Per Article in Globe and Mall:
Pulsar Advanced Technologies, Town of Mount-Royal, Canada, has announced that it will launch its lead product, the Vulcanus MK4, a tankless water heater using microwave technology to heat water on demand. This technology with super-heating capabilities will drastically cut energy costs and totally eliminate the need to store hot water. The Vulcanus MK4 is making its world premier at Construct Canada in Toronto between Nov. 30 and Dec. 2, 2005.
The technology is designed to eliminate the deadly Legionella Pneumophila, since water will not stagnate, as it does with conventional hot water heaters. It can heat water from 35 degrees Fahrenheit to 140 degrees Fahrenheit in seconds and can source multiple applications at once: showers, dishwasher, sink usages and more. The unit is the size of a stereo speaker with a sleek modern look, making it ideal for condos and apartments, while powerful enough to serve the needs of any size family.
Courtesy of the Engineer Poet:
Microwaves are not magic. Generating microwaves is a lossy process. You can turn on a magnetron in a fraction of a second (if its filament is hot), but you're going to lose up to half the input power as heat in the device itself.
Point 1: It is impossible for a microwave-based water heater to require less energy or deliver hot water faster than an on-demand resistance heater.
Point 2: It is very unlikely that the microwave heater will have lower losses, because it will need to keep its filament powered for instant-on operation, and the heat dissipated in the magnetron (which will have to be water-cooled) will leave some unusable heat in the machine itself when the water stops flowing. That energy is lost.
Engineer Poets comment incorporated 11/28/2005.
Resource: Pulsar announces water heater using microwaves, GLOBEANDMALL.COM, November 22, 2005