British and Australian slang for a storage heater — those bulky electric units that soak up cheap off-peak electricity overnight and slowly release warmth through the day. The name 'heat bank' makes perfect sense: it stores thermal energy like a bank stores money, releasing it when you actually need it. Common in older UK and Australian homes, especially rentals or properties without gas central heating.
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UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
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The heat bank in the hallway had been charging all night, so the flat was actually warm when we got up.
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(UK, Australia) A storage heater.
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