Answer: the storage heater produces heat at night and diffuses it during the day as needed.
The storage radiator is a type of radiant radiator which has the particularity of dissociating the production of heat and its restitution. Unlike other models that produce and distribute heat simultaneously, the storage heater produces heat at night (to take advantage of off-peak electricity rates), and stores it in a dedicated compartment made of refractory bricks. Then heat is emitted during the day by radiation as needed. It is very rare to find this type of radiators in personal or collective dwellings, they are rather used in office buildings at present. Because, the storage heater is by necessity heavy and bulky, and it requires a fairly high initial investment. You too, send us your brico question