To answer a different way, in Paris, France, they are the largest users of district heating. What they do is replace a natural gas boiler or a propane or bunker fuel boiler. The earth boils the water first, and then it comes up and can be distributed to the houses. That replaces your forced air convection furnace. That still originates one to three kilometres down. It comes up to a centralized facility, and then they do district heating. It's very different from just one home or one facility.
On November 7th, 2017. See this statement in context.