Tankless (gas or electric) water heaters (on-demand) might be suitable for many situations. I think they're far more common in Europe. https://www.energy.gov/e

Tankless (gas or electric) water heaters (on-demand) might be suitable for many situations. I think they're far more common in Europe. https://www.energy.gov/energysaver/tankless-or-demand-type-water-heaters https://www.energy.gov/energysaver/tankless-or-demand-type-w...