http://www.househacker.com/ househacker/tags/instant 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.

]]> http://www.househacker.com/permanent/Many-Choices-of-Instant-On-Demand-Hot-Water-Heater-Units instant hot water these days. According to Canada's Globe and Mail, a company called Pulsar Advanced Technologies is about to announce a product that uses microwave technology to instantly heat hot water. According to the article, the Vulcanus MK4 "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 Vulcanus MK4 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." This is exciting news for anyone tired of being at the mercy of natural gas prices, not to mention those just looking to reduce their energy footprint.]]> http://www.househacker.com/permanent/New-Microwave-Based-Water-Heater-Announced Quooker sells a nice looking product that produces instant boiling water, straight from the tap. The faucet draws the boiling water from an insulated tank mounted underneath the counter, where water is heated to 110°C. As the water flows from the faucet, it cools to 100°C. Quooker says that the unit's energy consumption is "next to nothing" in standby mode. I wonder if it would melt one of these.

Caution! The boiling water you are about to enjoy is hot...]]> http://www.househacker.com/permanent/Instant-Boiling-Tap-Water