Tested by us in our USA laboratory. this model is aesthetically pleasing and has simple design features that make this unit easy to use and install as well as unobtrusive if located within view of working spaces. This model delivers up to 3.2 gallons per minute of consistent and continuous hot water at a 45°F rise. With low water pressure ignition, this heater can function under 0.02Mpa (2.9 Psi) of water pressure. No plug-in is required, making this the perfect unit for garage, barn, or outbuildings. This "No pilot light" design is safe and convenient, using automatic ignition to further your energy savings. (The ignition electrical source is supplied by two "D" cells) For example; As tested in our USA laboratory, this unit can easily operate via a garden hose inlet water supply. This unit is an excellent choice for persons needing occasional on-demand hot water. Our LP model is ideal for use during hunting or camping expeditions, or you may chose to use this heater for semi-permanant OUTDOOR installations at long term camp sites, small lake homes or cabins. Or for those who live in remote rustic cabins and homes with one bath.