What does a tankless water heater primarily provide?

A tankless water heater primarily provides a constant supply of hot water on demand. Unlike traditional water heaters that store a finite amount of hot water in a tank, tankless models heat water directly as it flows through the unit. This means that users can enjoy hot water continuously without the risk of running out, as there is no storage tank with limited capacity. This feature makes tankless water heaters particularly advantageous for households that require ample hot water simultaneously, such as during multiple showers or while running appliances that require hot water.

In contrast, options related to storage or reduced water pressure don’t align with the operational characteristics of tankless systems, as these heaters do not store hot water like conventional tanks do, and they do not inherently reduce water pressure. While increased energy efficiency is a notable benefit of tankless systems, which heat water only when needed, the primary function emphasized in the context of the question focuses on the constant availability of hot water.