Chicago Marriott Downtown Magnificent Mile Hotel, Boilers

Utility incentives helped subsidize this $2.1 million infrastructure upgrade.

Chicago Marriott Downtown Magnificent Mile Hotel, exterior view, night

The Objective

The Chicago Marriott Downtown Magnificent Mile Hotel is a 1,200-guestroom luxury property in the city’s downtown Loop neighborhood. Centrally located on bustling Michigan Avenue, it features 68,000 square feet of event space and a 9,000-square-foot fitness center.

GBA provided engineering design and construction administration services for replacement of hot water boilers. The local gas utility provided $37,000 in incentives. The project also received a $9,000 incentive from the local electrical utility.

The Response

The project focused on replacing the hotel’s hot water boilers. Engineering design included:

  • Demolition and replacement of three hot water boilers with 14 modular boilers. The modular units offer a small footprint and increased efficiency over previous boilers (approximately 85% efficiency vs. 75%).
  • Conversion of the hot water distribution system to variable flow, with constant-speed primary boiler pumps and variable-speed secondary distribution pumps.
  • Replacement of secondary hot water pumps and provision of variable frequency drives.
  • Connection and extension of hot water piping.
  • Upgrades to heating plant building automation system controls.
  • Phased installation of hot water boilers, which also provide domestic hot water for the hotel, to ensure continuous availability of hot water in the guest rooms.
  • Metering and tracking of natural gas consumption and hot water use by zone.
  • Modifications to the ventilation system that provides combustion air to the equipment room.
  • Replacement and upgrades of power connections to the mechanical equipment.
  • New electrical distribution equipment, transformers, and lighting layout.

Modular units with a smaller footprint and better efficiency

Upgrades to the distribution system and the BAS controls

Phased installation to ensure continuous availability of hot water to guests

Metering and tracking of gas consumption and hot water use by zone

The Results

Construction Budget

Utility Incentives


Efficiency of Boilers

Modular Units

Bar, Chicago Marriott Magnificent Mile Hotel.
Marriott Chicago Magnificent Mile, suite