750 Melrose Avenue, Nashville, TN 37211
24/7 Live Person Response: 615-690-3600


Our company began in the field of hydronics and we have maintained this core competency. With more than 70 years of combined experience, our hydronics team is unmatched in Middle Tennessee. Our success is based on our firm, technical command of the systems and products we offer.


Our Partners

Through research, enterprising management, and proactive market pursuit, MRG has assembled these top of the line vendors as partners in our Hydronics division.


We represent the best boilers in the business—Hurst, Hydrotherm, and RBI—to provide environmentally
 friendly, high-efficiency boiler solutions.



MRG provides the highest quality pumps—Taco and Ebara. Designed and built to efficiently circulate heated or chilled water, they deliver performance you can depend on throughout their long service life.

Heat Transfer

MRG offers engineering and design assistance for any heat transfer application, regardless of type of construction or fluids. We can provide any type of shell and tube or plate and frame design.

Humidifiers and Steam Specialties

Our packaged solutions from Armstrong deliver best-in-class quality for humidification, steam, and condensate requirements.