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  2. Biomass heating system - Wikipedia

    en.wikipedia.org/wiki/Biomass_heating_system

    The heat created by the combustor can be used to directly heat the air or it can be used to heat water in a boiler system which acts as the medium by which the heat is delivered. [3] Wood fire fuelled boilers are most efficient when they are running at their highest capacity, and the heat required most days of the year will not be the peak heat ...

  3. Jetstream furnace - Wikipedia

    en.wikipedia.org/wiki/Jetstream_furnace

    Jetstream furnaces (later tempest wood-burning boilers), were an advanced design of wood-fired water heaters conceived by Dr. Richard Hill of the University of Maine in Orono, Maine, USA. The design heated a house to prove the theory, then, with government funding, became a commercial product.

  4. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    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. In colder climates, geothermal heat pumps can be used to extract heat from the ground ...

  5. The 10 Best Hot Tubs You Can Invest in for a Long, Cold ...

    www.aol.com/10-best-hot-tubs-invest-000000672.html

    4. Alfi Round Fiberglass Portable Outdoor Hot Tub. Best for the nomad who wants a wood-burning soak wherever they go. The old-school nature of this hot tub alone will have you intrigued.

  6. Ground source heat pump - Wikipedia

    en.wikipedia.org/wiki/Ground_source_heat_pump

    A heat pump in combination with heat and cold storage. A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a type of heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons.

  7. Can 'energy hog' hot tubs be greener? - AOL

    www.aol.com/energy-hog-hot-tubs-greener...

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