water Heater — 3″ OD
Vent Kit for Tankless Water Heater and Wood Stove
Best for transitional setups where a single vent assembly serves a tankless heater and a wood stove. Constructed from premium 304 stainless steel, it offers corrosion resistance and durable performance at high temperatures. The 2.36-inch diameter and 14.56-inch length align with common US venting standards, enabling straightforward installation. This kit is ideal for homeowners upgrading existing vent runs or replacing aging pipes in shared exhaust applications.
Who this is for: handy homeowners tackling mixed exhaust projects and installers needing a corrosion-resistant, ready-to-fit vent pipe.
Caution: Ensure compatibility with your specific tankless model and wood stove clearances to avoid venting restrictions or backdraft concerns.
Rheem RTG20280-1 Tankless Horizontal Vent Termination Kit
Best for upgrading horizontal vent runs on Rheem or compatible tankless systems. This kit features durable stainless steel components and a complete wall plate assembly for secure mounting. The 12-inch wall plate and included mounting screws simplify installation, while the angled 94-degree elbow supports proper venting geometry. It is suited for homeowners seeking a robust, industry-standard termination option with predictable fitment.
Who this is for: Rheem-based installations or projects requiring a ready-to-mount termination with clear alignment.
Caution: Verify compatibility with your vent diameter and the chosen wall depth before purchase.
Rheem RTG20270A Tankless 6 in. Concentric Vent Pipe
Best for space-efficient installations where a concentric vent path is needed. This 6-inch concentric vent pipe emphasizes fast, one-step connections and a leak-proof gasket, with stainless steel construction for corrosion resistance. It is well-suited for tight mechanical layouts where a single, compact vent assembly reduces clutter and simplifies routing.
Who this is for: projects prioritizing compact vent geometry and straightforward assembly.
Caution: Check the available run length and elbow configurations to ensure a proper fit with your unit’s venting requirements.
DiversiTech HVENT2 2-Inch Horizontal Vent Termination Kit
Best for concealment-focused installations where the venting needs to look neat. This kit is designed to vent high-efficiency fossil fuel appliances like tankless water heaters and furnaces, with a low-profile design to hide intake and exhaust pipework for a tidy appearance. It supports proper venting essential for safe and reliable operation.
Who this is for: homeowners seeking a visually streamlined vent setup without sacrificing performance.
Caution: Ensure correct sizing for your appliance’s vent diameter and confirm wall clearance for the termination kit.
Blulu Stainless Steel Direct Vent Pipe Kit for Tankless Water Heater
Best for DIY projects needing a complete 3″ diameter vent option. This kit includes a 3″ OD elbow and a 3″ OD x 19.7″ horizontal termination pipe with a rain cap and clip. Constructed from 201 stainless steel, it offers high-temperature resistance and wear resistance, supporting longer service with reduced maintenance.
Who this is for: DIY installers or renovators requiring a straightforward, all-in-one venting solution.
Caution: The 3″ size must match the specific venting port on the heater and any surrounding ductwork constraints.
Buying Guide: Key Factors for Selecting Tankless Water Heater Exhaust
- Vent diameter compatibility: Confirm that the vent diameter matches your water heater’s exhaust port and any extension components.
- Material durability: Stainless steel helps resist corrosion and high temperatures; consider 304 vs 201 grades based on exposure.
- Installation simplicity: Look for complete kits with wall plates, elbows, and rain caps to minimize DIY steps.
- Concentric vs. side vent: Concentric designs save space; horizontal termination kits suit wall-mounted or compact layouts.
- Aesthetics and concealed routing: Low-profile or kit-integrated designs can improve interior appearances while maintaining airflow.
- Safety considerations: Ensure proper sealing, gasket integrity, and correct vent angle to prevent backdraft and gas buildup.
- Maintenance outlook: Choose corrosion-resistant materials and easy-access termination points to simplify future checks.
Frequently Asked Questions
- What diameter vent is common for tankless water heaters?
– Many units use 2 to 3 inches, but always verify your model’s specification and any regional codes. - Are concentric vent pipes better than standard side vents?
– Concentric designs save space and can simplify routing in tight spaces, but ensure compatibility with your heater. - Can I install venting components myself?
– DIY installation is common for select kits, provided you follow the manufacturer’s instructions and local codes. - What maintenance is needed for tankless exhaust systems?
– Regular inspections for corrosion, seals, and clearances help prevent leaks and ensure efficient venting. - How do I choose between a kit and individual vent pieces?
– A kit offers quicker, easier installation with matching components; individual pieces offer customization for unique layouts. - Are there safety certifications for vent kits?
– Look for products designed for high-temperature exhaust with appropriate installation documentation and code compliance.