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storage heater

British  

noun

  1. an electric device capable of accumulating and radiating heat generated by off-peak electricity

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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His electric storage heater "eats electricity like it's going out of fashion", and he watches his smart meter constantly, worried that his tariff could change at any time.

From BBC • Jan. 16, 2022

He “posts” important letters and bills down the back of the storage heater and radiators.

From The Guardian • Apr. 7, 2016