Case Study: Viessmann CM2 Boilers at Liberty Bank


New Viessmann CM2-186 Boilers at Liberty Bank

A Viessmann CM2 186 Boiler weighs  726 pounds. Two of them now sit at a Liberty Bank in Chicago’s Logan Square Neighborhood where Sherman Mechanical installed a boiler replacement system this fall.  Each of these Vitocrossal 200 models produces 643MBH output, together providing a redundant heating system for the bank’s heating needs while fitting in a small freight elevator and through a 36″ door.

Old Incinerator

Original incinerator from 1958

The bank was built in 1958 and still operated from much of the original equipment from the year it was built until this year. You can see the boilers during installation (below) and an old incinerator (left), both located in the basement. The Viessmann CM2 boilers can hold between 74 and 131 gallons of water and all have a max operating pressure of 75 psig.

The high mass capability affords these particular condensing, high-efficiency, boiler models to be a “drop-in” replacement of older vintage boiler styles such as cast-iron, which would normally require significant piping changes and other considerations.

CM2 Install

Viessmann CM2 boilers undergo commissioning

During the installation process, Sherman Mechanical also updated the piping by encasing them with insulation to reduce heat loss to bring the installation up to par with the 97% thermal efficiency offered by the CM2 boilers.

Finally, you can see the bank managers, Sherman Mechanical, and Gunn & Pegelow’s Michael John Hofer all in front of the completed boiler installation for a walk through of the system. We are confident they are going to love their new system and it will be there for a long while to come!

Owner training

Owner training


With each Viessmann boiler purchase, whether it is residential or commercial, owners are likely eligible to receive a rebate from the Nicor Gas Energy Efficiency Program.

Please contact Gunn & Pegelow if you are interested in learning more about Viessmann or if we can assist you with any of our other products!

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How to install and operate a Reznor Unit Heater

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Announcing Mars Air Doors in Indiana


indiana-mapGunn & Pegelow is proud to announce new representation of Mars Air Systems for the state of Indiana! Mars Air is the leading manufacturer of air curtains, keeping outside air and bugs out and inside air in.

Be sure to check out their website for more details or contact our own Lee McLaughlin at for more information!


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Our New Partner: Porter Pipe and Supply

Bull Dog      Since 1976, Porter Pipe & Supply has provided superior products and service to their customers to help them achieve their goals. They offer the highest quality products and services available on the market today.                                                                                                 With over 36 years of experience and commitment to excellence, they have earned their valued reputation as the best reseller in the Chicagoland area. Since 1976, Porter Pipe & Supply has provided superior products and services to the HVAC industry, helping their customers achieve their goals. Now they have expanded that offering to become the first stocking supplier of PDM US pre-insulated refrigerant lines in the Chicagoland area. With over 36 years of experience and commitment to excellence, they have earned and place high value in their reputation as the best reseller in the Chicagoland area. With PDM US, they are adding to their product options the best and most durable pre-insulated copper line sets made today.                                                                                                 Contact Porter Pipe & Supply today to find out how you can make your mini-split and variable refrigerant flow product installation the finest available.

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First Supply Receives Award From Reznor

 First Supply Receives Recognition as a Key Leader in Sales of Reznor

First Supply Award
          Lee McLaughlin congratulates Todd Montgomery, HVAC Sales Manager for First Supply Group, for their excellence in sales of Reznor Products in 2013.
         Reznor, Gunn & Pegelow and First Supply have worked together for more than 30 years supplying the Wisconsin/Northern Illinois areas with the finest commercial heating and cooling solutions available in the marketplace today.
        We are proud to have them as a key leader for us in this market.


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SoHo House, Chicago – Reznor Helicopter Lift

Check out this helicopter lift for the upcoming Soho House in Chicago of Reznor packaged heating and cooling makeup air units being placed on the roof! Thanks to Westside Mechanical for making this awesome video.

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Reznor Platform 125

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