Until the last few years, combustion-based systems have been the preferred heating systems for home and business owners because of their moderate installation and operating costs, and wide availability in the market place. Unfortunately, there are a number of serious safety and related maintenance concerns with these systems. Some combustion-based systems present an explosion hazard if the storage or delivery of their fuel is not carefully controlled. Explosions due to improperly installed or maintained gas pipes and delivery systems are often in the news. Fortunately, smoke detectors have saved many lives that might have been lost to fires caused by combustion-based heating systems.
Carbon monoxide is a result of the incomplete burning of fuel in combustion-based systems.
Incorrectly installed systems, chimneys that are blocked by birds nests, or downdrafting can cause carbon monoxide to remain inside of buildings. This is especially dangerous in modern, well-sealed buildings, where it is difficult for outside combustion air to reach the furnace, and where carbon monoxide can be trapped and build up over time. Furnaces, water heaters, and other appliances must be properly vented outside. This not only reduces comfort directly, but tends to dehumidify the air. Combustion based central heating systems are often coupled with low-efficiency central air conditioners.