Flash boiler

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1.A variety of water-tube boiler, used chiefly in steam automobiles, consisting of a nest of strong tubes with very little water space, kept nearly red hot so that the water as it trickles drop by drop into the tubes is immediately flashed into steam and superheated.
References in periodicals archive ?
The flash boiler means the Bru has a brew time of just five minutes and is available in a 1.
The inconvenience of waiting for the engine to warm up was largely negated by the flash boiler.