Gas Condensing Boilers - Gas Fired - Pulse Combustion
Considerations For Using Gas Condensing Boilers
The escalating utility rates along with the fact that boilers are capable of consuming its initial cost in fuel several times over during a one year has many engineers and contractors scrambling to develop cost-efficient gas condensing boilers. This will give consumers the perfect alternative to save money and the environment at the same time. Before choosing gas condensing boilers, one must consider the type of HVAC system in place, the life-cycle costs, and the needs of the owner as they relate to single and multi-unit applications. High efficiency is achieved when additional heat released from a condensing flue gas is captured. The return water has to be below 140 F in order for flue gas to condense. Therefore, gas condensing boilers are most appropriate for low-temperature systems.
There are two basic types of gas condensing boilers: gas fired combustion and pulse-combustion. Both of these use a sealed combustion air supply through intake piping and direct vent products. One difference between the two is that pulse-combustion boilers do not require burners. Pulse combustion boilers also make more noise than the gas fired boiler. This is an important consideration when deciding the appropriate unit to purchase.
Savings from Using Gas Condensing Boilers
Gas condensing boilers cost more than their non-condensing counterparts, but they can last longer when they are properly installed and maintained. On average, the gas condensing boiler costs $2,000 more, but consumers will see an energy savings of $400 per year. This is a 20 percent return on an investment that is paid back in five years.
The environment also benefits from gas condensing boilers because less nitrogen oxide is produced, exceeding all environmental standards. Knowing the annual fuel utilization efficiency (AFUE) is a good way to compare the different boilers on the market because all manufacturers publish their AFUE ratings. A good gas condensing boiler, such as the Slant/Fin B-120-NG Bobcat, will have an AFUE between 90 and 94 percent. The Bobcat B-120 has a 93 percent AFUE, is easy to handle and can be installed on the floor, or mounted to the wall. The price for this unit is $2,899.95, which is an average cost for this type of boiler.
A final point for consideration is safety. As technology advances, the number of available products will increase, but those with the American Society of Mechanical Engineers stamp will ensure that all safety standards for these gas condensing boilers are met.