It is probably difficult or non-sensical to run a gas line or store natural gas on-site at an office building simply to heat the water for washing hands. I ass

It is probably difficult or non-sensical to run a gas line or store natural gas on-site at an office building simply to heat the water for washing hands. I assume the same office building does not have hot showers or baths, either. My questions, though, does his home hot water heater use gas or electricity to heat the water?