A "boiler" is a device that is used to heat water, usually by using gas or electricity. The heated water can be used for various purposes like central heating, hot water supply, or cooking. Full definition
Place top of double boiler in bowl of ice and beat frosting with electric mixer about 5 minutes or until it reaches spreading consistency. (biggirlssmallkitchen.com)
Fire - rated doors provide optimum safety for boiler rooms, rooms with oil tanks or any other area more prone to fire within the home. (thefashionablehousewife.com)
And some agents are working in boiler room call centres where they're driven. (hoyes.com)