Can I Install My Own Tankless Gas Water Heater

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Tankless Water Heaters: Installation, Costs, and Energy Efficiency

TL; DR
  • Typical installed cost for a gas tankless water heater is about $5,589, with pricing changing based on venting needs, install complexity, and gas line work.
  • Tankless units can cut energy waste because they heat water only when you use it, which can lower monthly bills over time.
  • DIY installation is possible but usually not recommended because it often requires gas line upgrades, proper venting, and condensation drainage.
  • Incorrect installation can create serious risks like gas leaks, flooding, or unsafe exhaust venting, so hiring a pro is safest.
  • Compared with electric models, gas tankless heaters are often favored for higher output, better performance in larger homes, and lower long-run operating costs.

How Much Does It Cost to Install a Gas Tankless Water Heater?

Installing a gas tankless water heater generally costs around $5,589, though prices can vary depending on installation complexities, venting requirements, and gas line modifications. Tankless heaters offer long-term savings, as they only heat water on demand, reducing energy waste.


Can You Install a Tankless Water Heater Yourself?

While it’s possible to install your own tankless water heater if you have the necessary skills and tools, it’s not recommended for most homeowners. Proper installation requires:


  • Gas line adjustments: Ensuring the gas line can supply enough fuel for the heater.
  • Venting: Installing proper venting systems to expel combustion gases.
  • Condensation management: Running a condensation line to prevent moisture buildup.


Without proper knowledge, DIY installation could lead to improper venting, potential flooding, or gas leaks. It’s always safest to hire a professional plumber.


How Long Can You Shower With A Tankless Water Heater?

With a tankless water heater, you can shower for as long as hot water demand stays within the system’s capacity. Because these units heat water on demand instead of storing it, they do not run out of hot water like traditional tank models. However, the length of your shower can still be affected by factors such as the heater’s flow rate, incoming water temperature, and whether other fixtures are using hot water at the same time. In most homes, a properly sized tankless system can easily support long, uninterrupted showers without noticeable temperature drops, making it a popular choice for households that want consistent hot water on demand.


Will a Tankless Water Heater Save You Money?

Tankless water heaters are more energy-efficient than traditional tank-style heaters. They heat water on demand, which means you won’t waste energy maintaining a tank of hot water. Many homeowners see a reduction in their gas bill after switching to a tankless system. Additionally, tankless water heaters often last 25 years or more, compared to the 6-10 year lifespan of traditional water heaters.


Is It Better To Have An Electric Or Gas Tankless Water Heater?

While both electric and gas tankless water heaters are viable options, gas models tend to be the better choice for most homeowners due to their:


  • Higher efficiency: Gas heaters can heat more water at once, making them better for larger households or high-demand situations.
  • Lower operational costs: Gas is often cheaper than electricity in the long run.


Electric models are still an option but tend to be more expensive to install and may struggle to meet higher hot water demands.

Matt Howard

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Can I Install My Own Tankless Gas Water Heater