intelligent and packaged gas fired hot water boiler

Thermal insulation - Wikipedia
Thermal insulation is the reduction of heat transfer (i.e., the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radiative influence. Thermal insulation can be achieved with specially engineered methods or processes, as well as with suitable object shapes and materials.
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Indoor air quality - Wikipedia
Indoor air quality (IAQ) is the air quality within and around buildings and structures.IAQ is known to affect the health, comfort, and well-being of building occupants. Poor indoor air quality has been linked to sick building syndrome, reduced productivity, and impaired learning in schools.. IAQ can be affected by gases (including carbon monoxide, radon, volatile organic compounds
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