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Location: Tiffin, Ohio

The Client

Heidelberg University is a private, non-profit institution established in Tiffin, Ohio in 1850. Heidelberg enrolls over 1,300 students annually. The 110-acre campus houses 1,110 students in seven residence halls.

The Challenge

Miller Hall Dormitory and the attached
Hoernemann Refectory had a much higher Energy Utilization Index (EUI) rating than other buildings on campus. The buildings, which encompass 66,460 sq. ft., were both served by an end-of-life non-condensing hot water boiler. To keep the building fully operational, equipment replacements needed to be addressed within a tight timeline in the shoulder months, when heating and cooling would not be needed.

The Solution

  • Plug Smart replaced the end-of-life boiler with a new high-efficiency hydronic heating hot water boiler plant that significantly reduced the gas consumption as compared to the existing system.


  • Converted three-way valves to two way valves in dorm rooms for variable flow pumping.


  • Paired the system with non proprietary, open-front-end BACnet controls, which allow for better set point control, comfort control, smarter heating and cooling, and advanced energy efficiency strategies.


  • Plug Smart identified and secured $50,600 of utility rebates associated with the project.




349,493 kWh

Annual Energy Savings


Total Annual Savings

—Rod Morrison,

Heidelberg University

Associate VP of Facilities

"One of the great things about working with Plug Smart was their ability to respond to the unexpected. Because the renovation work and projects involved existing buildings and equipment, there were a couple fairly serious issues that happened beyond the original scope. They were poised and quick to respond to those, and never were thrown off course by what was encountered. It didn’t cost us any money or any more time, and they kept their promises, just as they committed at the beginning of the project.”

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