How Much Does a Water Heater Cost?
Updated September 2026
A water heater replacement costs $900–$3,000 installed, with an average around $1,400. The type you choose moves the number more than anything else: a like-for-like tank swap sits at the low end, tankless starts around $2,500, and a tank-to-tankless conversion can reach $6,698. Every figure below comes from our cited dataset — sources listed at the end.
Water heater installation cost
Installation is most of what you pay for. The dataset's installed unit definition includes the equipment, labor, standard reconnection of venting and lines, haul-away of the old unit, and — for like-for-like gas swaps — the permit. Labor alone runs $900–$1,500 for gas tankless-class installs and $500–$1,000 for electric, per Fixr's labor tables.
Across all fuel and type combinations, most homeowners land between $900 and $3,000; HomeAdvisor's most-common band is $882-$1,826 (most homeowners), inside that envelope.
| Type | Installed cost (low–typical–high) |
|---|---|
| Electric tank (any size) | $600–$1,500–$3,500 |
| Gas tank (any size) | $1,000–$1,850–$2,700 |
| Heat pump / hybrid (50–80 gal) | $1,600–$3,200–$5,500 |
| Gas tankless (whole house) | $2,500–$2,811–$4,500 |
| Electric tankless (whole house) | $1,000–$2,000–$3,000 |
50-gallon water heater cost
The 50-gallon tank is the most common replacement. Installed, a 50-gallon gas unit runs $900–$2,500 (about $1,800 typical), including venting reconnect, haul-away, and permit. HomeAdvisor shows a lower $800 installed low for the same job. Electric shows the same shape cheaper: $700–$1,900 ($1,300 typical) — Fixr (HomeAdvisor's 50-gal band runs wider at the top). The dataset's gas band covers 40–50 gallons, so a 40-gallon swap prices inside the same envelope.
40-gallon water heater cost
Forty-gallon units price inside the same published band as 50-gallon units — $900–$2,500 installed for gas, $700–$1,900 for electric — because the dataset bands 40-50 gallons together and guides quote them as one class. The practical difference between 40 and 50 gallons is sizing, not price: roughly 1–4 people on 40 gallons, 3–5 on 50. Stepping up to the 75–80 gallon class is where cost actually moves: $1,100–$3,500 installed — Fixr; HomeAdvisor runs the low end the same and a wider top end.
Gas vs. electric water heater cost
Across all sizes, a gas tank replacement runs $1,000–$2,700 installed ($1,850 typical), while an electric tank runs $600–$3,500 ($1,500 typical). Electric is cheaper to install — no venting, no gas-line work — but its band has a higher top end because it can include 240V circuit or panel work. Gas installs carry vent-type risk: atmospheric chimney venting is the baseline, while power-vent and direct-vent units add cost. Fuel choice is usually dictated by what the house already has; switching fuel is a conversion, and conversions price like one.
Tankless water heater cost
A whole-house gas tankless unit runs $2,500–$4,500 installed (Fixr's national average: $2,811), with the full envelope from $1,058 for simple swaps to $6,698 for conversions. The unit itself is $500–$2,000; the rest is labor and venting/gas-line work. Electric tankless is cheaper to install at $1,000–$3,000, but a panel upgrade ($1,500-$3,000 when a $100-150A service must be upgraded) is excluded from that band and common with whole-house models.
Converting from tank to tankless is its own category: $4,000–$6,698 installed, flagged in the dataset as an estimated, blended figure (the gas-line upsize alone runs gas line upsize: roughly $500 per Fixr tankless page (gas line 'is approximately $500'); other guides quote more for long runs, plus venting, an outlet, and possibly a condensate drain).
A heat-pump / hybrid water heater splits the difference: $1,600–$5,500 installed (the manufacturer guide bands $2,500-$5,000 (Rheem guide, citing The Home Depot)), with the unit at $1,500–$3,000 and operating savings up to ~$550/yr vs standard electric tank (ENERGY STAR, cited in Rheem guide); payback $3-7 years vs. a standard electric tank. It needs clearance — roughly 700-1,000 cubic feet of air volume or louvered doors — and a 240V circuit when converting from gas.
