A type of heating appliance that performs more than one function, for example space and water heating.

The lowest wind speed at which a wind turbine begins producing useable power.

Infrared or radiant heat.

The water content of a substance (a solid fuel) as measured under specified conditions being the: Dry Basis, which equals the weight of the wet sample minus the weight of a (bone) dry sample divided by the weight of the dry sample times 100 (to get percen ...

Pounds/force per square inch gauge.

Metal, usually galvanized sheet metal, used to provide protection against infiltration of precipitation into a roof or exterior wall; usually placed around roof penetrations such as chimneys.

The relative extent that energy is required for a process.

A building that is elongated in the east-west direction, with the majority of the windows on the south side. The area of the windows is generally limited to about 7% of the total floor area. A sun-tempered design has no added thermal mass beyond what is a ...

A slightly sloped roof, usually with a tar and gravel cover. Most commercial buildings use this kind of roof.

Any liquid petroleum product burned for the generation of heat in a furnace or firebox, or for the generation of power in an engine. Domestic (residential) heating fuels are classed as Nos. 1, 2, 3; Industrial fuels as Nos. 4, 5, and 6.

A device that that converts direct current electricity (from for example a solar photovoltaic module or array) to alternating current for use directly to operate appliances or to supply power to a electricity grid.

A toilet that uses less water than a standard one during flushing, for the purpose of conserving water resources.

The ability to dispatch power.

Materials that prevent or slow down the movement of heat.

Waste water from a household source other than a toilet. This water can be used for landscape irrigation depending upon the source of the greywater.

A column of gas at standard conditions of temperature and pressure (32 degrees Fahrenheit and one atmosphere).

The height above the ground that a horizontal axis wind turbine's hub is located.

The flow rate in these systems is 1/8 to 1/5 the rate of most solar water heating systems. The low-flow systems take advantage of stratification in the storage tank and theoretically allows for the use of smaller diameter piping to and from the collector ...

One pound of water in vapor phase; is NOT steam pressure, which is expressed as pounds per square inch (psi).

The fluid, liquid (water or water/antifreeze solution) or air, used to absorb solar energy and transfer it for direct use, indirect heating of interior air or domestic water, and/or to a heat storage medium.