Many Choices of Instant On Demand Hot Water Heater Units

Apparently there are quite a few options in the on-demand, instant hot water department! We've seen the Quooker instant boiling water faucet, as well as the very interesting but not-yet-available Vulcanus MK4 microwave based hot water heater. There is also Chronomite Tankless, as well as Niagara Industries whole house tankless hot water heater. If you're browsing, Froogle produces no shortage.

With ever increasing energy costs, and given that traditional water heaters account for up to 20-30% of a homes energy use, tankless water heaters are becoming more attractive to homeowners.

The US Department of Energy has some information on tankless water heaters, including a section on whether the devices would work in your home. From the site:

For homes that use 41 gallons or less of hot water daily, demand water heaters can be 24%?34% more energy efficient than conventional storage tank water heaters. They can be 8%?14% more energy efficient for homes that use a lot of hot water?around 86 gallons per day. You can achieve even greater energy savings of 27%?50% if you install a demand water heater at each hot water outlet.