Outdoor Portable Tankless Water Heaters

Choose from our three outdoor portable tankless water heaters: Onsen 5L, Onsen 7L and Onsen 10L.
Need help choosing your Onsen? View the comparison chart.

Onsen 5L Outdoor Propane Portable Tankless Water Heater 32K BTU

from $249.00

Onsen 7L Outdoor Propane Portable Tankless Water Heater 50K BTU

from $318.00

Onsen 10L Outdoor Propane Portable Tankless Water Heater 75K BTU

from $389.00

Why choose an ONSEN tankless water heater?

Premium Features for Ultimate Convenience

Equipped with a high-quality shower head and digital display, Onsen’s portable outdoor water heaters operate seamlessly with a standard propane tank—great for hot water on the go.

Designed for Outdoor Adventures

The perfect addition to hunting camps, off-grid cabins, campsites, boats, pet grooming, horse stables, and backyard pool houses.

Portability with Dual-Ignition Power Options

Onsen is the only portable water heater with a dual-ignition system—use "D" cell batteries or connect to a 12V power source for ultimate flexibility and ease of use.

Trusted Canadian Shopping Experience

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

Which size is right for you?

When choosing your Onsen, the most important factor to consider is the temperature of your incoming water: the colder your incoming water, the more powerful the Onsen you need.

Onsen 5L

from $249.00

Lightweight & Portable
Outdoor
Propane
Dual Ignition
Heats Cool Water (above 60°F)
32,000 BTU/h
10 lbs
18.35 x 11.89 x 6.69 in.

Onsen 7L

from $318.00

Versatile & Compact
Outdoor
Propane
Dual Ignition
Heats Cold Water (above 45°F)
50,000 BTU/h
12.5 lbs
21.85 x 11.89 x 7.05 in.

Onsen 10L

from $389.00

High-Powered & Semi-Permanent
Outdoor
Propane
Dual Ignition
Heats Freezing Water (below 45°F)
75,000 BTU/h
19 lbs
25.83 x 13.43 x 8.19 in.