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2. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   In traditional plumbing in the UK, the space-heating boiler is set up to heat a separate hot water cylinder or water heater for potable hot water. Such water heaters are often fitted with an auxiliary electrical immersion heater for use if the boiler is out of action for a time. Heat from the space-heating boiler is transferred to the water ...

3. Patio heater - Wikipedia

   en.wikipedia.org/wiki/Patio_heater

   Distance from heater 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

4. Gas heater - Wikipedia

   en.wikipedia.org/wiki/Gas_heater

   Upright non-flued liquefied petroleum gas heater, 1970s A wall mounted gas heater that runs on either propane or natural gas. A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane, or butane. Indoor household gas heaters can be broadly categorized in one of two ways: flued or ...

5. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   A hybrid water heater is a water heating system that integrates technology traits from both the tank-type water heaters and the tankless water heaters. [6] It maintains water pressure and consistent supply of hot water across multiple hot water applications, and like its tankless cousins, it is efficient and can supply a continuous flow of hot ...

6. Propane - Wikipedia

   en.wikipedia.org/wiki/Propane

   HD-5 is a specification that establishes a maximum concentration of 5% propene in propane. Propane and other LP gas specifications are established in ASTM D-1835. [46] All propane fuels include an odorant, almost always ethanethiol, so that the gas can be smelled easily in case of a leak. Propane as HD-5 was originally intended for use as ...

7. Water-tube boiler - Wikipedia

   en.wikipedia.org/wiki/Water-tube_boiler

   The older fire-tube boiler design, in which the water surrounds the heat source and gases from combustion pass through tubes within the water space, is typically a much weaker structure and is rarely used for pressures above 2.4 MPa (350 psi). A significant advantage of the watertube boiler is that there is less chance of a catastrophic failure ...