Boilers have long been used to provide heating for homes and buildings, but their energy efficiency has increased dramatically in recent years. Today’s new technologies boast energy-saving features, such as electric ignition, computerized controls and the latest combustion technologies, to further maximize efficiency. 

High-efficiency boilers can:

  • Save on heating costs
  • Improve the comfort of your facility
  • Reduce the potential for equipment failure during the heating season
  • Protect against future increases in the price of natural gas

Upgrading to an energy efficient boiler

If your boiler is old, worn out, inefficient, or oversized, it may be time to replace it with a modern high-efficiency model. Older boilers have efficiencies in the range of 56%–70%, while modern conventional heating systems can achieve efficiencies as high as 97%, converting nearly all the fuel to useful heat. And, because boiler efficiency has improved so much over the years, you may find that a smaller (and less costly and less energy-hungry) boiler can meet your building's needs just as well as, or better than, your old, inefficient one. 

Focus on Energy recommends buying a boiler with annual fuel utilization efficiency (AFUE) rating of 90% or greater. The higher the AFUE of a boiler, the more efficient it is. Also look for a boiler that modulates the heat output and with an outdoor temperature reset to maximize comfort and efficiency. Energy efficiency upgrades and a new high efficiency heating system can often cut your fuel bills and your furnace's pollution output in half. Proper installation is also important. Your new boiler must be installed properly to ensure that it operates safely and efficiently. An improperly installed boiler can result in higher energy costs and a less comfortable home. 

If you have installed a high efficiency furnace or boiler and there is no other equipment vented through your chimney, the interior flue should be sealed off to reduce heat loss through the opening in the roof. By closing the flue, you will prevent the escape of warm air from your house—increasing your comfort, and saving energy and money. 

Connect with an expert!

Focus on Energy is your source for objective, third-party information and advice to help you make smart energy decisions that save money. Take advantage of expert advice, technical assistance, and financial incentives. 

Focus on Energy works with local Trade Allies such as vendors and contractors to deliver energy-efficiency services throughout Wisconsin. Visit our search tool to find a Trade Ally to assist you with your energy-efficiency or renewable energy project today. Call 800.762.7077 or email with your energy efficiency needs and learn how Focus on Energy can help you save energy and money today! 

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