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Clean and Renewable

Electric Thermal Storage Heaters

Available for SIEA members only

Electric thermal storage (ETS) heaters: What they are and what they do

ETS is a heating technology designed to store electric heat during the off-peak hours of the day when electricity costs are cheaper, saving you money. A super-insulated storage cavity containing ceramic bricks is charged (heated) to approximately 1,400°F and is stored for use during the on-peak hours of the day when electricity costs are higher. A fan forces air over the heated bricks sending the warm air into the room throughout the day; keeping you at a comfortable temperature while using a minimal amount of electricity. The ETS unit’s surface temperature is also safe for children to be near as it does not harm or burn when touched. When a member chooses to install an ETS unit they become eligible for a special time-of-use rate class, which allows the ETS unit to charge during off-peak times, when electricity is cheaper, and discharge the stored heat during peak times, when electricity is more expensive.


ON-PEAK RATE: $0.149 per KwH OFF-PEAK RATE: $0.076 per KwH (first 1,000 KwH) Power GREATER than 1,000 KwH: $0.062 per KwH OFF-PEAK TIMES SUMMER: (MAY – AUGUST) 11:00 p.m. – 7:00 a.m. WINTER: (SEPTEMBER – APRIL) 11:00 p.m. – 7:00 a.m. & 10:00 a.m. – 4:00 p.m. $30 Access Charge Per Month

ETS Rebates

  • $40/KH                 ETS unit
  • $12/KH                 ETS thermal slab

To claim a rebate:

  • San Isabel Electric must be your power utility.
  • Submit a completed rebate request form.
  • Requests must be made within 120 of product purchase.
  • SIEA offers more than 30 rebates. A full list of SIEA rebates is available at siea.com/rebates, as well as a rebate request form.
  • Please submit a paid invoice or receipt for each product rebate request.