How many space heaters can run on one 15 amp circuit? Amps for 21 heaters
Amps for 21 maker-listed space heaters on high and low, and how many fit on a 15 or 20 amp circuit, at the breaker limit and at the cautious 80% limit.
Watts from each maker's product page, read by hand; amps calculated at 120 V. This is general information, not an electrician's assessment of your wiring. How we research | How links work
The short answer
One, and only if little else is on that circuit. A 1,500 W heater draws 12.5 A at 120 V, so two of them (25.0 A) trip a 15 A breaker. For a load that runs for hours, the safer limit is 80% of the breaker, 12 A or 1,440 W, which even one 1,500 W heater on high goes past. 20 of the 21 heaters below top out at 1,500 W; two heaters fit one 15 A circuit within that margin only on settings of 720 W or less, such as the 600 W low setting of Dreo's oil-filled radiators.
Check your circuit
2 heaters at 1,500 W: 25.0 A on a 15 A circuit
Over the breaker. Use one heater, or move the second to another circuit.
Amps for 21 heaters, and how many fit on one circuit
Each heater's highest and lowest stated power from its maker's page, amps at 120 V, and how many of the same heater on the same setting fit one circuit with nothing else on. "Cautious" is 80% of the breaker: 12 A (1,440 W) on 15 A and 16 A (1,920 W) on 20 A.
| Heater | Type | High | Amps on high | On high, per 15 A circuit (cautious / breaker) | Low | Amps on low | On low, per 15 A circuit (cautious / breaker) | On high, per 20 A circuit (cautious) | Source |
|---|---|---|---|---|---|---|---|---|---|
| Dreo Tower Heater 718 | Tower | 1,500 W | 12.5 A | 0 / 1 | 300 W | 2.5 A | 4 / 6 | 1 | Dreo |
| Dreo Oil-filled Radiator 153 | Oil-filled radiator | 1,500 W | 12.5 A | 0 / 1 | 600 W | 5.0 A | 2 / 3 | 1 | Dreo |
| Dreo Oil-filled Radiator 521 | Oil-filled radiator | 1,500 W | 12.5 A | 0 / 1 | 600 W | 5.0 A | 2 / 3 | 1 | Dreo |
| Vornado VH240 | Whole-room fan heater | 1,500 W | 12.5 A | 0 / 1 | 750 W | 6.3 A | 1 / 2 | 1 | Vornado |
| Vornado MVH | Whole-room fan heater | 1,500 W | 12.5 A | 0 / 1 | 750 W | 6.3 A | 1 / 2 | 1 | Vornado |
| Vornado VH10 | Whole-room fan heater | 1,500 W | 12.5 A | 0 / 1 | 750 W | 6.3 A | 1 / 2 | 1 | Vornado |
| Vornado Velocity 3R | Whole-room fan heater | 1,500 W | 12.5 A | 0 / 1 | 750 W | 6.3 A | 1 / 2 | 1 | Vornado |
| Vornado Rise 20H | Tower | 1,500 W | 12.5 A | 0 / 1 | 750 W | 6.3 A | 1 / 2 | 1 | Vornado |
| Lasko 22" Smart Ceramic Tower AR122 | Tower | 1,500 W | 12.5 A | 0 / 1 | 750 W | 6.3 A | 1 / 2 | 1 | Lasko |
| Vornado VC-01 | Ceramic | 1,500 W | 12.5 A | 0 / 1 | 785 W | 6.5 A | 1 / 2 | 1 | Vornado |
| Dreo Whole-Room Heater 714 | Portable fan heater | 1,500 W | 12.5 A | 0 / 1 | 900 W | 7.5 A | 1 / 2 | 1 | Dreo |
| Dreo Heater Atom One | Ceramic | 1,500 W | 12.5 A | 0 / 1 | 900 W | 7.5 A | 1 / 2 | 1 | Dreo |
| Dreo Heater Solaris Max (2nd Gen.) | Portable fan heater | 1,500 W | 12.5 A | 0 / 1 | 900 W | 7.5 A | 1 / 2 | 1 | Dreo |
| Dreo 2-in-1 Tower Fan & Heater 706 | Tower | 1,500 W | 12.5 A | 0 / 1 | 900 W | 7.5 A | 1 / 2 | 1 | Dreo |
| Dreo Smart Wall-Mounted Heater 719S | Wall-mounted | 1,500 W | 12.5 A | 0 / 1 | 900 W | 7.5 A | 1 / 2 | 1 | Dreo |
| Dreo Smart Wall-mounted Heater 517S | Wall-mounted | 1,500 W | 12.5 A | 0 / 1 | 900 W | 7.5 A | 1 / 2 | 1 | Dreo |
| Lasko 29" Ceramic Tower Space Heater (remote, timer) | Tower | 1,500 W | 12.5 A | 0 / 1 | 900 W | 7.5 A | 1 / 2 | 1 | Lasko |
| Lasko 9" Ceramic Space Heater CD09475 | Ceramic | 1,500 W | 12.5 A | 0 / 1 | 900 W | 7.5 A | 1 / 2 | 1 | Lasko |
| Dreo Ceramic Heater 316 | Ceramic | 1,500 W | 12.5 A | 0 / 1 | 1,000 W | 8.3 A | 1 / 1 | 1 | Dreo |
