In a craft such as an aircraft, a lavatory unit may be powered by the various outputs of a fuel cell system, including by-products that typically become waste. For example, but not limited to, a combination of the water, oxygen-depleted air, thermal energy and/or electrical energy generated by the fuel cell system may be used to supply water to the faucet and the toilet of the lavatory unit, to supply the lavatory unit with its electrical needs, and to heat and/or disinfect and/or dry the lavatory unit and its surfaces.
