Heats water only when needed (on demand).
Capacity unlimited as long as demand continues.
Compact design, ideal from smaller areas.
More eficient, only uses energy when water is in use.
Higher cost for unit and installation.
Average lifespan: 15-20 years.
Heats water instantly.
May struggle with simultaneous high demand (if undersized).
Needs regular filter cleaning and heat exchanger checks.
Homes seeking long term efficiency and endless hot water.