Gas vs. Electric Tankless Water Heater

What do both gas and electric tankless water heaters do? They provide hot water. If they deliver the same duty, why do we side with either of them?

The reasons will depend on the region, preference, and overall expenses. A potential buyer will have to consider many factors to compare and come to a decision. It is not often possible due to the lack of information.

This gas vs. electric tankless water heater guide will help you figure out which unit is fit for your house.


You must not install these units without a professional’s supervision. In fact, we suggest hiring a qualified expert.

Electric Tankless Water Heater

Now, a gas tankless water heater, such as Rinnai RUR98iN Ultra Series, is complicated to set up. You have to ensure the venting system at home is compatible with the water heater. That means more modifications to spend money on.

An electric unit like the Stiebel Eltron Tankless Heater is much easier to install due to the less complicated system. They are smaller to fit in any storage area without upgrading the power structure.

Gas Tankless Water Heater

However, you will have to reconsider the option if the house has old electrical systems.

Installation Winner: Stiebel Eltron Tankless Heater, Electric

Hot Water Flow

Remember that the 8 GPM is sufficient for an average family to enjoy hot water consumption.

A tankless gas water heater is capable of over 8 GPM hot water deliverance. Electric ones are limited to up to 8 GPM.

Electric Tankless Water Heater

Usually, a gas water heater is ideal for a large household, whereas electric water heaters may not provide enough hot water if the incoming water flow is too cold.

Hot Water Flow Winner: Rinnai RUR98iN Ultra Series, Natural Gas

Operating Cost 

While the electricity cost is more than the gas bill, the efficiency rate is higher in electric tankless systems than the gas tankless water heaters.

It means the Stiebel Eltron Tankless Heater can produce more hot water than Rinnai RUR98iN Ultra Series. However, some areas have reversed operating costs.  

Tankless Water Heater

The efficiency level will also vary depending on where you live.

Operating Cost Winner: Stiebel Eltron Tankless Heater, Electric


You might have to spend more time maintaining a gas tankless water heater to ensure the proper performance and safe fuel combustion.

On the contrary, Stiebel Eltron Tankless Heater offers minimal repairs as long as the filters are clean.

Electric Tankless Water Heater

Maintenance Winner: Stiebel Eltron Tankless Heater, Electric


The price factor is unavoidably higher considering the unit Rinnai RUR98iN Ultra Series. You will have to plan a budget of $1,000 if you want to acquire additional features.

Gas Tankless Water Heater

Also, you can opt for a non-condensing system; however, installing them will require spending a lot all the same.

On the other hand, Stiebel Eltron Tankless Heater is significantly affordable, where the maximum pay-up should be within $700.

Tankless Water Heater

Price Winner: Stiebel Eltron Tankless Heater, Electric

Final Words

The verdict in gas vs. electric tankless water heater is based on your requirements. Hence, we suggest consulting a professional before making up your mind.

Some areas provide better gas suitability while other focus on power efficiency. Try to correspond with the most advantageous option to avoid an increase in operating cost.

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