The answer to 'which is better tankless water heater or tank water heater' is that tankless water heaters are generally considered better than traditional tank water heaters for most homes. Tankless water heaters heat water on-demand as it's needed, rather than storing a limited supply of hot water in a tank. This provides several key benefits, including higher energy efficiency, unlimited hot water, and a smaller footprint.
Tankless water heaters are more energy-efficient because they only heat water when it's in use, rather than continuously keeping a tank of water hot. This can lead to significant energy and cost savings over the lifetime of the unit. They also provide an endless supply of hot water, as they can continuously heat water as it's needed. And since they don't require a large storage tank, tankless water heaters take up much less space in the home.