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2. Template:Convert/list of units/volume/metric - Wikipedia

   en.wikipedia.org/wiki/Template:Convert/list_of...

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3. Litre - Wikipedia

   en.wikipedia.org/wiki/Litre

   One litre of water has a mass of almost exactly one kilogram when measured at its maximal density, which occurs at about 4 °C. It follows, therefore, that 1000th of a litre, known as one millilitre (1 mL), of water has a mass of about 1 g; 1000 litres of water has a mass of about 1000 kg (1 tonne or megagram). This relationship holds because ...

4. Energy factor - Wikipedia

   en.wikipedia.org/wiki/Energy_factor

   The energy factor metric only applies to residential water heaters, which are currently defined by fuel, type, and input capacity. [5] Generally, the EF number represents the thermal efficiency of the water heater as a percentage, since it is an average of the ratio of the theoretical heat required to raise the temperature of water drawn to the amount of energy actually consumed by the water ...

5. Here's How Often You Should Drain Your Water Heater ... - AOL

   www.aol.com/heres-often-drain-water-heater...

   Fortunately, a water heater can last for many years with regular yearly maintenance. “A conventional tank water heater can last as long as 12-15 years, but it is common to see them fail in 8-10 ...

6. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Direct electric resistance tank water heaters are not included in the Energy Star program; however, the Energy Star program does include electric heat pump units with energy factors of 200% or higher. Tankless gas water heaters (as of 2015) must have an energy factor of 90% or higher for Energy Star qualification.

7. Water (data page) - Wikipedia

   en.wikipedia.org/wiki/Water_(data_page)

   Up to 99.63 °C (the boiling point of water at 0.1 MPa), at this pressure water exists as a liquid. Above that, it exists as water vapor. Note that the boiling point of 100.0 °C is at a pressure of 0.101325 MPa (1 atm), which is the average atmospheric pressure.