Plumbing · Water Heaters

Tankless Water Heater Replacement Cost, Permits and Who Does the Work

Removing an existing tankless water heater and installing a new one, typically handled by a plumber.

Model reviewed August 2026

Typical cost

$4,200

National, standard scope

Range

$2,200 – $8,500

Low to high scope

Trade

Plumber

DIY difficulty 1/5

Permit

Usually required

Plan on a permit and inspection

Do I need a permit for tankless water heater replacement?

Usually yes

Tankless Water Heater work at this scope touches structure, life safety or a permitted trade in most jurisdictions, so a permit and inspection are normally required. Always confirm with the building department that has jurisdiction over your address.

Cost breakdown

Modeled national figures for a standard single-family job.

Low endSimple scope, easy access, no surprises	$2,200
TypicalWhat most homeowners pay	$4,200
High endLarge scope, upgrades or difficult conditions	$8,500
Job type	Project
Cost varies by location	Moderate

Variants

Distinct options within this job that buyers compare before committing.

GasElectricWhole-housePoint-of-use

Calculators for this job

Water Heater Cost Calculator Tankless Water Heater Cost Calculator

Related jobs

Related projects homeowners often plan together.

Replacement forTankless Water Heater Installation$2,200 – $8,500 Replacement forTankless Water Heater Maintenance$264 – $1,020 Replacement forTankless Water Heater Repair$484 – $1,870 Often combined withWater Heater Replacement$1,100 – $4,600 Often combined withWater Heater Repair$242 – $1,012 Often combined withWater Heater Installation$1,100 – $4,600 Often combined withWater Heater Maintenance$132 – $552 Often combined withRecirculation Pump Replacement$300 – $1,800 Often combined withWater Heater Expansion Tank Replacement$150 – $700

Also searched as

You may also hear this called:

replace tankless water heater · new tankless water heater · tankless water heater replacement cost · tankless water heater swap

Frequently asked questions

How much does tankless water heater replacement cost?

Most homeowners pay between $2,200 and $8,500, with $4,200 typical for a standard single-family job. Figures are modeled national estimates, not quotes.

Do I need a permit for tankless water heater work?

Yes — in most jurisdictions this job is permitted and inspected. Check your local building department before work starts.

Who does tankless water heater replacement?

A plumber handles this job. DIY difficulty is rated 1/5 (5 = very DIY friendly).

Does the price change much by location?

Yes. Across the states we price, the typical cost ranges from $3,780 to $5,500 — about a 46% spread — driven by labor rates, code requirements and permit fees.