Why use an instantaneous water heater?

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keyboard_arrow_upWhat to consider when using instantaneous water heaters?
keyboard_arrow_downWhat to consider when using instantaneous water heaters?
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?