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

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

If you’re considering a tankless water heater, you’re not alone. Tankless systems are becoming increasingly popular because they offer endless hot water, energy savings, and a smaller footprint. But one of the biggest questions homeowners ask is:
How much does it cost to install a tankless water heater?
The answer depends on several factors, including the type of unit, fuel source, installation complexity, and your home’s existing setup. In this guide, we break down the costs in a clear, step-by-step way so you can make an informed decision.

1. Average Cost to Install a Tankless Water HeaterQuick Answer The average cost to install a tankless water heater ranges from $1,500 to $3,500, depending on whether it’s electric or gas, and how complex the installation is.
Here’s a quick breakdown:
Type  Average Cost Range                                                                                  Electric tankless   $1,500 – $2,500
Gas tankless (natural gas)   $2,000 – $3,500
Propane tankless   $2,500 – $4,500

2. Tankless Water Heater Cost vs Traditional Tank Water HeaterA traditional tank water heater typically costs $700 to $1,500 to install. That means tankless systems can cost more upfront, but they often save money over time through improved efficiency.
Why the Higher Price?

• More complex installation
  
• Higher unit price
  
• Possible gas line upgrades
  
• Venting requirements
  
• Electrical upgrades (for electric models)
  

3. Factors That Affect Installation Cost1. Type of Tankless Water HeaterThere are two main types:

• Electric tankless water heaters
  
• Gas tankless water heaters (natural gas or propane)
  

Gas models typically cost more due to venting and gas line upgrades.

2. Size of the Unit (Flow Rate)Tankless heaters are sized by GPM (gallons per minute).
Typical sizes:

• 6–8 GPM – for 1–2 bathrooms
  
• 8–10 GPM – for 2–3 bathrooms
  
• 10+ GPM – for larger homes
  

Larger units cost more, but they’re essential for consistent hot water during peak use.

3. Gas Line and Venting RequirementsGas tankless units require proper venting and may need a gas line upgrade.
Common costs include:

• Venting installation: $300–$800
  
• Gas line upgrade: $500–$1,500
  

These costs can vary depending on how far the gas line needs to run.

4. Electrical Upgrades for Electric TanklessElectric tankless heaters often require heavy-duty electrical wiring.
Common upgrades:

• New circuit breakers
  
• Additional wiring
  
• Dedicated circuit
  

This can add $500–$1,500 to the installation cost.

5. Labor and Installation ComplexityLabor costs vary by region and the difficulty of installation.
Typical labor costs:

• $500–$1,500 for straightforward installs
  
• $1,500–$3,000+ for complex installs
  

Complex installations include:

• Replacing a tank water heater in a difficult location
  
• Adding new venting
  
• Running new gas lines or electrical wiring
  

4. Additional Costs You Should Expect1. Removal and Disposal of Old Water HeaterMany homeowners assume this is included, but it often adds:

• $50–$200 for removal and disposal
  

2. Water Line UpgradesIf your home has older plumbing, you may need new water lines.

• $100–$600 depending on the scope
  

3. Permits and InspectionsMost areas require permits for tankless installations.

• $50–$300 depending on local regulations
  

5. Long-Term Savings and ROITankless water heaters can save money in the long run due to improved efficiency.
Energy Savings:

• Tankless units can be up to 30% more efficient than traditional tanks.
  
• They reduce standby energy loss because they only heat water when needed.
  

Typical Payback Time:

• Many homeowners see payback in 5–10 years, depending on usage and energy rates.
  

6. Tankless Water Heater Lifespan and Maintenance CostsTankless water heaters typically last 20 years or more, compared to 10–15 years for tank heaters.
Maintenance Costs:

• Annual flush to remove mineral buildup: $100–$200
  
• Filter replacements as needed
  

Proper maintenance helps prevent reduced efficiency and costly repairs.

7. Is a Tankless Water Heater Worth It?A tankless water heater is worth it if:

• You want endless hot water
  
• You want to reduce energy bills
  
• You have space constraints
  
• You want a longer-lasting system
  

It may not be worth it if:

• Your home is small and hot water demand is low
  
• Installation costs are very high due to upgrades
  

8. DIY vs Professional InstallationTankless installation should always be done by a licensed professional, especially for gas models.
Why?

• Gas line work requires certification
  
• Venting must meet building codes
  
• Incorrect installation can be dangerous
  
• Improper wiring can cause electrical hazards
  

FAQ: Tankless Water Heater Installation CostHow much does a tankless water heater cost to install?The average installation cost ranges from $1,500 to $3,500, depending on the type and complexity.
Are tankless water heaters worth the cost?Yes, for many homeowners, because they provide endless hot water and lower energy bills over time.
How long does it take to install a tankless water heater?Most installations take 4–8 hours, but complex installs can take longer.
Do tankless water heaters need special venting?Gas tankless models require proper venting, which can add to installation cost.
What is the lifespan of a tankless water heater?Typically 20 years or more, with proper maintenance.