We have the Tiny Titan that you can get at Loews hardware in the U.S. It is in a plastic case, so it never rusts and in 12 years we've only had to replace the heating element and thermostat once. It is an on demand water heater, electric, and serves the whole upstairs of our building which has 8 bedrooms, 4 baths and 3 kitchens. Its about a 1 foot cube.