Residential Gas Tankless Water Heaters (Propane or Natural Gas)

Choose from our two residential tankless water heaters: Onsen 14L and Onsen 26L.
Need help choosing your Onsen? View the comparison chart.

Why choose an ONSEN tankless water heater?

Safe for small indoor spaces!

Onsen's indoor residential water heaters are equipped with an electronic ignition powered by a standard 120V outlet, activated by water pressure and flow. Its direct vent system pulls air from the outside, preventing the loss of warm indoor air and allowing for flexible installation even in restricted spaces.

Energy-Efficient Water Heaters for Off-Grid Living

Our water heaters require less than 1 amp of power, making them perfect for both remote off-grid locations and residential installations. With minimal energy consumption, they offer reliable hot water while being energy-efficient, whether you're using solar power or standard electricity.

CSA-Certified and loaded with safety features

CSA Certified for both the USA and Canada, Onsen's residential tankless water heaters are equipped with multiple protective functions to ensure safety and reliability—monitoring the temperature of the water being produced and adjusting the burner accordingly to deliver a stable hot water supply.

Trusted Canadian Shopping Experience

Enjoy fast, reliable shipping from Canada, a 60-day refund/return policy, and friendly and local customer support.