FYI: thermal-storage furnace

Specially-designed ceramic bricks help efficiently and economically store heat.

What is a central thermal-storage furnace?

A central thermal-storage furnace uses specially designed ceramic bricks to store heat during off-peak hours, when electric rates are lowest.

Central thermal-storage furnaces can be combined with a heat pump—such as an air source heat pump or a cold-climate heat pump—to reach all-season comfort with an overall winter-season efficiency of 150% to 250%.

Benefits of a central thermal-storage furnace

Central thermal-storage furnaces are clean and quiet. In addition:

  • By-product free — There are no combustion by-products in a central thermal-storage furnace
  • Effective — Designed to work with high efficiency to heat an entire building
  • Economical — When combined with our low off-peak rates, buildings get economical and efficient heating

How do they work?

Like all thermal-storage systems, you can think of a thermal-storage furnace as a kind of “heat battery.”

Unique and specially-designed, the ceramic bricks within a thermal-storage furnace store heat during off-peak hours. Then, when it’s time to warm up, heat is transferred through the building—either as heated air flowing through ductwork or through heated liquid flowing through floor heating.

Combining a central thermal-storage furnace with a cold-climate heat pump allows for a pairing of strengths—first, the heat pump operates at high efficiency to meet most of your heating and all of your cooling needs. Then the thermal-storage furnace is ready to provide the remainder of your heating needs during the coldest weather at 100% efficiency. Heat is stored throughout off-peak hours and available to provide comfort during the coldest weather. 

Rebates and off peak rates are available

Install a thermal storage system on a qualified off-peak rate and receive a rebate as well as energy priced at 25% to 50% less than our standard price. 

Contact our Idea Center or call 800-493-3299 to learn more.

Related programs

Residential Business

Deferred Load Rate

Store now, use later—save up to 30% on your heating and cooling costs by switching to our Deferred Load Rate.

Electric heating rebates

Rebates are available for several electric-heating technologies.

Fixed Time of Delivery Rate

Set your energy delivery to off-peak hours to store heating and cooling power for the day—all at one of our lowest prices.

Heat pump rebates

Install the most efficient and environmentally friendly heating and cooling system on the market and start saving big!

Thermal-storage systems

Add a thermal-storage system to a new building or upgrade an existing system and get up to $75 per kilowatt in rebates.

Residential Demand Control

Partner with us to manage energy-system peaks and get a rate that’s about 25% lower than standard for all the energy you use with our Residential Demand Control (RDC) Rate.