I own a drive thru espresso stand with additional inside seating in Washington State. I had bought the property a few years ago. The building I converted to an espresso stand had breaker panels that were completely full.  Previous to me purchasing the commercial property, the building had never been used in the past during winter months. In eastern Washington ,we get the extreme temperatures, where temps go from low teens to over a hundred degrees depending on season . I have very high quality Mitsubishi AC unit that cools only. So my dilemma was how to add a 10,000 watt heater with no panel space. I either had to spend near 9,000 for a new heat pump unit with Cooling and Heating or put in a new panel and new service with was ridiculously costly. I came across a new product that uses one breaker space, the existing Mitsubishi breaker space, and gives the electrical need to the product that needs the power. It was so simple but I never heard of it. It was about a 1000 dollars and only took a few hours to install. It has been working without failure for three months 24/7.  Another bonus is it flips power automatically from Mitsubishi Cooling unit to Heater automatically when  thermostat settings have a few degree spread. I can see many applications where savings would be incredible instead of total retrofits. We are going have them installed in our Cannabis Grow Operation in our flower rooms for a similar issue.  Lake Chelan Marina Coffee Owner, Erik Ask