Two on-demand steam boilers are helping craft distiller Death’s Door Spirits maintain quality, save fuel and reduce emissions at its Middleton, Wis., distillery. Death’s Door Spirits is a craft distiller known for its vodka, gin and whiskey that uses organic wheat from Washington Island, Wis. The brand is named after Death’s Door Passage, a turbulent Lake Michigan waterway separating Washington Island from the northeast Wisconsin mainland.

Death’s Door Spirits
For distillers, steam quality and pressure are important as fluctuations in temperature or pressure can lead to congeners, or unwanted flavors.

In addition to the organic grains for its products, Death’s Door Spirits takes pride in its craftsmanship, whether due to its approximately 580-gal copper-pot still or the company’s two LX-100 SG steam boilers from Miura, Atlanta.

Mike Rebier, director of operations for Death’s Door Spirits, wanted boilers that would provide the lowest cost of maintenance and the highest return on his investment. For distillers, steam quality and pressure are important as fluctuations in temperature or pressure can lead to congeners, or unwanted flavors. Miura boilers are microprocessor controlled and employ a once-through fin-tube design that uses less water, requires less fuel, produces fewer emissions, conserves space and produces steam from a cold start in less than five minutes.

This on-demand steam-generation feature enables users to precisely match load fluctuations as they occur, instead of consuming energy while boilers idle in stand-by mode. Miura boilers’ output results in reduced levels of both NOXand carbon dioxide (CO2). The boilers achieve low-NOX performance by reducing the boiler's flame temperature. “Miura’s low-NOX output is lower than even the emissions limits set by the state of California,” Reiber says. In addition to the advanced fin-tube design, every Miura boiler includes an advanced diagnostic system that keeps track of multiple individual monitoring points. A sliding-window feature records events four seconds before they occur for troubleshooting.

This system can be accessed via the Internet for remote monitoring and diagnostics. Death’s Door Spirits also opted for Miura’s water monitoring feature that helps prevent scale buildup inside the boiler, an economizer to capture and reuse waste heat, and a water treatment chemicals package that is used in combination with the distillery’s own reverse-osmosis water system to conserve chemical usage.