What Does It Cost to Run an Electric Water Heater in Arizona?
EIA data for , updated · Source: U.S. Energy Information Administration
Running an electric water heater in Arizona costs about $50.79 a month — $617.99 a year — at the state's average rate of 15.05 ¢/kWh. That's roughly $127.70 a year less than a household paying the national average pays for the exact same electric water heater. The estimate assumes a typical 4,500-watt electric water heater running 2.5 hours/day, at the all-in average rate (delivery, fixed charges, and utility fees already included; locally billed taxes vary by area).
Key metrics
| Metric | Value |
|---|---|
| Average wattage assumption | 4,500 W |
| Typical usage assumption | 2.5 hours/day |
| Estimated monthly electricity use | 337.5 kWh |
| Estimated monthly cost | $50.79 |
| Estimated yearly cost | $617.99 |
Electric Water Heater cost vs U.S. average
At the state average rate, an electric water heater in Arizona costs $10.50 less a month than it would at the U.S. average rate.
How much electricity does an electric water heater use?
An electric water heater draws roughly 3,000-5,500 W; we use 4,500 watts running 2.5 hours/day. That comes to 11.3 kWh a day — 337.5 kWh a month, or 4106.3 kWh over a year — using kWh = watts × hours ÷ 1000. For the wattage range, amps, and how that math works, see how many watts an electric water heater uses.
An electric storage water heater stays energized 24 hours a day and cycles its heating element on and off to hold the tank at temperature and recover the hot water you use. The runtime shown here is an element-on equivalent — the heater is not off the rest of the day, it is standing by. Household size and hot-water demand drive most of the cost variability. Arizona prices that energy at 15.05 ¢/kWh, against a 18.16 ¢/kWh national average.
Electric Water Heater operating cost estimate in Arizona
| Time period | Energy use | Cost |
|---|---|---|
| Per hour | 4.50 kWh | $0.68 |
| Per day | 11.3 kWh | $1.69 |
| Per month | 337.5 kWh | $50.79 |
| Per year | 4106.3 kWh | $617.99 |
These figures use the all-in average rate. Your actual bill can run higher when separately billed taxes, seasonal pricing, and fixed monthly fees apply.
What changes the cost the most?
Two things move this number: your state's rate, which you can't change, and how hard the appliance works, which you often can. For an electric water heater, that mostly comes down to tank size, household occupancy, inlet water temperature.
Using yours more lightly or heavily than our assumption? The state calculator and usage-cost pages below model your exact scenario at the same rate.
For calculator-style comparisons, use the Electric Water Heater calculator in Arizona to compare light, typical, and heavy usage profiles.
Comparison entry points
Browse related comparisons from the energy comparison hub:
City pages for selected metros in Arizona
These city pages add local rate context for the same appliance assumptions. City values are estimates.
| City | City rate | Monthly estimate | Yearly estimate | More detail |
|---|---|---|---|---|
| Phoenix | 15.65 ¢/kWh | $52.83 | $633.91 | City electricity context |
| Tucson | 15.35 ¢/kWh | $51.81 | $621.72 | City electricity context |
| Mesa | 15.35 ¢/kWh | $51.81 | $621.72 | City electricity context |
City electricity pages focus on local rate context. The table above uses the statewide average rate.
Related appliance cost pages for Arizona
- Space Heater cost in Arizona — Typical 750-1,500 W estimate with state-specific pricing
- Window AC cost in Arizona — Typical 500-1,500 W estimate with state-specific pricing
- Portable AC cost in Arizona — Typical 700-1,400 W estimate with state-specific pricing
- Central AC cost in Arizona — Typical 2,000-5,000 W estimate with state-specific pricing
Frequently asked questions
How much does it cost to run an electric water heater in Arizona?
At 2.5 hours/day and the state average rate of 15.05 ¢/kWh, you'd pay about $50.79 a month.
Does this estimate include delivery fees and taxes?
Yes — the all-in average rate already includes delivery, fixed charges, and utility fees; locally billed taxes vary by area.
Where else can I compare this appliance?
See the appliance comparison guide, or the Arizona bill estimator for whole-household profiles.
State cost and bill pathways for Arizona
- Average power price in Arizona — What a kWh of electricity costs in Arizona
- Arizona electricity rates — Core authority page with statewide pricing context
- Electricity cost in Arizona — State-level cost, affordability, and value overview
- Electricity cost in Phoenix, Arizona — City electricity page with methodology notes where city coverage is available
- Arizona average electric bill — What a typical monthly bill looks like
- Electric bill estimator scenarios in Arizona — Estimate your bill from your monthly usage
Historical and trend pages
- Historical electricity prices in Arizona — Historical context and trend interpretation
- Electricity inflation in Arizona — State electricity inflation analysis
- Arizona electricity price volatility — Volatility and rate movement profile
Fixed-usage and calculator pathways
- Electricity cost for 300 kWh in Arizona — Cost for this usage amount in the same state
- 400 kWh cost in Arizona — Cost for this usage amount in the same state
- Electricity cost for 250 kWh in Arizona — Cost for this usage amount in the same state
- Custom usage calculator for Arizona — Custom kWh and scenario cost calculation
Appliance and estimator pathways
- Refrigerator cost in Arizona — Appliance operating-cost page for this state
- Refrigerator calculator in Arizona — Calculator page for adjusting wattage and usage for this appliance
- Space Heater cost in Arizona — Appliance operating-cost page for this state
- Space Heater calculator in Arizona — Calculator page for adjusting wattage and usage for this appliance
- Window Ac cost in Arizona — Appliance operating-cost page for this state
- Window Ac calculator in Arizona — Calculator page for adjusting wattage and usage for this appliance
State comparison pathways for Arizona
- Compare Arizona with other states — State-to-state comparison hub
- Arizona vs California electricity cost — Head-to-head comparison page
- Arizona vs Florida electricity cost — Head-to-head comparison page
Discovery and navigation hubs
- Arizona electricity hub — Guide to this state's electricity rate, usage, comparison, and tool pages
- Electricity cost scenario hub — Entry point for residential and industry scenario pages
- Arizona electricity cost overview — State-level electricity cost page with rates and typical bill context
- Average electric bill in Arizona — Typical monthly bill estimate using a standard household usage assumption
- Arizona electricity bill estimator — Household profile bill scenarios for this state
- Electricity usage hubs — Browse cost pages by common household usage tiers
Consumer electricity drivers
- Price drivers in Arizona — Understand what influences state electricity prices
Source & Method
Source: U.S. Energy Information Administration (EIA) Retail Sales of Electricity. EIA data for August 2026, updated Oct 28, 2026. Estimates use the EIA all-in average residential rate — energy, delivery, fixed charges, and utility fees together, not just the electricity itself. Fees are inside the rate, not an extra on top; how your own bill splits fixed versus per-kWh charges varies by utility. For what's inside the all-in rate, see hidden electricity fees; for how rates and estimates are defined, see the methodology hub.