| Dreo Heater Solaris Slim H2 | Portable fan heater | 1,500 W | 12.5 A | 0 / 1 | 1,000 W | 8.3 A | 1 / 1 | 1 | Dreo |
| Vornado VH202 | Personal | 750 W | 6.3 A | 1 / 2 | 375 W | 3.1 A | 3 / 4 | 2 | Vornado |
A 0 means even one heater on that setting goes past the cautious limit. Dreo states a power range, and its lowest figure may be an ECO mode rather than a fixed setting. Your heater's own label or manual is the figure to use.
Where the limits come from
Breaker limit. Amps are watts divided by volts. At 120 V a 15 A breaker carries 1,800 W and a 20 A breaker 2,400 W before it trips. The US Army safety center makes the same point: one 1,500 W heater per 15 A breaker, with very little else on.
Cautious limit. For fixed electric heaters, the National Electrical Code counts heating as a continuous load and sizes the circuit at 125% of it (sections 424.3(B) and 210.20(A), as EC&M explains). That is the same as keeping the heater to 80% of the breaker. Portable heaters are not covered by that rule, but they also run for hours, so we use the same margin.
Plug. North Carolina's state program, quoting the fire code, requires portable heaters to plug straight into a wall receptacle, not an extension cord or power strip.
Next step
Find which outlets share the heater's circuit, add up what else runs there, and keep the total under 1,440 W on a 15 A circuit. If you need more heat in that room, ask an electrician about a dedicated circuit.
Common questions
Can I run two 1,500 W space heaters on one 15 amp circuit?
No. Two of them draw 25.0 A, well over the 15 A breaker. Even one (12.5 A) is above the 12 A cautious limit for a load that runs for hours. The US Army safety center's advice is one such heater per 15 A circuit with very little else on.
Can two heaters share a circuit on their low setting?
Only small ones. Two heaters on 600 W draw 10 A together, inside a 15 A circuit’s 12 A margin. Two on 750 W draw 12.5 A, just over it. The table shows each model’s own low setting.
How do I find out what else is on the circuit?
Switch off the breaker and see which outlets and lights go dead. Everything that loses power shares the circuit, and its watts add to the heater’s.
Can I plug a space heater into a power strip?
Many workplace rules say no. North Carolina’s state space heater program, quoting the fire code, says portable heaters must plug directly into an approved receptacle, not an extension cord or strip. Check your heater’s manual too.
Method
- Watts. Each heater's highest and lowest stated power, read by hand from the maker's own product page on 17 October 2026 (our space heater watts dataset).
- Amps. Watts / 120 V. Real voltage varies a little, and the heater's label is the figure that counts.
- How many fit. The breaker or cautious limit in watts, divided by one heater's watts, rounded down, with nothing else on the circuit.
- Not covered. We did not read the NEC itself, which is not freely available without an account; the section numbers come from EC&M. We are not electricians, and old or damaged wiring can fail below these limits.
Sources
- US Army Combat Readiness/Safety Center: Electrical space heaters (one 1,500 W heater per 15 A breaker), read 2026-10-17
- EC&M Code Q&A (Mike Holt): fixed electric space heating is a continuous load, circuit at 125% (NEC 424.3(B), 210.20(A)), read 2026-10-17
- North Carolina Office of State Human Resources: Space Heater Use Program (plug directly into a receptacle) (PDF), read 2026-10-17
- Maker product pages for each heater, linked in the table, read 2026-10-17
- Our space heater watts dataset, CSV
Changes
- : Published. 21 heaters from our space heater watts dataset, each read on the maker’s page on 17 October 2026.