If your business is using gas to heat water, you should consider a CO2 Heat Pump!  If your business also has a cooling requirement, you can drive further efficiencies.
For example, indoor swimming pools can heat water in pools and, depending on the configuration, provide some concurrent cooling to the indoor air space.
Hotels can potentially provide hot water for guests and provide concurrent cooling to chilled water systems for cooling rooms.
Food processing facilities such as dairies can generate industrial grade hot water for cleaning while cooling down their milk!
Heat pumps are an extremely flexible technology.  Glaciem specialize in determining how they can best help your business!