What drives the cost
- Fuel and type. Electric tank is cheapest to install; gas tank mid-pack; tankless and heat pump highest. fuel type (electric cheapest to install, then gas, then propane/oil)
- Venting. Atmospheric vs. power/direct vs. condensing side-wall venting is a core spread driver for gas units.
- Capacity. 40–50 gal is one price class; 75–80 gal starts at $1,100.
- Code upgrades at swap. Drip pan, seismic strapping, expansion tank, and TPR discharge piping (code-required upgrades (drip pan, seismic strapping, expansion tank, TPR discharge)).
- Permit and haul-away. Included in like-for-like replacement pricing; jurisdiction-dependent otherwise.
- Conversions. Gas-line upsize, vent routing, electrical availability — the difference between a $1,800 swap and a $4,500 conversion is about $2,700.
Frequently asked questions
How much does it cost to replace a water heater?
Most homeowners pay $900–$3,000 for an installed water heater replacement (HomeAdvisor's most-common band is $882-$1,826 (most homeowners); the Fixr average is about $1,400). Fuel and type move the number: an electric tank is the cheapest install, while a like-for-like 40–50 gallon gas swap runs $900–$2,500.
How much does a new water heater cost installed?
Installed — equipment plus labor, standard reconnects, and haul-away, with permit included for like-for-like gas swaps — a typical replacement runs $900–$3,000 (about $1,400 at the average). Tankless installed runs $2,500–$4,500 for gas, and converting from tank to tankless reaches $6,698 once gas-line and venting retrofit work is included.
Why do people say “hot water heater”?
It's technically redundant — the water entering the tank is cold, so a "hot water heater" would be a device that heats already-hot water. The appliance heats cold water, so the correct term is simply "water heater." The longer phrase is common in everyday speech and search, but plumbers and manufacturers say "water heater."
Is a tankless water heater worth it?
It depends on how long you stay and how much hot water you use. Installed cost is the hurdle: $2,500–$4,500 for gas (about $961 more than a gas tank at the typical point), and $4,500–$6,698 if converting from a tank. In return, tankless units last longer — ${gasTanklessProduct.specs.lifespan_years} versus ${gas50Product.specs.lifespan_years} for tanks — and never run out of hot water. The math works best for high-demand households and long-stay homes; for a short stay or a tight budget, a like-for-like tank swap is usually the better spend.
40 vs. 50 gallon water heater: is there a cost difference?
Barely — the dataset publishes 40 and 50 gallons as one band (${gas50Product.specs.capacity_gallons} gallons at $900–$2,500 installed for gas; $700–$1,900 for electric). At the same fuel, the installed premium for 50 over 40 gallons is small; household size is the right sizing lens — roughly 1–4 people for 40 gallons, 3–5 for 50.
How long does a water heater last?
Tank units last ${gas50Product.specs.lifespan_years} (gas) or $10-15 (Fixr 50-gal page); electric tanks quoted $6-10 in the 40-gal page lifespan note (electric); tankless runs ${gasTanklessProduct.specs.lifespan_years}; heat-pump hybrids ${heatPumpProduct.specs.lifespan_years}. Age is the main replacement trigger — once a tank is past its band, replacement usually beats repair.
Sources
- Fixr - How Much Does Water Heater Installation Cost in 2026? — manual, reliability: high
- Fixr - How Much Does a Gas Water Heater Cost in 2026? — manual, reliability: high
- Fixr - Tankless Water Heater Installation Cost — manual, reliability: high
- Fixr - Cost to Replace a 40-Gallon Water Heater in 2026 — manual, reliability: high
- Fixr - 50-Gallon Water Heater Installation Cost in 2026 — manual, reliability: high
- HomeAdvisor - How Much Does Water Heater Replacement Cost? — manual, reliability: high
- Rheem - Heat Pump Water Heater Cost Guide (manufacturer) — manual, reliability: high
Estimate only — get local written quotes. Figures are national installed ranges from public cost guides as of September 2026, not verified contractor pricing. The tank-to-tankless conversion band is derived (estimated, lower confidence), and heat-pump figures blend manufacturer and independent guides; both are flagged in our dataset. Related: the water heater cost hub and the water heater cost calculator — and for the exterior works that shed water toward your foundation, the driveway cost guide (asphalt, concrete, and paver pricing per square foot — the grading pairs with your drain-hose and pan routing).