The labor cost to install a 40-gallon hot water heater typically ranges from $300 to $1,000, with most standard replacements costing between $400 and $700. This generally includes removing and disposing of the old unit, installing the new heater, and making basic plumbing connections.
Naturally, tanks that heat more gallons of water typically have a higher price point, so the larger the tank size, the more you can expect to pay. For example, the average 40-gallon water heater installation cost runs between $1,000 and $2,500, while its 80-gallon counterpart runs between $2,650 and $3,910.
Professional installation costs to replace a water heater
The more hours of electrical, carpentry and plumbing work that are required for your installation (for example, installing new electric, water or gas lines or drywall), the higher your total water heater replacement cost.
The "best" water heater depends on your preferred fuel type and whether you want a traditional tank or a tankless system. Master plumbers and consumer experts consistently rank Rheem, A. O. Smith, and Bradford White as top overall brands.
Based on the manufacturer's suggested service life, the average life expectancy of a water heater is about 8 to 12 years. That varies with the location and design of the unit, quality of installation, maintenance schedule and water quality.
The Home Depot offers traditional water heater tanks and modern tankless units, both powered by either gas or electricity. Depending on your selection, the average cost for standard tank installation is generally between $1,600 to $2,400. Tankless installation can range from $2,400 to $5,400.
The longest-lasting water heater brands are Bradford White and Rheem (specifically the Marathon series). Bradford White is favored by plumbers for professional installations and longevity, while the Rheem Marathon uses a unique fiberglass tank backed by a true lifetime warranty.
There isn't a single "number 1" model, as the ideal water heater depends on your home's setup, but top-rated brands dominating the market include Rheem (best overall tank/tankless) and A.O. Smith (best for durability and commercial-grade units).
Both Rheem and Bradford White are top-tier water heater brands, but they cater to different buyers.
Beginning in 2023, the expanded version of 25C, now called the Energy Efficient Home Improvement Tax Credit (under the Inflation Reduction Act of 2022), will provide up to $2,000 in tax credits for qualified high efficiency water heaters as well as credits for electrical upgrades.
PMRs for malignancies of the stomach, kidney, brain, and lymphopoietic system were also elevated, especially among plumbers. Chronic rheumatic heart disease, emphysema, liver cirrhosis, and all external causes of death were the major non-cancer causes with significantly elevated PMRs.
In plumbing, the "135-degree rule" is a code standard that dictates how much a horizontal drain pipe can bend or change direction. It limits the total cumulative angle of pipe fittings before a system requires an access point (cleanout) or must be vented, ensuring proper flow and preventing chronic clogs.
A trustworthy plumber explains the problem and gives a clear estimate before starting work. If a plumber avoids giving prices, changes the cost later without reason, or refuses to provide a written estimate, this is a red flag. Sudden price increases after the job starts often mean you are being overcharged.
Installing a 40-gallon gas water heater from Lowe's typically costs $1,100 to $2,000 total, including the unit, labor, and materials. The physical heater costs between $450 and $800, while professional labor, permits, and connecting pipes add another $650 to $1,200.
A 40-gallon electric water heater typically uses 10 to 14 kilowatt-hours (kWh) of electricity per day, which translates to about 300 to 420 kWh per month. In terms of runtime, the heating elements operate for roughly 3 to 4 hours daily.
Installing a 40-gallon hot water heater typically takes 2 to 4 hours for a professional plumber to complete a standard, like-for-like replacement. This process includes draining the old tank, disconnecting lines, installing the new unit, and testing it. Complex installations, such as those requiring code upgrades, may take up to 6 hours.
We recommend going with Rheem, specifically for the Professional Series with 8 Year Warranty.
There are several reasons why your Rheem water heater may stop producing hot water, including a malfunctioning thermostat, sediment buildup, or issues with the heating elements. If you're not getting hot water, it's advisable to consult with a plumbing expert who can diagnose and fix the problem effectively.
Most Common Bradford White Water Heater Repair Problems
Top 10 Water Heater Brands of 2026
The longest-lasting water heater brands are Bradford White and Rheem (specifically the Marathon series). Bradford White is favored by plumbers for professional installations and longevity, while the Rheem Marathon uses a unique fiberglass tank backed by a true lifetime warranty.
A standard tank water heater should generally be replaced every 8 to 12 years, while tankless models typically last 15 to 20 years. You should consider upgrading if your tank is over 10 years old, or if you notice rust, leaks, or frequent breakdowns.
A lifetime warranty water heater is a premium unit—such as the non-metallic Rheem Marathon Electric Water Heater—that protects the tank against leaks for as long as you own your home.
Rheem 40-gallon electric water heaters generally receive positive reviews for their easy setup, quiet operation, and reliable hot water delivery for 2 to 4-person households. While standard resistance models are highly affordable, premium hybrid and smart versions stand out for drastically lowering long-term energy costs and offering advanced damage-prevention features.
Excessive Water Pressure: High pressure stresses your system and shortens its lifespan. A pressure-reducing valve can help. Undersized System: A unit that's too small for your household's demand works harder and wears out faster. Proper sizing during installation is critical.