Key Takeaways
- A licensed plumbing contractor handles water heater replacement, with total costs from $800 to $2,000.
- Gas water heater installation requires flue pipe venting and a gas line inspection. Electric water heater installation needs a dedicated 240-volt circuit.
- A 50-gallon gas water heater replacement typically runs $900 to $1,500.
- Failing pressure relief valves, corroded drain valves, and rusty supply lines are key signs a water heater needs replacing.
What Does a Plumbing Contractor Charge for Water Heater Replacement?
Water heater replacement is a licensed plumbing service. A plumbing contractor drains the tank and disconnects the cold-water inlet and hot-water outlet pipes. The plumber removes the old water heater and installs the new one with updated pipe fittings and a new temperature and pressure relief valve. The average water heater replacement cost in the U.S. is $800 to $2,000, covering the water heater unit and plumbing labor.
Water Heater Installation Cost by Type
Most homeowners pay $800 to $1,500 for a full water heater installation. Common water heater replacement costs:
- 50-gallon gas water heater replacement: $900 to $1,500
- 50-gallon electric water heater replacement: $700 to $1,300
- 55-gallon electric water heater installation: $850 to $1,600
- Tankless gas water heater installation: $1,500 to $3,500
- Tankless electric water heater installation: $1,000 to $3,000
Plumbing labor runs $150 to $500. Plumbing permit fees, expansion tank installation, and supply line upgrades add $50 to $500 more.
Plumbing Factors That Affect Water Heater Replacement Cost
Tank capacity: A plumbing contractor sizes the water heater based on the first-hour rating and recovery rate. Larger water heaters cost more.
Flue pipe and gas line: Gas water heater installation requires a flue pipe inspection and a gas line check. A corroded gas line fitting adds to plumbing labor costs.
Pipe fittings: Corroded fittings at the cold water inlet or hot water outlet require re-piping before water heater installation.
Plumbing permit: Most jurisdictions require a plumbing permit for water heater installation, adding $50 to $200. The plumbing contractor pulls the plumbing permit and schedules the plumbing inspection.
Pressure relief valve: Plumbing code requires a new temperature and pressure relief valve on every water heater installation. A discharge pipe routes to a drain.
Expansion tank: Closed plumbing systems need an expansion tank. A plumbing contractor confirms whether the local plumbing code requires one.
Tank vs Tankless Water Heater Plumbing Costs
Tank water heater installation connects the cold water inlet, hot water outlet, flue pipe or electrical supply, and pressure relief valve. A plumbing contractor completes a 50-gallon tank water heater installation for $800 to $1,500.
Tankless water heater installation requires re-piping supply lines and upsizing the gas line or circuit. Plumbing costs run $1,000 to $3,500. Tankless water heaters eliminate standby heat loss and qualify for Energy Star rebates.
Gas vs Electric Water Heater Plumbing and Venting Costs
Gas water heater installation needs a flue pipe connection and a gas line inspection. The plumbing contractor commissions the water heater after both checks pass. Gas water heaters cost $900 to $1,500 installed.
Electric water heater installation uses heating elements and needs no flue pipe. A dedicated 240-volt circuit powers the water heater. A 55-gallon electric water heater costs $850 to $1,600 installed, including plumbing labor for supply line connections.
Plumbing Warning Signs Your Water Heater Needs Replacement
- Rusty water at the hot water outlet or supply fixtures
- Leaks at the drain valve, pressure relief valve, or tank base
- No hot water or inconsistent water temperature
- Sediment buildup causing rumbling inside the water heater tank
- Rising utility bills with no change in hot water use
- The water heater is more than 10 years old
A plumbing inspection covers the anode rod, pressure relief valve, drain valve, and pipe connections. It confirms whether plumbing repair or full water heater replacement is needed.
What a Plumber Checks During a Water Heater Inspection
A licensed plumber inspects the full residential plumbing system before recommending water heater replacement. The plumber checks the cold water shutoff valve, hot water supply line, and drain line for corrosion or leaks. The plumber also tests the pressure relief valve discharge pipe and inspects pipe fittings at every water heater connection point.
If the plumber finds corroded water supply pipes or a faulty shutoff valve, those plumbing repairs are done first. A full plumbing inspection adds $75 to $150 to the water heater replacement cost. It prevents future plumbing failures at the supply line or drain connection.
Water Heater Repair vs Replacement: A Plumbing Contractor’s Guide
Plumbing repair covers a faulty thermostat, burned heating element, depleted anode rod, or leaking drain valve. Water heater repair makes sense for water heaters under 6 years old with repair costs under $300.
A plumbing contractor recommends water heater replacement when the tank shows corrosion. Replace when the pressure relief valve fails repeatedly. Replace when plumbing repair costs exceed half the price of a new water heater installation.
How Long Do Water Heaters Last With Proper Plumbing Maintenance?
Tank water heaters last 8 to 12 years. Tankless water heaters last 15 to 20 years with regular plumbing maintenance. A plumbing contractor extends the water heater lifespan by flushing sediment annually and inspecting the anode rod every 3 to 5 years.
Frequently Asked Questions About Water Heater Plumbing Costs
Is it cheaper to repair or replace a water heater?
Water heater repair is cheaper for water heaters under 6 years old, with repair costs under $300. If the anode rod is depleted or the drain valve leaks, water heater replacement costs less over time.
How long do water heaters last?
Tank water heaters last 8 to 12 years. Tankless water heaters last 15 to 20 years with regular water heater maintenance and anode rod checks.
Are tankless water heaters more expensive to install?
Yes. Tankless water heater installation costs $1,000 to $3,500 versus $700 to $1,500 for a tank water heater installation.
How long does water heater installation take?
A plumbing contractor completes most water heater installations in 2 to 4 hours. Jobs needing flue pipe venting or plumbing permit approval take longer.
Should I replace a water heater before it fails?
Yes. Planned water heater replacement lets a plumbing contractor pull the plumbing permit and schedule the plumbing inspection. It avoids emergency plumbing service fees and water damage from a burst tank or failed drain valve.
What is the average cost of a tankless water heater?
A tankless water heater unit costs $500 to $2,000. Full plumbing installation by a licensed plumbing contractor brings the total tankless water heater installation cost to $1,500 to $3,500.