The Onsen 26L Indoor Gas Tankless Water Heater delivers instant hot water with higher heating power and increased flow capacity, making it ideal for 2-bath family homes, townhouses, and cottages. CSA certified for indoor installation in Canada and the USA, the 26L is also well-suited for 1-bath homes that require extra performance when running multiple fixtures at the same time, especially in colder climates.

Compact indoor design: direct-vent system supports installation in restricted spaces

Electronic ignition (120V): no pilot light, powered by a standard household outlet

Easy temperature control: LED display with three preset heating modes

Energy savings: operates only when hot water is needed

Certified for indoor use: CSA approved for Canada and the USA

Professional-grade venting (included): Z-Vent 3" Category III stainless steel wall vent kit, UL 1738 & ULC-S636 certified, engineered to withstand high-acid exhaust condensate that can prematurely deteriorate standard metal venting

Insulated air intake kit (included): UL-181 Class 1 & ULC-S110 certified insulated air intake duct supplies combustion air from outdoors, helping maintain temperature stability, reduce condensation, and limit vibration

What’s included:

Onsen 26L Indoor Gas Tankless Water Heater

Z-Vent 3" Category III Stainless Steel Wall Vent Kit

• Termination hood
• 90° elbow
• Wall thimble
• 12" straight pipe
• 18" straight pipe
• Appliance adapter with backflow preventer

Insulated Fresh Air Intake Kit

• UL-181 Class 1 & ULC-S110 certified insulated aluminum intake duct (4–10 ft extendable)

Important notes

• For indoor use only.
• Available in Propane or Natural Gas versions. Units are factory-set and cannot be converted between gas types.
• Gas Supply Line: A ¾-inch gas supply line is recommended to ensure sufficient propane flow to the unit. While a ½-inch line may work on very short pipe runs, it is not recommended for optimal performance.
• Not suitable for: hydronic, closed-loop, recirculating, or floor-heating systems.