Energy Efficiency
Install/ Maintain High Efficiency Boilers

What Is It?

A high-efficiency boiler heats water with minimal wasted energy. A central furnace or boiler’s efficiency is determined by its energy used to heat compared to the energy wasted, a measurement known as annual fuel utilization efficiency (AFUE). An old boiler may have an efficiency rating of 68-72 percent AFUE, while a highly efficient one would have an AFUE of 90-97 percent. It is important to perform the manufacturer’s recommended check ups for any installed high efficiency boiler.


High-efficiency boilers have both energy-related and economic advantages. In older boilers, there is a pilot light that runs constantly, but newer models have an electronic ignition that starts only when needed. Traditional boilers use a draft method of ventilation, while the high-efficiency models have a ventilation system that is mechanically assisted. A 70 percent AFUE boiler upgraded to a 90 percent AFUE boiler would save an estimated $22 for every $100 spent on fuel, about a 20 percent savings in both cost and fuel emissions.

Read more about the benefits of high efficiency boilers.

Financing Options, Incentives, And Rebates

Additional Resources

Examples of Boston Area Business that Use High Efficiency Boilers:

  • None available at this time

A Small Sample of Providers and Installers around Boston: