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2. Run-around coil - Wikipedia

   en.wikipedia.org/wiki/Run-around_coil

   A run-around coil installation, serving air handling units on the roof of an office building. A run-around coil is a type of energy recovery heat exchanger most often positioned within the supply and exhaust air streams of an air handling system, or in the exhaust gases of an industrial process, to recover the heat energy. Generally, it refers ...

3. Fireplace insert - Wikipedia

   en.wikipedia.org/wiki/Fireplace_insert

   A fireplace insert [1] is a device that can be inserted into an existing masonry or prefabricated wood fireplace. Fireplace inserts can be fuelled by gas, wood, electricity, coal, or wood pallet. Most fireplace inserts are made from cast iron or steel. Fresh air enters through vents below the insert, where it then circulates around the main ...

4. Outdoor wood-fired boiler - Wikipedia

   en.wikipedia.org/wiki/Outdoor_wood-fired_boiler

   The outdoor wood boiler is a variant on the indoor wood, oil or gas boiler. An outdoor wood boiler or outdoor wood stove is a unit about 4-6 feet wide and around 10 feet long. It is made up of four main parts- the firebox, which can be either round or square, the water jacket, the heat exchanger, and the weather proof housing.

5. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   External heat exchanger of an air source heat pump. An air source heat pump can be used to air condition the building during hot weather, and to warm the building using heat extracted from outdoor air in cold weather. Air-source heat pumps are generally uneconomic for outdoor temperatures much below freezing.

6. Back boiler - Wikipedia

   en.wikipedia.org/wiki/Back_boiler

   A back boiler is a type of boiler that is installed behind a fireplace or stove. It is designed to use the heat generated by the fire to heat water, which can then be used for central heating or hot water in a home. Back boilers were traditionally popular in the UK due to their compact design and dual-purpose functionality.

7. Thermosiphon - Wikipedia

   en.wikipedia.org/wiki/Thermosiphon

   The heat from the collector can be transferred to water in two ways: directly where water circulates through the collector, or indirectly where an anti-freeze solution carries the heat from the collector and transfers it to water in the tank via a heat exchanger. Convection allows for the movement of the heated liquid out of the solar collector ...

8. Rocket mass heater - Wikipedia

   en.wikipedia.org/wiki/Rocket_mass_heater

   Some people claim it consumes 10% of wood compared to a conventional wood stove. [3] [4] As the heat exchange mass absorbs and delivers most of the heat of combustion to the surrounding environment, it also provides a higher thermal efficiency. As a result, the exhaust temperature of a functioning rocket mass heater can average around 60–90 ...

9. Furnace (central heating) - Wikipedia

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

   The second category of furnace is the forced-air having atmospheric burner style with a cast-iron or sectional steel heat exchanger. Through the 1950s and 1960s, this style of furnace was used to replace the big, natural draft systems, and was sometimes installed on the existing gravity duct work.