How Much Does a Tankless Water Heater Cost? [2025 Data]
A tankless water heater costs $2,627 on average. Depending on size, fuel type, quantity, and on-site issues, you could spend between $1,398 and $3,893.
You can choose between a single-point heater or a whole-house tankless heater, depending on your layout.
An average home needs 5.5 to 7.5 GPM to supply enough hot water at one time.
Electric heaters are a bit cheaper than gas or solar ones, but less efficient.
You can snag some decent tax credits if you install an Energy Star-certified tankless water heater.
Depending on the project, you may need to hire additional contractors like an electrician or plumber.
If you’ve ever experienced a shower without hot water, you know how unpleasant it can feel to hop into an ice-cold shower. To combat this experience, many homeowners invest in tankless water heaters. Tankless water heaters cost $2,627 on average, which can seem costly up front, but the energy savings and convenience make them well worth the price. Keep reading to learn more about what makes this type of water heater a great investment for your home.
We highly recommend inspecting your water heater annually for signs of degradation. If you spot any potential warning signs, consider contacting a local plumber.
Tankless Water Heater Cost Factors
A tankless water heater costs $2,627 on average. It can range anywhere from $1,398 to $3,893, with smaller electric tankless water heaters costing as low as $375. Several factors impact the final price you pay, such as the water heater's brand, type, and quality.
Single-Point Tankless Water Heater vs. Whole-House System
You can choose between single-point and whole-house tankless water heater systems. Some homeowners mix and match, installing a whole-house unit to handle the primary heating duties and placing a single-point system in an additional bathroom. This allows multiple people to shower at once.
| Single-Point | Whole-House System |
|---|---|
| Costs $100–$300 | Costs $450–$1,500 |
| Provides hot water to a single faucet or shower | Provides hot water to the whole house |
| Water travels short distances for efficiency | Water travels throughout the home |
| Heats 0.5–2 gallons of water per minute | Heats 5–10 gallons of water per minute |
Energy Type
Different energy types of tankless water heaters cost anywhere from $450 to $4,000. The type of tankless water heater you purchase affects the cost, with electric heaters being the most affordable, followed by gas and solar.
Quantity
If you're purchasing a single-point tankless water heater, these often range from $100 to $300 each. However, you might end up buying multiple heaters to accommodate different rooms, increasing your project cost.
Quality
For a high-quality tankless water heater, expect to pay around $1,000 to $3,000 more than a lower-quality tankless water heater. Lower prices often mean lower quality and longevity; if you plan to rely on the heater for everyday use, spending a bit more on higher-quality products is a good idea. Plus, a high-quality tankless water heater can last up to 20 years.
Brand
There are many brands to choose from when purchasing a tankless water heater. Some of them are more budget-friendly, while others are more expensive. Still, it’s wise not to let the cost of a tankless water heater be the sole determining factor: A mid-priced unit from a reputable brand might cost more upfront, but it will likely last longer than the lowest-priced option from a lesser-known brand.
Here are some of the reputable tankless water heater brands:
EcoSmart®
Rheem®
Eemax®
Rinnai®
Stiebel Eltron
Gallon per Minute (GPM)
Before choosing a tankless water heater, it’s important to evaluate the GPM flow required for your home. A tankless water heater works by heating water on demand, so it should be fast enough to simultaneously heat as many appliances and faucets as needed. An average home needs 5.5 to 7.5 GPM to supply enough hot water at one time.
Condensing vs. Non-Condensing
Condensing tankless water heaters use a second heat exchanger to transfer more heat to the water, reducing the temperature of the exhaust gases to the point of condensation and increasing the flow rate. Condensing units tend to cost more than non-condensing units, but they also operate more efficiently.
Tax Credits
Tax credits may be available for purchasing an ENERGY STAR-certified tankless water heater. The government also offers additional tax credits for solar-powered units.
Materials
Materials to install a tankless water heater will cost about $130 to $280, plus about $10 per linear foot for piping and pipe insulation. You’ll spend about $200 to $2,000 for the water heater unit itself.
Some material costs based on your water heater components include the following:
| Component | Cost |
|---|---|
| Gas connector kit | $20–$40 |
| Termination vent kit | $40–$100 |
| Hardware and fittings | $10–$30 |
| Two-piece brass valve set | $60–$110 |
| Piping and insulation | $10 per linear foot |
Location
We've broken down the cost to add a tankless water heater to your home by state below:
Tankless Water Heater Cost by Size
A primary cost factor is the size of the water heater. Larger heaters service a higher volume of water than smaller heaters, so count on increased costs. The amount of energy the heater can handle is one indicator of size. For tankless gas water heaters, the amount of energy they can handle is measured in the British thermal unit (BTU); electric water heaters use kilowatts (kW).
