80-gallon water heaters are expensive due to three main factors: high-efficiency manufacturing requirements, material costs for handling large water volumes, and specialized installation.
Larger households with 5 or more people can need up to an 80-gallon tank, unless their overall usage is low.
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.
Traditional 80-gallon water heaters have been phased out due to strict federal energy efficiency regulations enacted by the Department of Energy (DOE). Standard electric models larger than 50-55 gallons are largely unavailable because they can no longer meet the required Energy Factor (EF) ratings.
Yes, 80-gallon water heaters are still manufactured, but their availability depends on the type of unit you need.
Water Heater Size
30-gallon tank: ~5–7 minutes of hot water. 40-gallon tank: ~8–10 minutes. 50-gallon tank: ~10–12 minutes. 80-gallon tank: ~15–20 minutes.
Yes. The initial cost of converting your tank water heater to a tankless is expensive. Tankless water heaters are 3x more expensive than your average tank water heater. However, the energy savings and supply of endless hot water can outweigh the cost for many.
An 80-gallon water heater typically lasts 8 to 12 years, though well-maintained electric models can sometimes reach 15 years. Because of the heavier continuous strain on 80-gallon storage tanks, their lifespans are often on par with standard tanks rather than lasting as long as smaller or tankless options.
For the most durable water heater, Bradford White and professional-grade A.O. Smith (or its sister brand, State) are top choices because of their heavy-duty construction and contractor-only availability. For electric setups, the Rheem Marathon is highly regarded because its proprietary blow-molded plastic tank means it will never rust.
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.
Traditional tank water heaters last 8 to 12 years, while tankless models typically last 15 to 20 years. Lifespans vary greatly depending on water quality, unit design, and whether you perform regular maintenance like flushing the tank and checking the anode rod.
The average 80-gallon gas tank heats up in 60 to 70 minutes, while an electric tank the same size takes closer to 2 hours. This is assuming the temperature enters the tank at 62°F. If it's colder upon intake, it will take longer to heat up.
We recommend going with Rheem, specifically for the Professional Series with 8 Year Warranty.
If a standard showerhead is fitted, it will use around an extra half a gallon each minute, accounting for a 25-gallon emittance every 10 minutes, or 50 gallons throughout a 20-minute shower. *1 gallon = 4.54 litres.
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).
This problem usually comes down to capacity, heat production, or mixing issues inside your plumbing system. Sometimes the fix is simple, like adjusting your water heater temperature or flushing out sediment. Other times you may need a new mixing valve, an element replacement, or a different size water heater.
Most manufacturers and plumbing experts recommend flushing your water heater once a year to prevent sediment and mineral buildup, which helps maintain energy efficiency and extends the lifespan of the tank.
Yes, 80-gallon water heaters are still manufactured, but their availability depends on the type of unit you need.
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.
A 10-minute shower typically uses 12 to 25 gallons (45 to 95 liters) of hot water. The exact amount depends on your showerhead's flow rate and the temperature you prefer (as hot water is mixed with cold):
Here is a simple way to decide: Choose Navien if you want the highest efficiency, longest warranty, and built-in recirculation. Choose Rinnai if you have a large household and need the highest flow rates. Choose Rheem if you want a reliable brand at a lower price point.
In summary, an 80-gallon water heater is likely a good fit if you have a large household (5+ people), multiple bathrooms, frequent simultaneous hot water use, or high-demand fixtures. However, if your household is smaller and your peak demand is lower, a smaller tank is the more energy-efficient and cost-effective.
Natural gas is usually the cheapest way. Even with higher gas prices, a heating system fueled by natural gas is typically less than electricity, propane, or heating oil. Energy efficiency is another way to assess the cost of a heating system. An energy-efficient heating system saves you money on your heating bill.