I’ll cite the etymology too.
Aga
[Acronym, f. the initial letters of Sw. Svenska Aktienbolaget Gasackumulator, Swedish Gas Accumulator Company, the original manufacturers.]
A proprietary name for a type of large cooking stove or range (and water-heater), burning solid fuel and (later) gas or oil. Freq. attrib., esp. as Aga cooker, stove.
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