ABSA 5th Class Practice Exam 2025 – Complete Guide for Test Prep

An instantaneous water heater is more commonly known as a tankless water heater. This type of water heater heats water directly without the use of a storage tank. When hot water is needed, cold water travels through a pipe into the unit, where it is heated by either gas or electricity. This design allows for a constant supply of hot water, as water is heated on demand rather than being stored.

In contrast, a storage water heater, also known as a tank-type water heater, stores a certain amount of hot water in a reservoir, which can lead to running out of hot water during high demand. A condensing water heater, while another option, refers to a specific type of water heater that uses the heat from exhaust gases to improve efficiency, but it doesn’t specifically denote the instantaneous aspect. Therefore, tankless is the most accurate term synonymous with instantaneous water heaters.