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WaterHeaterCalc

Electric Storage Tank

Best Electric Water Heaters

Researched from the DOE test procedures, NFPA 54 and NEC code tables, and manufacturer specifications. Updated .

Quick answer

A plain electric resistance tank, like the 50 gallon Rheem PROE50, is still the most common water heater size in the country and is frequently bought at a big box store with installation bundled into the price. The parts around it, the anode rod, the vacuum relief valve, the timer, are where ordering online genuinely beats a same-day retail purchase.

An electric resistance tank is the plainest water heater there is: an insulated steel tank, one or two elements, a thermostat, and an anode rod to slow corrosion. It is also the category most often bought at a big box store with delivery and installation bundled into a single price, and there is no dishonesty in saying that route is frequently the better one for the tank itself, especially when the old unit needs to come out the same day.

Where ordering online genuinely wins is the layer around the tank: an anode rod bought for thirty dollars instead of paying for a "long warranty" model that mostly means a thicker factory anode, a vacuum relief valve for a bottom fed installation, a timer that shifts the elements off peak electricity hours. This page ranks the tanks honestly and spends real attention on that accessory layer.

Is a plain electric tank actually worth ordering online?

For the tank itself, often the honest answer is that a big box store with same-day installation is the better route, particularly when an old tank has already failed and the household cannot wait for shipping. Installation cost and labor rates are outside what this site covers; houseprojectcalc.com is the better source for what a professional installation actually runs.

What does make sense to order online is everything downstream of the tank: the anode rod that a "long warranty" model is really selling, a vacuum relief valve for a bottom fed or elevated installation, and a timer or smart controller that shifts element run time off peak electricity hours. None of those require same-day delivery, and the selection online is far deeper than a retail aisle.

How does a resistance element's wattage translate into breaker size?

NEC 422.13 treats a storage water heater of 120 gallons or less as a continuous load, which means the branch circuit is sized at 125 percent of the nameplate current rather than at the raw draw alone. That 125 percent margin, not the sticker wattage, is what an electrician actually uses to size the breaker.

Element wattage against the continuous-load amperage used to size the breaker
Element wattageAmps at 240V125% continuous-load ampsTypical breaker
4,500 W18.7523.430A
5,500 W22.928.630A

Published standard Source: Amps calculated from watts ÷ volts (P = I × V). NEC 422.13 treats a storage water heater of 120 gallons or less as a continuous load, sized at 125 percent of nameplate current; NEC 240.4(D) limits a 10 AWG copper conductor to 30 amps.. A licensed electrician confirms the actual breaker and wire gauge for a specific installation. Both wattages above land on a 30A breaker in practice because 240.4(D) caps the common 10 AWG conductor at that size regardless of the exact continuous-load math.

What accessories actually belong on an order for an electric tank?

Three items come up often enough on a resistance tank to be worth ordering deliberately rather than accepting whatever a big box installer includes.

How we chose these electric water heaters

We did not install any of these tanks ourselves. The picks come from manufacturer published specifications, warranty terms, and the pattern of verified owner reviews for reliability and fit, compiled rather than tested in person. Warranty length is treated here as a proxy for anode thickness, a documented industry pattern, rather than as a claim about the steel tank underneath being fundamentally different.

Buying tips for an electric storage tank

Size by household headcount and peak simultaneous use with the water heater size calculator before choosing a gallon count, and confirm breaker and wire sizing with the breaker size calculator against the element wattage actually installed. See the element wattage chart and the element replacement guide before assuming a no-hot-water problem means a whole new tank.

Turn the breaker off before touching an element or its wiring, and never energize an element that is not fully submerged. A dry-fired element can be destroyed in seconds, and working on a live circuit is a different order of risk entirely.

The picks, by tier

Beginner picks fit a specific constraint, household size, a lowboy slot, a warranty question, more than they compete on features. Intermediate is the straightforward, most common replacement. Expert is for a plumbing supply channel and a longer ownership horizon.

Beginner
GE 30 Gallon Electric
GE

GE 30 Gallon Electric

$576.00

Thirty gallons suits one or two people or an apartment. Buying smaller than the household needs is the single most common and most annoying sizing mistake in this category.

Best for: One or two people, or an apartment

Check price on Amazon

Frequently asked questions

What size breaker does a 4,500 watt electric water heater need?
A 4,500 watt element at 240 volts draws about 18.75 amps. NEC 422.13 treats a storage water heater as a continuous load, sized at 125 percent of that draw, which comes to about 23.4 amps, and NEC 240.4(D) limits the common 10 AWG conductor to 30 amps regardless, so 30A is the typical answer. A licensed electrician confirms the actual breaker for a specific installation.
Is it worth buying a plain electric tank online instead of at a big box store?
For the tank itself, often not, since a big box store bundling same-day delivery and installation is genuinely convenient when an old unit has failed. The parts around the tank, the anode rod, the vacuum relief valve, a timer, are where ordering online usually wins on selection and price. Installation labor cost is outside this site's scope; houseprojectcalc.com covers that question.
Does a longer warranty on a GE electric tank mean a better tank?
Usually it signals a thicker factory anode rod rather than a fundamentally different steel tank underneath, since the anode is what fails first and drives most warranty claims. A thirty dollar aftermarket anode rod, replaced proactively, can extend a shorter-warranty tank's working life without paying the premium for the longer-warranty model outright.
What does an anode rod actually do?
It sacrifices itself to galvanic corrosion instead of the steel tank, which is why an electric water heater with a depleted anode starts rusting from the inside out. Magnesium anodes are common and effective in most water; a flexible segmented rod is the only style that fits into a tank with less than about four feet of clearance above it in a typical closet.
Why would an electric tank need a vacuum relief valve?
A bottom fed tank or one installed above the main supply line can siphon partially empty if the supply pressure drops, which exposes the upper heating element to air. An energized element that is not submerged in water can dry-fire and be destroyed within seconds, and a vacuum relief valve is what prevents that siphoning from happening in the first place.
Can a timer reduce the electric bill from a resistance water heater?
Yes, where the utility charges different rates by time of day. A timer or smart controller that shifts most element run time to off peak hours does not change how many kilowatt-hours the tank uses, but it can meaningfully change what those kilowatt-hours cost. Compare the numbers with the water heater operating cost calculator before assuming the savings are worth the purchase.

Turn the breaker off before touching an element, and never energize one that is not submerged. That single habit prevents both a destroyed element and a genuine shock hazard, and it costs nothing to follow.