I like how Iceland does it.
A plant powered by hydroelectric power pumps volcano-melted steamy glacier water in scalding water pipes (past more lava sometimes, ohai Grindavik!) to homes in an entire village, for hot water and heat, along with electricity.
It's like their entire economy and survival is based on volcanoes melting glaciers. F'n primal.
We can't do that here, but it's a good system if you can get it and nothing melts all your glaciers away.