An Electric thermal storage heater is an electrical heating appliance which stores thermal energy during the evening or night. This is the time of day when electricity is available at a lower cost. It then releases the heat at specific times during the day as required. Storage heaters store the heat in bricks typically composed of iron or other ceramic material.
Electric thermal storage heaters earn their keep by storing heat when electricity is less expensive so it is critical to ensure the heater is storing the heat during Off-Peak times set by your utility!
Off-Peak rates vary in duration of time, some utilize a 7 hour Off-Peak, others 8 hours, 10 hours and 12 hour Off-Peak are also common in some areas of North America. Rates also change at different times, therefore it is important to ensure proper controls to turn off and on your storage heater.
Some Utilities will offer Mid-Peak rates, which are generally a lower cost per kilowatt than On-Peak rates, yet higher per kilowatt cost than Off-Peak. All of this is important for two key reasons;
- you want to ensure you store enough heat in the Off-Peak period
- you want to ensure you are maximizing your savings by storing the heat utilizing less expensive Off-Peak electricity
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