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TV pickups occur during breaks in popular television programmes and are a surge in demand caused by the switching on of millions of electric kettles to brew cups of tea or coffee. Kettles in the UK are particularly high powered, typically consuming 2.5–3.0 kW and create a very high peak demand on the electrical grid.
A kettle, sometimes called a tea kettle or teakettle, is a device specialized for boiling water, commonly with a lid, spout, and handle. There are two main types: the stovetop kettle , which uses heat from a hob , and the electric kettle , which is a small kitchen appliance with an internal heating element .
Overall comparative efficiency can only be estimated by calculating the energy wasted by the water heater, and comparing it with that wasted by heating more water than necessary in a kettle in typical circumstances. Kettle efficiency is subject to patterns of usage, and can be improved by user discipline; dispenser efficiency cannot be so improved.
An 'efficiency' value for a kettle can be defined as the ratio of the energy required to heat a desired volume of water (e.g. 220 ml standard cup) to the energy required to boil the kettle. For the plastic kettle, the minimum volume mark corresponded to 350 ml. Add to this the additional volume for the heat capacity (105 ml) and the efficiency ...
A Kelly Kettle in use. Note the cork stopper is not in the water spout while water is being boiled, this is for safety reasons. Kelly Kettle, Storm Kettle, Ghillie Kettle, Thermette, Survival Kettle and Volcano Kettle are trade names for portable devices for boiling water outdoors using twigs and other small combustible materials; these devices consist of a water jacket surrounding a fire ...
Natural gas and propane tank water heaters with energy factors of 62% or greater, as well as electric tank water heaters with energy factors of 93% or greater, are considered high-efficiency units. Energy Star-qualified natural gas and propane tank water heaters (as of September 2010) have energy factors of 67% or higher, which is usually ...