Water Heater Replacement Cost: Tank vs Tankless

According to Angi cost data, homeowners in the US typically pay $600 to $1,800 installed for a standard storage-tank water heater and $1,500 to $3,500 for a tankless (on-demand) unit. Heat-pump hybrid models run $1,200 to $3,500 installed. Final cost depends on fuel type, capacity, venting requirements, and whether code-required upgrades are needed. The sections below break down each cost driver.

Water Heater Types and Their Installed Cost Ranges

The table below summarizes typical installed costs by type, based on Angi and HomeAdvisor cost data compiled from contractor invoices across US markets. Regional labor rates, brand selection, and permit fees will move your number up or down.

Ranges represent typical installed cost (unit + labor + basic materials) in most US markets. Costs do not include code-upgrade work such as new venting, gas line extension, or electrical panel upgrades, which can add $200 to $1,500 or more.

What Drives the Price: Capacity, Fuel, and Complexity

Capacity -- Gallons vs. GPM

Storage-tank water heaters are sized in gallons. A 40-gallon tank is standard for households of one to three people; a 50-gallon tank handles three to five people. Moving from a 40-gallon to a 50-gallon unit typically adds $50 to $150 to the unit price.

Tankless heaters are rated in gallons per minute (GPM). Most residential gas tankless units deliver 5 to 10 GPM. Undersizing a tankless heater for a home with simultaneous demand -- showers, dishwasher, washing machine -- is a common and expensive mistake. Your contractor should calculate peak simultaneous demand before recommending a unit size.

Fuel Type: Gas vs. Electric

Gas water heaters generally have lower operating costs because natural gas is less expensive per British thermal unit (BTU) than electricity in most US markets, according to the U.S. Energy Information Administration. Electric storage tanks have a lower purchase price but often cost more to run over time.

However, gas work comes with added installation costs. Connecting to an existing gas line is straightforward; running a new gas line or upgrading an undersized line can add $200 to $700 or more, according to Angi data. Electric tankless units frequently require upgrading the electrical panel or adding a dedicated 240-volt circuit, which can add $500 to $1,500 depending on panel capacity.

Installation Complexity and Code-Required Upgrades

A straight replacement -- same fuel type, same location, same capacity -- is the least expensive scenario. Switching fuel type or going from tank to tankless introduces complexity that raises the price considerably. Common code-required upgrades include:

• Expansion tank: Many jurisdictions now require a thermal expansion tank on closed water systems. This small addition runs $50 to $150 in parts and labor.
• Venting: Tankless gas heaters often need a new direct-vent or power-vent flue. Venting work can add $300 to $800 depending on run length and material.
• Gas line work: Upgrading line size for a high-BTU tankless unit typically adds $200 to $700.
• Electrical upgrades: Tankless electric units can require a 200-amp panel upgrade if your current panel is at capacity -- a $1,500 to $3,000 project on its own.
• Seismic strapping: Required in earthquake-prone states such as California; typically a small add-on cost of $25 to $75.

Labor Costs for Water Heater Installation

Labor for a standard storage-tank replacement by a licensed plumber typically runs $150 to $400 for a straightforward swap, according to Angi cost data. Tankless installations take longer and involve more complexity; labor alone can run $300 to $800 or more for gas tankless, or higher if venting or electrical work is included.

Factors that increase labor costs include:

• Difficult access (utility closets, attics, crawlspaces)
• Haul-away and disposal of the old unit (typically $50 to $100 extra)
• Weekend or emergency call-out rates (often 1.5x to 2x standard rates)
• Permit processing time that requires a second visit for inspection

Getting at least three written quotes from licensed, insured plumbers is the standard approach. Learn how to get accurate contractor quotes before you call anyone.

Lifespan and Energy Efficiency by Type

Lifespan

The U.S. Department of Energy estimates that conventional storage-tank water heaters typically last 10 to 15 years, with electric models often reaching the higher end of that range. Tankless water heaters tend to last 20 or more years with proper maintenance, including annual descaling in hard-water areas. Heat-pump (hybrid) units generally fall in the 10 to 15-year range, similar to storage tanks.

Lifespan matters for cost calculations. A tankless unit that costs $2,500 installed and lasts 20 years may cost less per year of service than a $900 tank that lasts 10 years -- before accounting for energy costs or the hassle of a second replacement.

Energy Efficiency and the Uniform Energy Factor (UEF)

Water heaters are rated by their Uniform Energy Factor (UEF), a standardized measure set by the U.S. Department of Energy. A higher UEF means less energy wasted. Conventional gas storage tanks typically carry a UEF of 0.58 to 0.70. Electric storage tanks run 0.90 to 0.95. Gas tankless units achieve UEFs of 0.87 to 0.96. Heat-pump water heaters lead the category at UEFs of 2.0 to 4.0, meaning they produce two to four units of heat energy for every unit of electrical energy consumed, according to ENERGY STAR data.

The DOE estimates that heat-pump water heaters can save a typical household $300 to $550 per year on water-heating costs compared to a standard electric resistance tank. Over a 10-year lifespan, that is $3,000 to $5,500 in potential savings -- enough to offset a significant portion of the higher upfront cost.

Federal Tax Credits and State Rebates

State-level incentives vary considerably. Some states offer sales-tax exemptions on qualifying energy-efficient water heaters; others offer cash rebates through utility programs. These rebates can range from $50 to $750 depending on the program and the unit's efficiency rating. Stack federal and state incentives carefully -- some programs require you to apply before installation, not after.

Repair vs. Replace: How to Decide

Water heater repair costs typically run $150 to $600 for common issues such as a failed heating element, a bad thermostat, or a faulty anode rod, according to HomeAdvisor cost data. Replacement makes more sense when:

• The unit is more than 10 years old (tank) or more than 15 years old (tankless)
• The tank shows visible rust or corrosion, especially around the base or on fittings
• You are seeing sediment or discolored water that flushing does not resolve
• The repair estimate exceeds half the cost of a replacement unit
• You are experiencing repeated failures within a short period

A leaking tank is almost always a replacement job, not a repair. Once a tank develops a structural crack or a corroded seam, patching is not a reliable fix.

For guidance on avoiding overpriced or unnecessary repair recommendations, see how to avoid home improvement scams -- the "repair upsell" is a documented pattern in the home-services industry.

How to Hire the Right Contractor

Water heater work crosses trade lines. A licensed plumber handles the water connections and venting; a licensed electrician handles panel and circuit work; a licensed gas fitter (in states that separate this license from plumbing) handles the gas line. In practice, many licensed plumbers hold all required credentials for a standard installation -- but confirm this before signing anything.

Minimum standards before you hire:

1. State plumbing license -- verify through your state's contractor licensing board, not just the contractor's word
2. General liability insurance -- request a certificate of insurance naming you as the additional insured
3. Workers' compensation coverage -- protects you if a worker is injured on your property
4. Written scope of work -- unit model, capacity, labor, permit fees, and haul-away all spelled out before any money changes hands

A contractor who resists pulling permits, asks for a large cash payment upfront, or cannot produce a license number on request is a red flag. Review how to get accurate contractor quotes and licensed vs unlicensed contractor risks before signing.