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Gas vs. Electric Tankless Water Heaters

Tankless water heaters are gaining huge popularity thanks to their energy efficiency, longer lifespan, and space-saving design.

May 05, 2026
Gas vs. Electric Tankless Water Heaters

Tankless water heaters are gaining huge popularity thanks to their energy efficiency, longer lifespan, and space-saving design. These water heaters work differently from traditional tank-based water heaters in that they provide hot water on demand. There are two main types of tankless water heaters:

Key Differences Between Gas And Electric Tankless Water Heaters

Our Customers Reviews

Larry R.

Howell Township, NJ

It was a late Saturday night. We had a super stubborn clog in some old galvanized pipes. Mr. Rooter send out Phil. Phil was great! He found the problem pretty quick. With determination and professionalism he final got it cleared out. I would recommend Mr. Rooter and Phil to anyone! He even cleaned up. We are so happy we choose Mr. Rooter!

Rose Bernard

Red Bank, NJ

We had a plumbing emergency and found Mr. Rooter while frantically searching for a 24-hour plumber. We feel like we hit a gold mine. Not only did we get a timely response. Everyone at Mr. Rooter was friendly, professional, competent and went above and beyond. Our plumber, Phil, was extremely helpful and gave us tips we could use moving firwars. Not to mention, the cost was extremely reasonable.

Joseph Chis

Hillsborough, NJ

Had sewer water backup in toilet and tub. Received callback as promised and arrived early. The tech determined we needed the main line to be cleared. He quickly located the opening and had us cleared in minutes. Very happy with the service. I was not prepared for the fee but it was an emergency.

Christopher Cox

Little Silver Township

Plumber, Phil, came out on short notice on a Saturday night and fixed our issue quickly, professionally and courteously. I contacted a different, well known plumbing company right before Mr. Rooter. The receptionist was rude and they didn’t call me back to say they couldn’t make it until after Phil left! The Mr. Rooter receptionist was very nice and they called me back quickly. I’m glad they did.

Debbie Dimitrion

Colts Neck, NJ

I just wanted to say James did a great job at my house. Excellent service, professional and very nice. Thank you so much for helping me with my plumbing problem. Did wonderful job.

Rachel Turunen

Jackson Township

I was very happy that I went with Mr. Rooter’s. The service was very quick and up front. Jessie James was very helpful answering my questions and replacing my hot water heater. He was pleasurable to do business with. If another problem arises in my home, I will be using this company again.

William Holden

Brick Township, NJ

A thorough, professional, pleasant experience. I had a back-up in the 50 year-old pipes of my new home. I called Mr. Rooter to have them locate the blockage, snake the line, and then use their video snake to get a visual of the integrity of the pipes. I’m glad that I called and will use them again for future needs.

LarJ MarJ

Oakhurst, NJ

You get what you pay for. Edwin Robles of Central NJ educated me as a 1st time homebuyer on why and what he was repairing, prevention, PROMPT,(on a sunday at that!) clean, knowledgeable, super professional but DOWN TO EARTH and at a REASONABLE PRICE! Sewer pipes unclogged and main water line fixed. I was no longer crying once job was thoroughly executed. After all $#@* $tinks but somebody has to do it and I HIGHLY recommend him and this company for a job well done. THANK YOU VERY MUCH!!

Margie Rafferty-Criscione

Ocean Township

Absolutely lovely office staff! I always knew when the repair person was coming. Lorenzo our repair guy was awesome, I really don't think there is anything he can't do. He looks young, but don't let that fool you! So happy all the repairs are behind us. We really just did a one-stop shopping and decided to have everything we've put off fixed because it was such a tremendous experience!

Gas vs. Electric Tankless Water Heaters

  • Electric tankless water heaters
  • Gas tankless water heaters

If you’re considering installing a tankless water heater in your home, it’s important to understand the key differences between these two types of water heaters. At Mr. Rooter Plumbing, we specialize in tankless water heater installation and water heater repair. We are conversant with the working mechanisms of both types of water heaters. Read on to lea more about gas vs. electric tankless water heaters.

As the name implies, gas tankless heaters use natural gas or propane as their energy source, while electric tankless heaters use electricity as their energy source. Apart from the energy source, there are several differences between these tankless water heaters.

  1. Efficiency

This is one of the major considerations when choosing between gas and electric tankless water heaters. Gas tankless water heaters tend to be more energy-efficient than their electric counterparts. They can achieve higher flow rates and provide hot water for multiple fixtures simultaneously. On the other hand, electric tankless water heaters are highly efficient when providing hot water for a single fixture or low-flow applications. However, their capacity decreases as demand increases.

  1. Installation

Electric units are compact and can be installed in various locations, including under sinks or in closets. They are suitable for homes with limited space or no access to natural gas. Gas units require proper ventilation and gas line connections, which can increase installation complexity and cost.

  1. Cost

Electric tankless heaters have a lower upfront cost compared to gas units. Installation is more straightforward and affordable. Although gas tankless heaters have a higher upfront cost due to installation requirements, they tend to have lower operating costs over time, especially in areas with low natural gas prices.

  1. Environmental Impact

Electric tankless units do not produce direct emissions on-site. While gas tankless units are more energy-efficient, their combustion process produces carbon emissions. However, some condensing gas models are designed to capture and reuse heat, thereby reducing emissions.

When you’re looking to install a tankless water heater, it’s important to evaluate all the key differences we’ve highlighted above to make an informed choice. You can consult with a plumbing service that specializes in tankless water heater installation and water heater repair. A plumbing service can help you choose a water heater that aligns with your specific hot water needs, budget, and the infrastructure of your home.

The Pros And Cons Of Electric Tankless Water Heaters

Pros

  • Lower upfront cost
  • Simplified installation
  • No combustion emissions
  • Quiet operation
  • Efficient for low-flow applications
  • Suitable for areas without natural gas

Cons

  • Dependent on electrical supply
  • Lack of efficiency at high demand
  • Limited hot water capacity
  • Higher operating costs

The Pros And Cons of Gas Tankless Water Heaters

Pros

  • High hot water capacity
  • Energy efficiency
  • Lower operating costs
  • Long lifespan

Cons

  • Higher initial cost
  • Complex installation
  • Produce carbon emissions
  • Require more installation space

Professional Water Heater Services

If you’re looking for an experienced plumbing company that offers high-quality water heater services, reach out to Mr. Rooter Plumbing. Whether you’re in need of new water heater installation or water heater repair, our skilled and experienced plumbers have what it takes to provide you with top-notch services.

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