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What are the Pros and Cons of Tankless Water Heaters?

Make the Right Purchase for You

When investing in a new hot water heater for your home, there are many options on the market. Should you go with a traditional water heater and constantly heat water, or is a tankless water heater a better option? We’ve compiled a list of the pros and cons of using tankless water heaters to help you decide which is best for you and your family.

Pros of a Tankless Water Heater

Save Money & Energy

Tankless water heaters save energy and save you money. Although traditional hot water heaters are insulted, this insulation does not prevent all heat loss. To provide on-demand hot water, a traditional hot water heater works to constantly heat the water in the tank. This constant heating can do a number on your energy bill and drive up your monthly cost. With a tankless water heater, you’ll have hot water, on-demand, without the added cost and energy use of a traditional hot water heater.

tankless water heater

Longer Lifespan

Tankless water heaters are known to last much longer than the traditional hot water heater—up to two times longer, in fact. While a traditional water heater has a lifespan of 10-12 years, a tankless water heater can last up to 20. If you plan to stay in your home for the long haul, investing in a tankless water heater can save you from a costly replacement down the road.



Space may be the most valuable reason to consider a tankless water heater. While traditional water tanks take up a lot of space with their 40-60-gallon tanks, tankless water heaters have a smaller profile. These heaters take up less than half the space of a traditional water heater, saving you precious space in your home.

Cons of a Tankless Water Heater

Water Output

With 40-60 gallons in reserve at all times, a traditional water heater has the capacity to function on a grander level, allowing multiple people to use hot water while showering, washing dishes, and running the washing machine all at the same time. With the smaller output of a tankless water heater, the capacity to run multiple heat flows at once is limited.  

water heater unit

Energy Requirement

Whether you choose an electric water heater or a gas water heater, you need to be aware of the immense output of energy needed upon starting a tankless water heater. Since a traditional water heater has reserves, it uses lower amounts of energy over time to heat its water. A tankless water heater requires a large amount of energy to begin producing the hot water needed. In some instances, you may need to choose electric over gas, or vice versa, for your tankless water heater depending on how much instantaneous energy is available through your gas or electric connection.



Although a tankless water heater will last you much longer, they do cost more upfront than a traditional water heater. Depending on which models you compare, tankless water heaters can cost anywhere from $200-300 more than a traditional water heater. But, with the added savings in your monthly energy bill, this additional cost may not affect your purchasing decision.


Whether you choose to go with a traditional or tankless water heater, ServiceMark can help. Our master plumbers receive more than 100 hours of technical training each year, so you can rest assured they are up-to-date on all the latest in residential system design and technology, helping you choose the best option for your space. Contact the ServiceMark team today!

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