From Longman Dictionary of Contemporary Englishtea urnˈtea urn noun [countable] British English DFDDFUa large metal container that you use for heating water to make a lot of cups of tea
Examples from the Corpus
tea urn• A Victorian stuff-over settee made £320; a mahogany hexagonal occasional table, £200 and a Sheffield plate tea urn, £170.• Eyes turned again to the tea urn. 