Here's what you can expect to spend on your new tankless water heater by size:
| Tankless Water Heater Size (Gallons per Minute) | Average Cost |
|---|---|
| 1 – 2 | $150 – $250 |
| 2 – 3 | $200 – $600 |
| 3 – 4 | $300 – $700 |
| 5 – 6 | $400 – $1,200 |
| 7 – 8 | $500 – $1,500 |
| 8+ | $600 – $2,000 |
Gas Water Heaters
Smaller water heaters of 120–140 BTUs cost $500 to $1,200, which is enough for a one- or two-bedroom home. Larger water heaters of 180–200 BTUs or more cost $900 to $2,200, and these appliances handle enough volume to service a home of five or more people. Gas water heaters have an average flow rate of up to 5 gallons per minute (GPM).
Electric Water Heaters
Smaller water heaters of 5–8 kWs cost $100 to $250, though this is just enough for a one-bedroom apartment or small home. Keep in mind that electric water heaters only have a flow rate of up to 2 GPM.
Mid-sized electric water heaters of 10–24 kWs cost $210 to $630 and can efficiently service a two-bedroom home. Large heaters of 27–36 kWs cost $420 to $800 and can handle enough volume for an expansive home.
Solar
Installing a tankless solar water heater costs between $1,800 and $5,700 on average. Although solar models are more expensive to purchase and install, they are ideal for very sunny areas and can lead to significant energy savings over time. Since they use the sun's energy to heat water, they are ideal for very sunny areas.
You can measure solar water heaters’ performance by solar fractions, which is the portion of the total conventional hot water heating load. High solar fractions indicate a greater solar contribution to water heating, lessening the energy required by the backup energy source. Average solar fractions for solar tankless water heaters range from 0.5 to 0.75.
How to Determine Which Size Tankless Water Heater You Need
Before choosing a tankless water heater, you should ensure it has the proper flow rate to accommodate the appliances in your home. A tankless water heater works by heating water on demand, so it should be fast enough to simultaneously heat as many appliances and faucets as you might need. An average home needs 5.5 to 7.5 GPM to supply enough hot water at one time.
To determine what size of tankless water heater you’ll need, add up the total GPM output for all the appliances you think you might need to run simultaneously. Here are some basic appliance outputs to reference when calculating the GPM capacity necessary for your home:
Conventional shower head: 4–6 GPM
Eco-friendly shower head: 2–3 GPM
Faucet: 1–2 GPM
Washing machine: 2–2.5 GPM
Dishwasher: 1.5–2 GPM
Cost to Install a Tankless Water Heater by Fuel Type
Wondering how much you can save (or spend) on a tankless water heater? One of the best ways to calculate your expenses is by the type of hot water heater you choose.
These are the average costs of the four types of tankless heaters:
| Tankless Water Heater Fuel Type | Average Cost |
|---|---|
| Electricity | $450 – $1,500 |
| Natural Gas | $1,000 – $1,500 |
| Propane | $1,000 – $1,500 |
| Solar | $1,800 – $6,000 |
Electric Tankless Water Heaters
As the most affordable option, installing an electric model tends to fall between $800 and $1,500. Note that you won’t have to spend on ventilation systems or related maintenance.
Natural Gas Tankless Water Heaters
Tankless natural gas water heaters cost between $1,000 and $1,500 to install, plus the additional cost of approximately $200 a year to run the gas. These have a better flow rate than electric heaters and are a little more expensive.
Propane Tankless Water Heaters
Though propane water heaters cost the same as natural gas ones at $1,000 to $1,500 for an installation, the fuel itself can add up, with propane costing approximately $350 per year to run.
Solar Tankless Water Heaters
As the costliest option, solar heaters range from $1,700 to $6,000, though some can be more than $13,000. Keep in mind that you have a higher return for solar heaters, with a 30% tax credit and a 50% to 80% decrease in your expenses for heating water.
Tankless Water Heater Installation Cost
When working out tankless water heater costs, factor in hidden costs for equipment, installation, and use. For example, equipment costs can increase if you need accessories to connect the tankless water heater to your pipes. Labor, permits, and power source conversion all impact the final tally.
First-time installations cost more than water heater replacement prices, as these will require additional electrical work and piping installation. Also, if you’re moving the water heater to a whole new location in your home, this will also drive up installation costs.
