Running cost comes down to wattage, hours and your rate. In District of Columbia the rate is 25.40 cents per kWh, which is 37.7 percent above the national average. Here is what that means for a hot tub.
A hot tub drawing 1,500 W costs $0.38 per hour in District of Columbia. Run 4 hours a day that is $1.52 daily, $45.72 a month and $556 a year, which is $152 more than the same appliance at the US average rate.
Hot tub cost at District of Columbia rates
Change any box. The result updates as you type.
Planning estimate. The rate box is prefilled with a regional average; the figure on your own bill is the one that matters. Power is draw while running, not while switched on.
Cost by hours used per day in District of Columbia
| Hours/day | Energy | Per day | Per month |
|---|---|---|---|
| 1 h | 1.50 kWh | $0.38 | $11.43 |
| 2 h | 3.00 kWh | $0.76 | $22.86 |
| 4 h | 6.00 kWh | $1.52 | $45.72 |
| 6 h | 9.00 kWh | $2.29 | $68.58 |
| 8 h | 12.00 kWh | $3.05 | $91.44 |
| 12 h | 18.00 kWh | $4.57 | $137 |
| 24 h | 36.00 kWh | $9.14 | $274 |
Cost by wattage at 25.40 cents
| Rated power | Per hour | Per day | Per month |
|---|---|---|---|
| 1,000 W | $0.25 | $1.02 | $30.48 |
| 1,500 W | $0.38 | $1.52 | $45.72 |
| 3,000 W | $0.76 | $3.05 | $91.44 |
| 4,500 W | $1.14 | $4.57 | $137 |
| 6,000 W | $1.52 | $6.10 | $183 |
Find the row matching the nameplate on your own unit. Within a single appliance category the spread is often wider than the difference between categories, so the label is worth reading.
What this means in District of Columbia
This appliance runs on much the same schedule regardless of climate, so the figure above is a reasonable year-round estimate for District of Columbia. What changes it is your own usage pattern rather than the weather.
Why District of Columbia pays what it does
District of Columbia has a competitive retail electricity market, so the rate used here blends households on the utility default with households on shopped supply plans. If you have never switched supplier you are probably on the default, which is usually the more expensive side of that blend. Only the generation portion of your bill changes when you switch; delivery and outage response do not.
At 25.40 cents, District of Columbia ranks 42 of 51 from cheapest to most expensive. The Northeast regional average is 25.91 cents. Roughly half of any residential bill is transmission and distribution rather than generation, which is why rates keep climbing even when fuel prices fall.
How this compares across the country
The same hot tub on the same schedule, in the cheapest and dearest states:
| State | Rate | Per month | Per year |
|---|---|---|---|
| Idaho | 12.35¢ | $22.23 | $270 |
| Utah | 12.96¢ | $23.33 | $284 |
| District of Columbia | 25.40¢ | $45.72 | $556 |
| California | 33.25¢ | $59.85 | $728 |
| Hawaii | 52.00¢ | $93.60 | $1,139 |
Lowering the number in District of Columbia
- Replace a waterlogged cover. A saturated cover conducts heat instead of blocking it, around the clock.
- Drop the setpoint a few degrees. Every degree reduces the gradient the heater fights.
- Use economy or sleep mode between uses. Cheaper than holding full temperature, without the long reheat of switching off.
- Shelter it from wind. An exposed tub loses heat far faster.
- Do not switch it off between weekly uses. Reheating from cold costs more than holding temperature.
Offsetting it with solar in District of Columbia
This load uses about 6.00 kWh a day. Covering that would take roughly 5 standard 400 W panels at typical sun hours, an array of about 2.00 kW. Because it offsets electricity worth 25.40 cents rather than the national 18.44 cents, the same array is worth more here than the national payback figures suggest.
The heater runs on its own schedule including overnight, which makes this a storage problem rather than a panel problem. Full sizing, including battery and inverter requirements, is on the solar sizing page for this appliance.