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  2. Valve RF amplifier - Wikipedia

    en.wikipedia.org/wiki/Valve_RF_amplifier

    Thus while solid state high power short wave transmitters are technically possible, economic considerations still favor valves above 3 MHz and 10,000 watts. Radio amateurs also use valve amplifiers in the 500–1500 watt range mainly for economic reasons.

  3. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    An 80 US gal (300 L; 67 imp gal) electric storage tank water heater was able to have a minimum energy factor of 86% under the pre-2015 standard, while under the 2015 standard, the minimum energy factor for an 80-gallon electric storage tank water heater is now 197%, which is only possible with heat pump technology. This rating measures ...

  4. Unplug These Appliances That Hike Up Your Electricity Bill - AOL

    www.aol.com/unplug-appliances-hike-electricity...

    8. Aquarium Average Wattage: 4-104 watts Cost per Year: $4-$104 The main culprit of energy usage in your aquarium is the heater. Although you might not be able to unplug it depending on the ...

  5. Stock tank - Wikipedia

    en.wikipedia.org/wiki/Stock_tank

    See Stock tank oil for oil industry stock tank definition. A stock tank is used to provide drinking water for animals such as cattle or horses. Stock tanks can range in size from 100 liters to over 5500 liters (30 to 1500 gallons) and typically are made of galvanized steel. These tanks are filled either by a pump, windpump, creek, spring, rely ...

  6. Cartridge heater - Wikipedia

    en.wikipedia.org/wiki/Cartridge_heater

    A cartridge heater is a tube-shaped, heavy-duty, industrial Joule heating element used in the process heating industry, usually custom manufactured to a specific watt density, [1] based on its intended application. [2]

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