My wife and I have a tiny cabin on a piece of mountain land that has a water supply, in the form of a frost-free water spigot, but no other utilities. We bought the L5 two years ago when we got tired of heating water for washing and showers in a pan on our Coleman stove. The L5 makes this glorified camping spot feel luxurious. The heater weighs about 12 pounds, making it easy to move back and forth between the spot where we wash dishes and a small enclosure I built for taking showers. When we leave, we disconnect it, drain it, and store it the cabin. The heater uses two D-cell batteries to run its automatic igniter. In two years of summer-weekend use, we've not yet had to replace the batteries. The heater has two controls: a water-flow dial and a gas-flow dial. In practice, you just turn the gas dial to and adjust the temperature by varying the water flow. When adjusted to a decent temperature for a hot shower, the flow is perfectly adequate. The heater must be used outdoors. Conceivably, you could mount it to the outside of a cabin and pipe the hot water inside. The water outlet accepts the same kind of flexible water supply hose you use to connect a sink's faucet to your household water supply.