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2. Masonry heater - Wikipedia

   en.wikipedia.org/wiki/Masonry_heater

   A masonry heater is defined by ASTM International as a "vented heating system of predominantly masonry construction having a mass of at least 800 kg (1,760 lb), excluding the chimney and masonry heater base. In particular, a masonry heater is designed specifically to capture and store a substantial portion of the heat from a solid fuel fire in ...

3. British thermal unit - Wikipedia

   en.wikipedia.org/wiki/British_thermal_unit

   It is the rate of heat transfer needed to freeze 1 short ton (907 kg) of water into ice in 24 hours. In the United States and Canada, the R-value that describes the performance of thermal insulation is typically quoted in square foot degree Fahrenheit hours per British thermal unit (ft 2 ⋅°F⋅h/Btu). For one square foot of the insulation ...

4. Rocket mass heater - Wikipedia

   en.wikipedia.org/wiki/Rocket_mass_heater

   Masonry heaters have been used since pre-historic times and have evolved into various designs in Europe, Russia, and China. The key principle is the incorporation of a large thermal mass built of masonry which absorbs heat from exhausting combustion products directed in a sinuous path through channels embedded in the masonry. [7] Construction ...

5. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   In some areas electrical resistance heating is used, especially where the cost of electricity is low or the primary purpose is for air conditioning. Modern high-efficiency furnaces can be up to 98% efficient and operate without a chimney, with a typical gas furnace being about 80% efficient. [ 1 ]

6. Thermal mass - Wikipedia

   en.wikipedia.org/wiki/Thermal_mass

   In building design, thermal mass is a property of the matter of a building that requires a flow of heat in order for it to change temperature. Not all writers agree on what physical property of matter "thermal mass" describes. Most writers use it as a synonym for heat capacity, the ability of a body to store thermal energy.

7. How Much Does It Cost to Replace a Water Heater? - AOL

   www.aol.com/much-does-cost-replace-water...

   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 ...