A typical commercial laundry uses thousands of gallons of water every day. In some cases, as much as 70% of it is hot, consuming millions of Btu’s worth of energy every hour. The ultimate goal is to make sure as many of those Btu bought from the gas company and brought into the building and run through your gas-fired appliances end up as usable energy. In the case of heating water, this would mean most of those Btu are present in the heated water rather than in a wasted state.
 
If we could convert every single Btu ...