Labor Costs
All told, labor costs to install a tankless system average $600 to $1,850. In other words, the work takes around three hours to complete, though it may be more in special circumstances, such as old pipes that require cleaning or replacement.
You’ll need to hire a plumber, water heater installer, or HVAC contractor to install a tankless water heater. Plumbers charge $45 to $200 per hour, depending on demand, job complexity, experience level, and other factors. Labor boils down to around half the project, with materials and components making up the other half.
Permits
In some parts of the country, work permits and post-job inspections are required to update a home’s water heating system. Work permits for this type of job are easily obtained by your plumber or by heading to a local regulatory agency, costing $50 to $100, depending on where you live. In many cases, acquiring the permit also pays for an inspector to come out to take a look at the finished project. Check with your state or county to check water heater installation code requirements and if you need a permit to install a tankless water heater.
Accessibility
If the desired location of the new tankless system is difficult to access or narrow and harder to work in, this can raise the labor costs to up to 10% to 15% of your project total. Prices will vary based on the home and setup.
Pressure Regulator Replacement
If your home’s water pressure is not powerful enough to handle a tankless heater, replacing the pressure regulator is a common fix. Professional plumbers replace a pressure regulator, clear clogged pipes, or install a larger pressure tank (if you're on a well) if your house pressure is low.
Replacing a pressure regulator costs $250 to $350, but it pays for itself by lowering your home’s PSI. This, in turn, reduces energy bills and boosts the longevity of pipes, fixtures, and appliances.
Converting the Power Source
In some cases, tankless electric water heaters require an upgrade in electrical service to accommodate the new system. Hiring an electrician to perform this work costs $50 to $100 per hour, or around $100 to $200 for emergency services, and takes up to 2 hours. This means you’ll spend up to $200 to $400 to convert the power source.
Additionally, some homeowners opt for an entirely different fuel source for a new tankless system, like going from natural gas to electric. This requires an electrician for the conversion process, with the same pricing scheme as above.
Current Heating System Removal
Removing an existing hot water heating system can cost $500 or more, depending on the unit's size and accessibility, as well as the contractor's hourly rate. When looking for an installation quote, make sure the quote includes the removal and disposal of your current water heater.
Additional Tankless Water Heater Costs
There are additional cost factors and considerations when budgeting for a tankless water heater, including electrical work, insulation, gas line installation, home structure modifications, and more. Here’s a breakdown of how these additional costs will impact your budget.
Electrical Updates
If you’re installing an electric tankless water heater, you may need to budget extra for the cost to hire an electrician for electrical updates, which typically ranges from $50 to $100 per hour. You may need to upgrade some structures and electrical systems to meet the voltage requirements of your new water heater, requiring professional help.
Insulation
For some installations, plumbers and electricians may need to design new installations with additional materials, such as pipes and insulation, which typically cost $10 per foot. If you live in a colder climate, you should insulate your water pipes to help prevent them from freezing when temperatures dip.
Gas Line Installation
Installing a tankless gas water heater may require gas lines to be specially adapted to the water heater, which could add up to $1,000 to the cost of this project. If there is no available gas line for the water heater, you’ll need to install a gas pipe.
Home Structure Changes
Some homes may require structural modifications to accommodate a new tankless water heater. Older homes may require a permit to build a cabinet for a tankless heater. Check with your contractor to see if any additional building permits are needed for structural modifications.
Vent Types
Tankless gas water heaters need to be ventilated to the outside via a power vent or a direct vent. A power vent draws in air from the room holding the water heater and uses a fan or blower to expel the exhaust gases through a duct. A direct duct vent draws in outside air and exhausts it through another chamber or duct within that same duct. Small enclosed spaces are suitable for direct ventilation.
Utility Bills
Running your tankless heating system costs money, of course, so calculate utility costs to include prices for natural gas or electric power. Tankless units spend less energy than conventional systems, as you only use the heater when needed, but this is not a night-and-day difference. In other words, your utility bills should decrease by around 10% each month, depending on usage.
According to the Department of Energy, gas tankless water heaters can lower energy costs by $100 per year, and about $50 per year for electric tankless water heaters. Since you’re using less energy, you can expect to see a decrease in your monthly utility bills.
DIY vs. Hiring a Pro
While it’s possible to install a tankless water heater yourself, we don’t recommend it. You must have water heater installation experience to save money and safely DIY the installation. We strongly advise against attempting to complete this project yourself. Doing so could cause serious injury or damage to your property.
