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2. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   A supply of fuel, electric power or district heating supply lines; A boiler (or a heat exchanger for district heating) which heats water in the system; Pump to circulate the water; Radiators through which the heated water passes in order to release heat into rooms. The circulating water systems use a closed loop; the same water is heated and ...

3. List of boiler types by manufacturer - Wikipedia

   en.wikipedia.org/wiki/List_of_boiler_types_by...

   donkey boiler: A donkey boiler is used to supply non-essential steam to a ship for 'hotel' services such as heating or lighting when the main boilers are not in steam, for example, when in port. [3] Donkey boilers were also used by the last sailing ships for working winches and anchor capstans. See also auxiliary boiler.

4. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   Condensing boiler manufacturers claim that up to 98% thermal efficiency can be achieved, [3] compared to 70%–80% with conventional designs (based on the higher heating value of fuels). Typical models offer efficiencies around 90%, which brings most brands of condensing gas boiler in to the highest available categories for energy efficiency.

5. List of United States natural gas companies - Wikipedia

   en.wikipedia.org/wiki/List_of_United_States...

   Providence Gas Company (National Grid plc) Rhode Island Energy; South Carolina. Piedmont Natural Gas; SCANA Corporation; Lancaster County Natural Gas Authority; Patriots Energy Group; York County Gas Authority; Chester County Gas Authority; Fountain Inn Natural Gas; SCE&G; Dominion Carolina Gas Transmission; Fort Hill Natural Gas Authority ...

6. Boiler - Wikipedia

   en.wikipedia.org/wiki/Boiler

   Early boilers provided this stream of air, or draught, through the natural action of convection in a chimney connected to the exhaust of the combustion chamber. Since the heated flue gas is less dense than the ambient air surrounding the boiler, the flue gas rises in the chimney, pulling denser, fresh air into the combustion chamber. [citation ...

7. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   For older houses where the water heater is part of the space heating boiler, and plumbing codes allow, some plumbers install an automatic gas shutoff (such as the "Watts 210") in addition to a TPR valve. When the device senses that the temperature reaches 99 °C (210 °F), it shuts off the gas supply and prevents further heating.