The Ace features dual copper boilers and three adjustable points of heat. Users can independently set the temperatures in the 0.9-liter coffee boiler, the 2.75-liter steam boiler and a cartridge-heated group.

Fresh water drawn from either a direct plumbing line or an on-board 1.7-liter plastic reservoir is preheated by the steam boiler on its way into the insulated brew boiler. From there, a user-designated pre-infusion can be programmed to run for up to 10 seconds.