Tankless water heaters can explode or release carbon monoxide into the air if installed by an untrained handyperson. Many warranties are void if a pro doesn't install a system, and your home is at a higher risk of not being up to code if you ever choose to sell your property. In a nutshell, don’t try this at home! We recommend hiring a water heater professional near you.
Cost to Maintain a Tankless Water Heater
If your tankless water heater needs servicing, plumbers usually charge between $50 and $350 per visit for preventative maintenance on hot water heaters. For urgent maintenance issues, like a water heater that might explode, electrical hazards and water leaks, know who fixes tankless water heaters in your area to resolve the issue ASAP. You may need to hire an emergency plumber immediately. The cost to hire an emergency plumber typically ranges from $100 to $500 per hour.
Tankless water heaters may require occasional maintenance due to hard water and mineral buildup. You may be able to descale a tankless water heater yourself, but other maintenance work typically requires a licensed professional. It’s best to have your tankless water heater inspected by a plumber twice a year to prevent any problems. Keep in mind that tankless water heater repairs cost an average of $600 but can go up to as much as $1,300 for tankless water heaters in very poor condition.
Below are some of the most common tankless water heater maintenance services and their associated plumbing repair costs:
Fuse repair cost: $50 to $75
Gas valve replacement cost: $150 to $550
Heating element replacement cost: $200 to $300
Pilot light repair cost: $75 to $150
Pipe repair cost: $100 to $350
Pressure relief valve cost: $75 to $150
Thermostat repair cost: $75 to $150
Water heater flush cost: $110 to $200
Vent repair cost: $50 to $125
Ways to Save Money on a Tankless Water Heater
Installing a tankless water heater can be a big home improvement expense, but its efficiency and longevity will pay off in the long run. Still, if you want to avoid the sticker shock, there are ways to save money on tankless water heater costs.
Check for Rebates and Tax Incentives
ENERGY STAR-certified water heaters may be eligible for tax credits. Because of the Inflation Reduction Act, qualifying tankless water heaters can earn 30% of the project cost (usually up to $600). Some products may also qualify for rebates. You can check ENERGY STAR's energy-efficient products to see which financial incentives your specific water heater can earn.
Consider the Fuel Type
Keep in mind that the fuel type your water heater runs on can affect your installation and ongoing costs. Electric water heaters don’t require added ventilation and are one of the least expensive options. Natural gas and propane units have low to moderate up-front costs, but they’ll also require you to spend about $200 to $350 per year on fuel. While solar water heaters may cost the most to install, these tend to qualify for more tax incentives and can considerably cut down monthly utility costs, saving you money in the long run.
Buy the Right Size
While you don’t want to underestimate the size of the water heater you need, you also don’t want to go overboard and buy a water heater that exceeds your needed capacity. Choose the correct size for your space and household to avoid overpaying.
Buy Your Water Heater From a Store
Buying a water heater from a plumbing company can cost up to 30% more than buying a unit from a major retailer. Shop around for the best price, but be wary of deals that seem too good to be true.
Compare Warranties
Every manufacturer offers different warranties for tankless water heaters. Some offer a one-year limited warranty, while others offer a 25-year complete warranty that includes replacement parts, repairs, and labor.
High-end models with better warranties may cost more upfront, but the potential perks of having your tankless water heater covered when a problem occurs may save you more in the long run. Read the fine print when comparing wankless water heaters to help ensure you don’t incur costly repairs later down the road.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We’ve surveyed thousands of real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
Frequently Asked Questions
Yes. Since tankless water heaters only heat water where needed, they don’t produce the same standby energy loss as tank water heaters. According to the Department of Energy, for homes that use up to 41 gallons of hot water per day, tankless water heaters can be 24% to 34% more energy efficient than conventional tank water heaters.
At the same time, some homeowners may prefer a heat pump water heater, also called a hybrid water heater, which uses both tankless and conventional features for a very efficient method of heating water.
A tankless water heater can last around 20 years with proper maintenance. Repairs and replacement parts may also extend the life of the unit. Conventional tank water heaters typically only last between 8 and 12 years. However, a high-quality and well-maintained tank water heater can also last up to 20 years.
If you’re wondering if tankless water heaters are worth it, their ability to save on energy, take up minimal space, and last for much longer than most conventional water heaters makes the answer a resounding yes.
If you’re switching from a tank to a tankless water heater, it’s possible that the tankless water heater can lower your water pressure. That’s because tankless water heaters restrict water flow until it reaches a designated temperature. To avoid major issues with water pressure, be sure your new water heater has the GPM output necessary to heat every appliance needed.
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