How long does it take a plumber to install a tankless water heater?

Author: Dr. Werner Beer  |  Last update: Thursday, March 26, 2026

Installing a tankless water heater typically takes four to five hours, depending on the type of system and a household's needs. The installation process duration also depends on your location and which professionals are available when you need an installation.

Can a tankless water heater be installed in one day?

Your water heater will be installed cleanly, accurately and within one day. When it comes to what size tankless water heater your home requires, our installation experts will need to know the size of your home, how many people are in your home, how much hot water usage you have (number of full baths, half baths, etc.)

Do you need a plumber to install a tankless water heater?

So if you don't feel fully prepared with your plumbing and electrical skills, it's best to hire a licensed professional — in some locations, this is required. And make sure to follow local electrical and plumbing codes for installing and sourcing parts.

What is the downside of a tankless water heater?

Before you commit to buying a tankless water heater, the primary drawbacks to know include: Higher upfront costs. Tankless water heaters are, on average, quite a bit more expensive to buy and install than tank water heaters. Access to fuel.

Why do people not like tankless water heaters?

Additional Installation Costs

Tankless water heaters are much more complex than traditional hot water tanks. As a result, they require professional installation. If you're switching from a hot water tank to a tankless unit, you will likely need your gas lines rerouted, as well as a larger gas supply line.

3 Things They Don’t Tell You About Tankless

Can I replace my 40 gallon water heater with a tankless water heater?

Absolutely! In fact, tankless water heaters are becoming the standard for new home construction because of the energy efficiency.

Is there an IRS tax credit for a tankless water heater?

The federal tax credit for tankless water heaters in 2024 is an excellent opportunity for homeowners to save money while investing in energy-efficient water heating solutions. This tax credit is effective from January 1, 2023, to December 31, 2032.

Can a handyman install a tankless water heater?

“Water heater installers” can encompass a variety of professionals, but in most cases, a plumber or a handyman is the best choice for this project. One of the most important considerations is whether the professional has had experience completing similar installations.

How long do tankless water heaters last?

One of the most common questions asked by consumers about tankless water heaters is how long they will last. A tankless water heater can last anywhere from 15 to 20 years with proper maintenance and operation. In comparison, a standard tank water heater normally has a working life of 10 years or less.

Why is tankless water heater installation so expensive?

Installing a tankless water heater can require gas line upgrades, electrical modifications, and specialized venting—all of which can increase costs. Professional labor also runs from $500–$1,500 due to complex installation requirements.

How long does it take to install a tankless water heater?

In this case, you can expect an average installation time of about four to six hours. There is a chance that your technician will be able to get the tankless water heater installation done ahead of schedule.

Can you run 2 showers with a tankless water heater?

The right tankless water heater can definitely take care of all your family's hot water needs, including taking multiple showers at once. If you're considering upgrading to a tankless water heater, it's essential to work with experienced professionals.

How much money will I save by switching to a tankless water heater?

It's true: tankless water heaters will cut up to 40% off your monthly energy bill. By heating water instantaneously and only when you need it, you and your family members can enjoy continuous, uninterrupted hot water at the same time, along with savings over a conventional tank.

Can you run out of hot water with a tankless water heater?

Endless Supply of Hot Water

The tankless water heater is—you guessed it—tankless! Because there's no tank, it doesn't work off of capacity; it works off demand. A tankless water heater heats up water as you need it, and it brings hot water to your appliances quickly—and never runs out.

Does a plumber or electrician install a tankless water heater?

Installing a tankless water heater often involves professional plumbing and electrical work that is best done by a licensed professional.

How much can I charge to install a tankless water heater?

The typical range for tankless heater installation is between $5,400 and $7,400 averaging out to around $6,400 (including the water heater, warranty and tune ups). The tankless installation without the unit can cost between $1800 and $3500, averaging out to around $2650. One of the big variables is labor rates.

Who should install a tankless water heater?

Installation — Whether you're replacing a tankless system or upgrading from a tank-type water heater, you should leave the water heater installation to a professional who's certified to install tankless heaters.

What is the best tankless water heater?

7 Best Tankless Water Heaters for Large Homes in 2025
  • Best Overall: Rinnai RU199iN.
  • Best Premium: Navien NPE-240A.
  • Best Gas Option: Rheem RTGH-95DVLN.
  • Best Electric: Stiebel Eltron Tempra 36.
  • Best Value: EcoSmart ECO 36.
  • Best Compact: Takagi T-H3-DV-N.
  • Best Warranty: Noritz NR981-DVC-NG.

Can I write off a water heater on my taxes?

Water Heater Tax Credit Details.

You can claim 30% of the project cost, up to a $2,000 maximum credit. Heat pump water heaters that have earned the ENERGY STAR are eligible for this credit. You can find a list of ENERGY STAR certified models here.

What category appliance is a tankless water heater?

Tankless water heaters don't always fit into one category. Many of these appliances are Category IV, condensing with induced draft. Some fall into Category III, induced draft with higher temperature non-condensing flue gases.

What are the downsides of tankless water heaters?

Tankless water heaters have several drawbacks and disadvantages, including a higher initial cost, limited flow rate, specialized venting requirements, potential need for additional equipment, limited hot water supply, delayed hot water delivery, mineral buildup and maintenance, complexity of installation, dependence on ...

Does Costco sell tankless water heaters?

And to keep the hot water flowing, we offer a variety of high-performance water heaters, including electric water heaters, energy-saving tankless water heaters, and the latest smart water heaters. Costco carries a variety of lighting that's perfect for your kitchen, bathroom, dining room, and outdoor living areas.

Do you have to replumb your house for a tankless water heater?

Do I need to replace all my home's plumbing if I install a tankless water heater? Rarely is a complete overhaul necessary. However, you may need to upgrade certain sections of your plumbing, particularly those leading into and out of the tankless unit, to ensure proper water flow and volume.

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