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Directory:Tankless Water Heaters

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About

What is a Tankless Water Heater?

Tankless water heaters are home appliances used to heat water for residential or commercial use. Also known as 'on demand' and 'instant' water heaters, tankless are designed to heat the water as the water flows through. Unlike conventional tank water heaters, tankless do not have any type of storage tank. Tankless water heaters come in natural gas, propane, and electric models. Tankless water heaters can be broken down into two categories; 'full on/full off' and 'graduated'. Full on/full off units do not change the power output at all. The unit is either on or off. Graduated tankless water heaters base the power output on the flow of water running through the unit. This is usually done through the use of a 'flow switch' and means that you will receive the same output temperature of water at .5 gallons per minute (gpm) as you will at 3.0 gpm.

Because energy is not required to maintain a tank of water at a high temperature, the net energy savings can be substantial on site. However, if enough people implement this practice in a city, it creates a peak electricity problem that can end up wasting more energy than is being saved.

Advantages

Only heats the water as you need it, so there is no need to maintain a tank of hot water during all those times when it is not needed.

Purported to cut water-heating bills by 60%, giving a 10 - 18-month payback time, depending on the vendor.

Disadvantages

If enough people implement this practice in a municipality, it creates a peak electricity problem that can end up wasting more energy than is being saved.

In the News

  • Tankless Water Heaters are Brutal on the Grid When Popularized - Tankless water heaters draw energy on demand, and do not have a thermal energy storage facet. Multiplied by many customers' hot-water usage patterns, these surges of energy amount to a significantly higher peak load for utilities, resulting in increased costs and, more significantly, in increased waste during non-peak times. (PESN; Oct. 18, 2005)
  • Company Develops Microwave-powered Water Heater - MK4, a microwave-powered on-demand water heater. See comments about microwave inefficiency and peak metering. (Slashdot; Nov. 25, 2005)

Sites/Pages about Tankless Water Heaters

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See also

- Other directory listings
- PESWiki home page

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