What are the Differences Between Tankless and Instant Hot Water Heaters?

When it’s about providing a constant and convenient supply of hot water, tankless asn instant hot water heaters have taken the position of traditional water heaters with storage tanks.

Both technologies aim to provide energy-efficient solutions that ensure instantaneous gas hot water on demand, but they do so in slightly different ways. In this article, we’ll delve into the nuanced differences between tankless and instant hot water heaters, helping you make the correct decision for your specific needs.

Operating Principle

Tankless Water Heaters

Tankless water heaters are also referred to as on-demand water heaters. They operate by heating water directly as it passes through the unit. These units are armed with high-power burners or electric heating elements that aids in heating the water instantly when a hot water tap is opened. 

That’s how they eliminate the need for storage tanks as their system knows how to generate hot water on the spot. 

Instant Hot Water Heaters

Tankless water heaters is another name that is used interchangeably with instant hot water heaters. However, it’s crucial to remember that the term “instant hot water heaters” is also used for smaller, point-of-use water heaters that are installed near faucets or appliances where hot water is needed.

The noticeable thing about these compact units is that they offer quick access to hot water without the need to run water through long pipes, thus reducing water wastage.

Energy Efficiency

Tankless Water Heaters

Energy efficiency is the best and one of the most significant benefits offered by the tankless water heaters. It’s because it heats the water only when required and eliminates the standby energy losses associated with traditional tank-based systems.

This way its users can get lower energy bills  and a reduced carbon footprint. The risk of getting out of hot water always scares us. Thanks to tankless system, that are particularly advantageous for homes with varying hot water demands

Instant Hot Water Heaters

Speaking of energy efficiency, point-of-use instant hot water heaters have a slight edge due to their proximity to the point of use. Also, there’s no water wastage as the system eliminates the requirement of running water for a long time before it reaches the desired temperature. 

Keep in mind that their efficiency is limited to few applications and can’t fulfill the instantaneous gas hot water demands of large families or entire households. 

Installation and Space Requirements

Tankless Water Heaters

Installing a tankless water heater is no doubt tricky and demands proper planning and expertise. For the best use, you need to fulfill some requirements like a dedicated gas line, electrical needs and adequate ventilation. It all depends on the unit’s model though. 

Moreover, they are comparatively compact and can be wall-mounted. Tankless water heaters are good choices for places with less area as they save valuable floor space if we compare with traditional water heater tanks. 

Instant Hot Water Heaters

Point-of-use instant hot water heaters are way too easy to install as they are manufactured for specific faucets or appliances. And definitely, no need for extensive plumbing modifications as they can easily be installed near any sink or shower.

This makes them an excellent choice for retrofitting in situations where a full tankless system installation might be impractical.

Hot Water Output

Tankless Water Heaters

With tankless water heaters, you can enjoy continuous supply of hot water making them ideal for larger households where there’s a dire need of using multiple hot water taps at a time. 

Their functionality to provide a constant flow of hot water ensures that you won’t run out, no matter the demand.

Instant Hot Water Heaters

Point-of-use instant hot water heaters are designed specifically for localised applications like single faucets or showers. Small-scale users are suggested to add this heater in their cart list now if they need a dedicated hot water source without affecting the main hot water supply.


If we draw conclusion in the debate – tankless vs instant hot water heaters? Both of the systems know how to offer effective solutions to its users along with energy efficiency. 

Whether you opt for a tankless system to cater to your entire home’s needs or decide on instant hot water heaters to provide rapid hot water to specific locations, both technologies represent significant advancements in water heating, delivering comfort and efficiency in their unique ways.

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