We like to see the tankless water heater attached when we travelling and pick a condo or an inn. Especially when travel to northern europe, the device should be there or we can not take a bath during our holiday.
People need hot water to take a bath or other activity that need water in the cold season or cool place like that. We can not rely on the climate and hoping the sun with shine every day and every year. The water heater comes to help us and prevent cold disease during our holiday. Of course it is not relevant when we visit tropical country. At vinitankless site they are also have a great deal for every small inn owner to pick the right water heater that least for years.