Onsen 10L Outdoor Propane Portable Tankless Water Heater 2.6 Gal/Min 75K BTU with 3.0 Pump & 1.0L Accumulator


The Onsen 10L Portable Tankless Water Heater with 3.0 RV / Marine Diaphragm 12V Water Pump and 1.0L Accumulator Tank allows you to enjoy a hot shower outside anytime, anywhere.

Ideal for heating spring / fall water temperatures below 45°F / 7°C, the Onsen 10L turns freezing water into instant hot water on demand and features an electronic ignition (no pilot light and no wasted gas) activated by water pressure and flow.

Designed for the ultimate portability and accessibility wherever you roam, Onsen is the only portable water heater on the market featuring a dual-ignition system with two convenient options to choose from when you’re venturing outdoors. Get started with two “D” cell batteries or connect to a 12 volt power source.

The 12V Water Pump supplies the necessary water pressure to your tankless water heater while the small 1.0L Accumulator Tank acts as a pressure buffer to allow for a quieter, smoother flow and give you better control of hot water temperatures.

Featuring a premium shower head, digital screen and included 12V battery clips, the Onsen 10L runs on a standard propane tank and is perfect for hunting camps, off-grid cabins, camping, boating, pet grooming, horse trailers, stables or simply rinsing off by the pool.

Bring the comfort of Onsen to all your outdoor adventures!

Please note that pump water hoses shown in image are not included.

Out of stock

Additional information

Weight 19 lbs
Dimensions 25.5 × 13.5 × 7 in

Default Title


Model 10L
BTUs 75,000
Fuel type Liquid propane
Portable Yes
Water Pressure Requirement 10-80 PSI
Ignition system 2 “D” batteries / 12 volts
Max temperature 60°C / 140°F
CSA Listed No
Indoor/Outdoor Outdoor
Vent Type None required
Weight 19 lbs / 8.62 kg
Dimensions 25.5 x 13.5 x 7 in.
Warranty 2-year limited

Operating Manual

Operating Manual 10L Portable Tankless Water Heater Operating Manual Onsen 3.0 Diaphragm RV / Marine 12V Water Pump Operating Manual - Onsen 1.0L Accumulator Tank


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