Eccotemp 3" Stainless Steel Horizontal Vent Kit - 1779686047033_299
You may need to purchase additional straight pipe. You will need to determine how many additional feet you will need and determine if you need a condensation drain. Also remember there is a maximum vent run of 20 feet, subtracting 4 feet for every 90-degree elbow in the run.
Includes
- (1) 3" x 12" Straight Pipe
- (1) 3" x 90 Degree Elbow
- (1) 3" Adjustable Wall Thimble
- (1) 3” x 6" Universal Adapter
- (1) 3" Termination Hood w/Damper
What our Experts Think
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Purpose-built venting solution for tankless water heaters — This Eccotemp 3" Stainless Steel Horizontal Vent Kit is designed for safe horizontal exhaust of compatible tankless gas water heaters, helping properly route combustion gases outdoors for efficient and compliant operation.
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Durable stainless steel construction for long-term reliability — Built from AL-294C stainless steel, the kit is corrosion-resistant and engineered for Category II/III venting applications, ensuring durability in high-heat, moisture-prone exhaust environments.
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Complete installation-ready kit (core components included) — Includes essential parts such as a straight pipe, 90° elbow, adjustable wall thimble, universal adapter, and termination hood with damper for a streamlined horizontal installation setup.
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Designed for compatibility with multiple Eccotemp models — Works with select series including SH12-A, SHLX, 20HI, and builder-series tankless water heaters, making it a standardized solution across popular residential units.
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Optimized for horizontal venting layouts — Specifically engineered for wall-through installations where vertical venting isn’t feasible, helping simplify retrofit projects and space-limited installations.
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Flexible configuration with optional extensions — Additional straight pipe sections can be added to meet required vent lengths, and installations can be customized based on distance and elbow count limits.
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Things to consider before buying — Installation must follow strict vent run limits (including reductions for each elbow), and correct sizing and model compatibility are critical for safe operation; professional installation is strongly recommended.
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Best suited for: Tankless water heater installations requiring horizontal wall venting, residential upgrades, space-constrained utility rooms, and certified gas appliance setups.
Q&A
Q: What is the Eccotemp 3" Stainless Steel Horizontal Vent Kit used for?
A: It is a horizontal venting system designed to safely exhaust combustion gases from compatible indoor tankless water heaters through an exterior wall.
Q: Which water heaters is it compatible with?
A: It is compatible with several Eccotemp indoor models, including the 20HI Series, SHLX Series, SH12-A Series, 6GB Builder Series, and 6.5GB Builder Series.
Q: What is included in the vent kit?
A: The kit typically includes a 3" straight pipe section, 90° elbow, adjustable wall thimble, universal adapter, and termination hood with damper for safe exhaust venting.
Q: What material is it made from?
A: It is constructed from AL-294C stainless steel for high-temperature resistance, durability, and corrosion protection in venting systems.
Q: Is this vent kit certified for safety?
A: Yes. It is UL-approved and designed for Category II/III venting applications used in modern tankless water heater installations.
Q: What is the maximum vent length?
A: The system supports up to about 20 feet of vent run, with reductions required for each 90° elbow used in the installation.
Maintenance Tips
- Inspect vent joints every 3–6 months to ensure airtight, secure sealing and no exhaust leakage.
- Clean external termination hood regularly to remove dust, debris, insects, or spider webs.
- Check stainless steel pipe for corrosion, discoloration, or condensation buildup, especially in humid climates.
- Ensure correct slope and alignment so condensation drains properly and does not backflow into the unit.
- Verify all gasketed connections remain tight to maintain safe Category II/III venting performance.
- Keep exterior wall exit area clear of obstructions to maintain stable airflow and combustion efficiency.
- During annual service, inspect full vent run for blockages or loose fittings.
Damage 
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