Heated Running Cost Table
| Heated thing (typical use) | Draw | Per use at 18.31¢/kWh | Per season |
|---|---|---|---|
| Heated driveway snow-melt (400 sq ft at 35 W/sq ft, one 6 h storm) | 14.0 kW | $15.38 per storm | $153.80 over a 10-storm winter |
| Engine block heater (750 W, 4 h before start) | 0.75 kW | $0.55 per morning | $54.93 over a 100-morning winter |
| Space heater (1500 W, 8 h a day) | 1.5 kW | $2.20 per day | $329.58 over a 150-day winter |
| Electric blanket (100 W, 8 h a night) | 0.1 kW | $0.15 per night | $17.58 over a 120-night winter |
| Heated mattress pad (90 W, 8 h a night) | 0.09 kW | $0.13 per night | $15.82 over a 120-night winter |
| Pipe heat tape (60 ft at 5 W/ft, 24 h cold snap) | 0.3 kW | $1.32 per day | $39.55 over a 30-day freeze |
| Heated towel rack (90 W, 5 h) | 0.09 kW | $0.08 per use | $12.36 over 150 uses |
| Sauna heater (6 kW, 1 h session) | 6.0 kW | $1.10 per session | $57.13 at weekly for a year |
| Heated gloves (10 W charger, 6 h) | 0.01 kW | $0.01 per charge | $1.32 over 120 charge days |
| Same warmth, different bills | Session energy | At 12.7¢ (LA) | At 18.31¢ (US avg) | At 48.0¢ (HI) |
|---|---|---|---|---|
| Driveway storm cycle (84 kWh) | 84.00 kWh | $10.67 | $15.38 | $40.32 |
| Space heater day (12 kWh) | 12.00 kWh | $1.52 | $2.20 | $5.76 |
| Block heater morning (3 kWh) | 3.00 kWh | $0.38 | $0.55 | $1.44 |
| Blanket night (0.8 kWh) | 0.80 kWh | $0.10 | $0.15 | $0.38 |
| Mattress pad night (0.72 kWh) | 0.72 kWh | $0.09 | $0.13 | $0.35 |
Every winter device sells warmth by the watt, but you pay by the kilowatt-hour - and the spread between the cozy and the crazy is three orders of magnitude wide. This table prices the whole heated menagerie at the 18.31 cents per kWh national residential average (EIA Electric Power Monthly, July 2026): the per-use cost of a storm, a morning, a night, and the honest season total behind each row.
The shape of the answer: small, personal heat is nearly free. A heated mattress pad costs about 13 cents a night, an electric blanket 15, a block heater 55 cents to save a cold start. Whole-space heat is where bills are made: a 1,500 W space heater is $2.20 a day, and one snow-melt cycle on a 400 sq ft driveway is $15.38 - more than the mattress pad costs for four months of nights.
Two levers move every row: hours and rate. The watts are mostly fixed by the device, but hours are yours to cut (timers, sensors, pre-warm windows), and the rate is the one number to take from your own bill - Hawaii pays 48 cents where Louisiana pays about 13, so the same driveway storm costs $40.32 in Honolulu and $10.67 in New Orleans.
How to use
- Find your device row - the assumptions (watts, hours, uses) are printed in each label, and they are deliberately typical; swap in your own numbers in the mini-calculator below the tables.
- Read per use first, then per season - the season column is where affordability actually lives, because nobody buys one storm or one night.
- Run the mini-calculator with your device nameplate watts, your real hours, and the rate straight from your utility bill.
- Cut hours before watts: a timer that trims a space heater from 8 hours to 5 saves more than upgrading any blanket.
Frequently asked questions
How much does it cost to run a 1500 watt heater for an hour?
At the 18.31 cents per kWh national average, 1,500 W for one hour is 1.5 kWh - about 27 cents. Eight hours a day is $2.20, and a 150-day heating season lands near $330. In high-rate states the same heater costs 72 cents an hour, which is why the wattage on the box matters less than the rate on your bill.
Is it cheaper to run an electric blanket or a space heater?
The blanket wins by roughly a factor of fifteen: about 100 W for a night is 15 cents, while a 1,500 W space heater for the same 8 hours is $2.20. Heat the body, not the room, and the winter total drops from hundreds of dollars to about $18 - that is the entire logic of heated pads, throws and gloves.
How much does a heated driveway cost per storm?
A 400 sq ft electric snow-melt zone at the design load of 35 W per sq ft draws 14 kW; a six-hour storm cycle uses about 84 kWh, which is $15.38 at the national average rate - call it $130-160 over a ten-storm winter. Hydronic systems shift the same heat onto gas and often halve that. The full install-versus-plow math lives on the heated driveway calculator.
Do block heaters and pipe heat tapes really use much power?
Less than people fear, more than people check: a 750 W block heater run 4 hours before start is 55 cents a morning, about $55 over a 100-cold-morning winter. Pipe heat tape is the sleeper - 60 feet at 5 W per foot, left on around the clock through a 30-day freeze, adds about $40. Both reward a timer or thermostat cord more than any brand choice.
Why is my bill higher than these numbers?
Three honest reasons: your rate is probably not 18.31 cents (take it from the bill - the state spread is nearly 4x), the table assumes nameplate watts while thermostats and aging elements cycle, and idle hours count too - a heat tape forgotten in March runs until someone unplugs it. The mini-calculator with your own three numbers beats any national table.