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Measured in square feet, the reference standard for EDR is the mattress radiator [1] invented by Stephen J. Gold in the mid 19th century. One square foot of EDR is able to liberate 240 BTU per hour when surrounded by 70 °F (21 °C) air and filled with steam of approximately 215 °F (102 °C) temperature and 1 psi of pressure.
Propane and natural gas heaters Electric heaters 4 sq ft 1 foot 10,000 BTUs 1,000 Watts 16 sq ft 2 feet 36 sq ft 3 feet 64 sq ft 4 feet 100 sq ft 5 feet 46,000 BTUs 144 sq ft 6 feet 1,500 Watts 196 sq ft 7 feet 256 sq ft 8 feet 324 sq ft 9 feet Requires additional heater 400 sq ft 10 feet Requires additional heater
Medium-wave (MWIR) and carbon infrared heaters operate at filament temperatures of around 1,000 °C (1,830 °F). They reach maximum power densities of up to 60 kW/m 2 (5.6 kW/sq ft) (medium-wave) and 150 kW/m 2 (14 kW/sq ft) (carbon). Far infrared emitters (FIR) are typically used in the so-called low-temperature far infrared saunas. These ...
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Gas water heaters cost between $600 and $2,700 to replace, for an average cost of about $1,650. Electric water heaters cost between $600 and $3,500 to replace, for an average cost of about $2,100 ...
Keeping flammable materials, such as paper, plastics, curtains, furniture, and bedding, at least 3 feet (0.91 m) away from the heater. Turning off the heater when the last adult leaves the room or goes to sleep and keeping children and pets three feet away from the heater. Placing heaters on a flat, hard, nonflammable surface.
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Of the 21,000,000 square feet (2,000,000 m 2) of solar thermal collectors produced in the United States in 2007, 16,000,000 square feet (1,500,000 m 2) were of the low-temperature variety. [13] Low-temperature collectors are generally installed to heat swimming pools, although they can also be used for space heating.
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