What to consider when using instantaneous water heaters?

All COMPANY videos
keyboard_arrow_upWhy use an instantaneous water heater?
keyboard_arrow_downWhy use an instantaneous water heater?
keyboard_arrow_upHow does an instantaneous water heater work?
keyboard_arrow_downHow does an instantaneous water heater work?
keyboard_arrow_upHow does a heat pump work?
keyboard_arrow_downHow does a heat pump work?