Water heater cost guides: replacement, repair and running costs

Typical price ranges

National ranges from cost guides, not quotes. Each row links to our full guide.

Job	Typical range	Source	Full guide
Tank replacement (40 to 50 gal)	$600 to $3,100 installed	HomeGuide 2026[1]	Water heater replacement cost
Full-scope 50 gal gas tank swap	$2,900 to $5,050 with expansion tank, pan and permit	ProjectCostPro 2026[6]	Water heater installation cost
Tankless install	$1,400 to $5,600	HomeGuide 2026[2]	Tankless water heater cost
Heat pump (hybrid) install	$2,000 to $4,600	HomeGuide 2026[1]	Heat pump water heater cost
Tank to tankless conversion	Unit and install, plus gas line $350 to $2,000 and new venting $100 to $600	HomeGuide 2026[2]	Tank to tankless conversion cost
Repair, tank	$150 to $700; average $455	HomeGuide 2025[3]	Water heater repair cost
Anode rod replacement	$150 to $350	HomeGuide 2025[3]	Anode rod replacement cost
Heating element replacement	$100 to $350	HomeGuide 2025[3]	Heating element replacement cost
Thermocouple / gas control valve	$100 to $325 / $150 to $550	HomeGuide 2025[3]	Thermocouple and gas valve replacement cost
Expansion tank	$100 to $400 added to an install; $300 to $800 to replace	HomeGuide 2026[1], 2025[3]	Expansion tank installation cost
Permits	$50 to $200 typical	HomeGuide 2026[2]	Water heater permit fees by city
Tankless descaling	$75 to $300	HomeGuide 2025[3]	Tankless descaling service cost
Emergency service	Call-out fees of $50 to $200 plus $45 to $150 an hour; after-hours costs more	HomeGuide 2025[3]	Emergency water heater service cost
Operating cost	Depends on fuel prices and efficiency	DOE[4][5]	Water heater operating cost by fuel

What drives an install price

Like-for-like or a change. Swapping a 50-gallon gas tank for another in the same spot reuses the gas line, vent and connections. Switching to tankless often means a larger gas line ($350 to $2,000) and new venting ($100 to $600), because an old tank vent cannot be reused^[2]. Electric upgrades may need a dedicated circuit ($250 to $900) or a new panel ($850 to $1,700)^[2].

Code items. Many installs need an expansion tank, a drain pan, a new relief valve discharge pipe or seismic straps to pass inspection. Quotes that leave these out look cheaper but are not comparable.

Access and timing. Attics, crawl spaces and tight closets add labor. Emergency and after-hours calls add fees^[3].

Running cost matters too

The purchase is a one-time cost; fuel is paid every month. DOE's Building America guide says a standard gas tank burns about 40 therms a year just keeping its water hot^[4]. DOE estimates that moving from an electric resistance tank to a heat pump unit meeting its 2029 standard saves about $1,800 over the unit's life^[5]. Your local gas and electric rates decide which fuel is cheaper to run.

Repair or replace?

Rheem's rule of thumb: if a repair costs more than 50% of a new unit, replacement is almost always the better investment^[8]. Age matters too. Tanks typically last 8 to 12 years^[8]. See repair or replace.

Tax credits in 2026

The federal 25C credit no longer applies. The IRS says it is not allowed for property placed in service after December 31, 2025^[7]. Utility and state rebates may still lower the price, especially for heat pump units.

When to call a pro

• Get at least two written quotes that list the unit, labor, code items, permit and haul-away separately.
• Ask a licensed plumber to confirm gas line, vent and electrical needs before you compare tankless or heat pump quotes.
• If a repair quote is near half the price of a new unit, ask for a replacement quote too.