When the polio epidemic of the late 1940s and early 1950s struck, Vollrath developed the Polio-Pak Heater. Selling for $275, this 37"-high stainless steel electrical unit could produce 15 double-thick steam heated woolen packs to administer to patients afflicted with the crippling and often deadly disease. 

In addition to treating polio victims, the Polio-Pak Heater could also be used for treatment of infections, vascular and muscular congestion, and any physical therapy that required either hot moist or hot dry packs. Vollrath also developed a 20.5"-high portable size Polio-Pak Heater for visiting nurses to use in patients' homes.