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New Corporate Headquarters for Major Wisconsin Firm Applies Grundfos Pump Technology To Drive Energy Savings

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McCotter Energy Systems increased heating and cooling pumping efficiency with cutting-edge Grundfos technology

Since 1956, McCotter Energy Systems has provided commercial HVAC and boiler room solutions for customers in Wisconsin and Upper Michigan.



Client: Major Wisconsin firm with $400M+ in annual revenue.

Application: Pumping systems for chilled water, hot water & condenser water for new corporate headquarters.

Challenge: Quantifying the advantages of Grundfos technology.

Solution: Provided up-front Energy Analysis projecting ROI of less than 10 years and thousands of dollars in energy savings per year.


  • Installation of:
    • 4-Pump Grundfos Hydro MPC skid for heating loop 1,220 GPM @ 135 ft. hd.
    • 5-Pump Grundfos Hydro MPC skid for cooling loop 2,100 GPM @ 145 ft. hd.
  • Pump system commissioning and owner training provided by McCotter Energy Systems

Learn More About Grundfos Pump Systems

The Challenge

Moving past a 100-year-old solution

For over 100 years, base-mounted end-suction pumps have been the standard for HVAC pumping systems. However, Grundfos is challenging the conventional wisdom by engineering, designing and providing high efficiency packaged pumping solutions. Grundfos packaged Multi E and Hydro MPC systems improve on traditional solutions by saving space, reducing the cost of ownership/maintenance and increasing pump efficiency and functionality.

Applying the Grundfos Hydro MPC skids for the client’s new headquarters was a great solution, but it meant rethinking the justifications and benefits of applying base mounted end suction pumps. The contractor, design team and client weren’t ready to dismiss this approach without validating the Grundfos solution.

A Different Approach

Investigating the potential of an innovative design

The McCotter Energy team provided an up-front energy analysis comparing standard end suction pumping methods to the innovative Hydro MPC design, and provided data to the consulting engineer for independent verification.

The specific recommendation for the hot water and chilled water pumping systems was the Grundfos Hydro MPC, a pump skid system with parallel vertical multistage pumps and intelligent controls. The advanced Grundfos Hydro MPC controller continuously calculates the optimal combined efficiency for the pump array, controlling and cascading the pumps accordingly to match the variable heating/cooling load.

Compared to end suction pumps with variable frequency drives (VFD), the Hydro MPC has superior turn down and wire-to-water efficiency. When operating at minimum speed (30 Hz) end suction pumps still often require flow bypass to keep them from cavitating. The 10:1 turndown of the Hydro MPC eliminates the requirement and operational costs associated with bypassing flow.

Results & Successes

Leading the industry

After careful consideration, investigation and analysis the client, design team, and contractor selected the Grundfos Hydro MPC for the project. McCotter Energy Systems provided the systems on-time and on-budget.

HighlightsEquipment installed included:

4-Pump Grundfos Hydro MPC skid for the heating loop

5-Pump Grundfos Hydro MPC skid for the cooling loop with two blanked-off connections for future cooling expansion

The installation cost was nearly the same for a base-mounted end suction pump versus a Hydro MPC. However, McCotter Energy Systems’ analysis revealed that using an efficient Grundfos Hydro MPC would save thousands of dollars in energy costs per year.

Not only was the client convinced that Grundfos pumps were the best solution, but the mechanical contractor also became a strong Grundfos partner. Many of the contractor’s projects now include the Hydro MPC.

For McCotter, showcasing Grundfos technology was about more than validating their recommendation—it was about getting their customer the most efficient and reliable system for the application.

By partnering with trusted manufacturers and fully supporting every installation, McCotter has built a reputation for integrity and reliability.

Do you want to see Grundfos pump technology working for you?

McCotter Energy Systems can recommend the right Grundfos equipment to boost pumping efficiency, save space, reduce maintenance costs and save energy for your next project.

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