The answer to 'which is better tankless water heater or tank water heater' is that tankless water heaters are generally considered better in most situations. Tankless water heaters heat water on demand, providing a continuous supply of hot water without the need for a storage tank. This makes them more energy-efficient and space-saving compared to traditional tank water heaters. Tankless models also have a longer lifespan, typically 20 years or more, compared to 10-15 years for tank heaters.
However, tank water heaters can be a better choice for households with very high hot water demand, as they can provide a larger volume of hot water at once. Tank heaters are also generally less expensive upfront. Ultimately, the best option depends on your specific hot water needs, available space, and budget.