Traditional Japanese homes in Takano River looked like that. In the cold winter months, it would really be nice to have a tankless water heater.  I remembered my host family having to take turns because they wouldn’t have so much hot water to go round the entire household and i feel extremely bad, because they always let me have a hot bath first.. since i am the guest.  I really wished i could send them one now .. since they had been so nice to me.. during my 6 months stay in Japan.