In the sequence of storage heater supply control, when should supply be allowed?

• A. Only during off-peak hours
• B. All the time
• C. Only during peak hours
• D. Only when the meter reads high

Answer: (A)

The key idea is that storage heaters are charged during cheaper off-peak periods so that the stored heat can be released later for warmth. By allowing supply only during off-peak hours, you maximize the use of low-cost energy and avoid paying the higher rates that apply during peak times. Charging during peak hours would using expensive electricity when you don’t need heat immediately, and charging all the time defeats the purpose of taking advantage of the cheaper tariffs. The meter reading isn’t the factor here; tariff timing drives when the storage can be charged.