What is an ETS Heating System?

No matter how many inspections I add to my tally, one thing never changes: I see something new in almost every home I inspect. The last inspection I performed had an ETS heating system, something I had only seen in textbooks previously.

What the Heck is an ETS?
An Electric Thermal Storage (ETS) system is a type of electric heating that stores heat during off-peak hours: typically at night when electricity demand (and cost) is lower and releases that heat gradually throughout the day. Instead of generating heat on demand like traditional electric heaters, ETS systems “charge up” in advance and distribute warmth when it’s needed. 

At the core of an ETS system are high-density ceramic bricks. During off-peak hours, electricity heats these bricks to very high temperatures. The stored heat is then released in a controlled manner using fans or natural convection, keeping indoor spaces comfortable without drawing large amounts of electricity during peak times. Like any heating systems, there are benefits and drawbacks to this type of heater. 

A wall mounted ETS unit.... and an inspector's foot.

Benefits of ETS Heating

1. Lower energy costs compared to regular electric baseboard heaters.
2. Energy Efficiency with consistent heat, avoiding temperature swings. 
3. Takes advantage of time of day pricing, when electricity is significantly cheaper. 
4. Very little maintenance with no surprise bills or unexpected breakdowns.

Drawbacks of ETS Heating

1. High upfront costs. 
2. Large units that require much more space. 
3. Limited flexibility, especially with sudden outdoor temperature changes. 
4. Hard to inspect compared to most other systems. 

Compared to traditional baseboard heaters, ETS systems are clearly more cost-effective over time once the initial cost is paid off. How do they stand up against ductless mini-split heat pumps? It depends. ETS may be less efficient in mild climates but can outperform in extremely cold conditions where heat pump efficiency drops. In other words, it depends on where in Nova Scotia you live and how cold that specific winter is. ​

Electric Thermal Storage heating systems represent a thoughtful approach to energy use: shifting consumption to more efficient times while maintaining comfort throughout the day. While they require a higher initial investment, the long-term savings and environmental benefits make them a compelling option for many households.
If you’re considering upgrading your heating system, ETS technology is worth a closer look, especially if you’re aiming to balance cost, comfort, and sustainability but they are not a panacea!