Electrical Apprenticeship Technology 2 (T2) Phase 4 Practice Exam

Typically how many fire brick blocks are used in a storage heater?

Nine to twelve blocks One block Six to eight blocks Two to four blocks

Correct Answer:

Six to eight blocks

Explanation:

Storage heaters rely on thermal mass to store heat when electricity is cheap (usually at night) and release it gradually during the day. Fire brick blocks provide that stored heat inside the heater. The number of bricks determines how much energy can be stored and how quickly it can be released. Six to eight blocks is a common middle-ground that gives enough stored heat to carry useful warmth through the day without making the unit too bulky, heavy, or slow to respond. Too few blocks (like one or two) wouldn’t store much heat, while too many (nine to twelve) would overbuild the heater, increasing cost and weight and making heat release less controllable. So, six to eight blocks represents the typical, balanced design for a storage heater.

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