Not every room needs 1,500W, and wattage is the only thing that reliably changes what an electric heater costs to run — every one of them, whatever the technology, converts essentially 100% of its input into heat. So a 600W heater costs 60% less per hour than a 1,500W one, guaranteed: $0.11 against $0.28 at the US average residential price of 18.44¢/kWh (EIA Electric Power Monthly, May 2026). The catch is capacity: at 10 watts per square foot, 600W suits about 60 sq ft. These are the 200W–1,000W heaters that deliver usable heat in the small spaces they are actually sized for.
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*Cost figures assume the element is energised for the stated hours at the US average residential price of18.44¢/kWh (EIA Electric Power Monthly Table 5.6.A, May 2026); monthly figures are 8 hours a day over 30 days, and a thermostat cycling the element off lowers them. Room sizes are the 10 watts per square foot sizing rule applied to rated wattage, not the manufacturer's marketing number. Your cost will vary by state and usage pattern. Calculate your exact cost →
The NY1507-14A is the pick because of its 600W setting, and the reason is pure arithmetic: at $0.11 an hour it costs 60% less than the same heater at 1,500W ($0.28), because wattage is the only thing that changes what a resistance heater costs. The oil holds heat between cycles, which keeps the room temperature steady rather than reducing consumption. Three settings — 600W, 900W, 1,500W — let you bring the room up on high and then hold it on low, which is the practical way to use it. A well-insulated bedroom of around 60 sq ft will hold at 600W; use the 10 watts per square foot rule to check yours.
At 200W the MyHeat is the lowest-draw heater here, and it is honest about what that buys: personal heating, warming the air immediately around you rather than a room. 200W is 682 BTU/hr, so do not expect it to change the temperature of a space. For keeping your hands warm at a desk or taking the edge off next to a bed it works well, and at $0.04 an hour it costs about as much to run as a few LED bulbs.
The Brightown delivers 400W of ceramic heat in a very small footprint, with a second 800W setting and a thermostat that cycles the element off at temperature. At 400W it costs $0.07 an hour, roughly a quarter of a 1,500W heater's $0.28 — again because of the wattage, not the ceramic. 400W is 1,365 BTU/hr, which at 10 watts per square foot suits about 40 sq ft: a very small office or a desk area, not a room.
Dreo's smart oil heater runs at 900W or 1,500W, and the 900W setting draws 40% less power — which is exactly 40% less money, $0.17 an hour against $0.28. The app schedules heating around when the room is occupied, and every hour it removes is an hour you do not pay for. Its energy tracking is genuinely useful because most people badly underestimate how many hours their heater is actually energised. For a bedroom used 8 hours a day, 900W costs $40/month instead of $66.
The UberHeat is a 1,000W ceramic heater with a genuine thermostat rather than just high/low switches. That matters: once the room reaches temperature the thermostat holds the element off for part of each hour, so your average draw falls below the 1,000W nameplate. How far below depends on the room, the insulation and the setpoint, so treat $0.18/hour and $44/month as the ceiling rather than the expectation. The compact cube fits on a nightstand and the cool-touch housing suits tight spaces.
The HS-1000-WX is a 1,000W wall-mount infrared panel with no fan at all, so it runs silently and frees the floor. Infrared warmth lands on you directly and is felt within seconds, which often means you switch the heater on later and off earlier — the one honest route to a lower bill. It does not deliver more heat per watt: 1,000W is 3,412 BTU/hr, suiting about 100 sq ft at 10 watts per square foot, whatever the 500 sq ft figure on the listing suggests. WiFi scheduling is the feature that actually cuts energised hours.
| Model | Wattage | Room Size | Cost/Hour | Best For | |
|---|---|---|---|---|---|
| Pelonis NY1507-14A | 600–1,500W | ~150 sq ft | $0.11–$0.28 | Low-cost room heating | Amazon → |
| Lasko 100 MyHeat | 200W | Personal — not a room | $0.04 | Desk / bedside | Amazon → |
| Brightown Mini | 400–800W | ~80 sq ft | $0.07–$0.15 | Dorm / small office | Amazon → |
| Dreo Smart Oil | 900–1,500W | ~150 sq ft | $0.17–$0.28 | Smart scheduling | Amazon → |
| Honeywell UberHeat | 1,000W | ~100 sq ft | $0.18 | Compact with thermostat | Amazon → |
| Heat Storm HS-1000-WX | 1,000W | ~100 sq ft | $0.18 | Wall-mount infrared | Amazon → |
Cost per hour is each heater's rated wattage at the US average residential electricity price of 18.44¢/kWh (EIA Electric Power Monthly Table 5.6.A, May 2026), with the element energised throughout; where a heater has more than one setting the range spans them, and a thermostat cycling the element off reduces the figure. Room size is the 10 watts per square foot sizing rule applied to rated wattage, not the manufacturer's marketing number. Low wattage is the whole point of this page: every electric heater converts essentially 100% of its input into heat, so drawing fewer watts is the only way to spend less per hour.