Home backup · US 120 V
Best power station for a space heater
Ranked by a calculation, not an opinion — and here it splits hardest from the marketing. Five of these hold a 1,500 W heater; none is shown to run it for four hours.
Our pick
Yes, it runs it 1.1 h see why below ↓
Short of the 4 h target
from a published usable capacity, with the machine’s own 25 W idle draw in the denominator
Derived from official coefficients + Derived by WattPairverified 2026-08-0812 US records method
The bar under usable energy is full and then some: over 4 h this set asks for 367% of what this machine can deliver — 267% more energy than it holds. The bar stops at its own end; the figure does not.
Jackery Explorer 2000 Plus — the longest anything here can be SHOWN to last on this set, 1.1 h — short of the 4 h this page ranks against, and stated rather than rounded up. Larger records exist; we have found no usable capacity published for them, so a duration for them would be a guess. $899, price checked 2026-08-17.
Said plainly, because the panel above cannot: this record’s own 2,042.8 Wh nameplate puts an absolute ceiling of 1.3 h on this set — short of the 4 h this page ranks against, and that is before any depth-of-discharge or inverter loss is taken off it. It is the recommendation because it is the cheapest record here that clears this load outright and can be bought today, not because it can be shown to run it for 4 h. Nothing on this page reaches that target on this set. A cheaper record with this same property would not be named under this pick at all; the pick is held to the standard it holds them to.
Usable energy · Derived from official coefficients · verified 2026-08-08
This set, 4 h · draw × duty cycle × hours
The buy link is in the bar at the bottom of the screen — one action per page, and it goes to the merchant we last checked this price at.
Every row opens the calculator, pre-filled, each figure below sourced — re-run any number yourself.
How this list is ordered
Four gates, in this order: does it run the set, can we prove how long, can it be bought today, then price. No score and no weighting.
The four gates in full
Applied in this order to every published US record. There is no score and no weighting — each gate either separates two machines or hands them to the next one.
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1 Does it run the set?
Every record is put through the compatibility engine against all of the loads at once — running watts against continuous output, the worst start-up instant against the surge ceiling, waveform where a load demands one. Green first, then the tight fits, then anything the engine could not read, then the machines that cannot do it. A machine that cannot start the load in front of it is not a cheaper option.
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2 Can we prove how long?
A runtime is only printed where the brand publishes what it takes to compute one — a usable-capacity coefficient, whether stated as depth of discharge and inverter efficiency or as one combined figure — and never from the number on the box. Records that reach the target sort first, records with a proven but shorter figure next (longest first: inside that band none of them does the job, so the one that gets closest wins), and records whose duration cannot be proven at all sort last inside their verdict band. That is a statement about published data, not about the hardware, and each of those rows says so.
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3 Can it be bought today?
A record under a verified out-of-stock policy, or one we may not sell into your state, sorts behind an equivalent one that can be bought. It stays on the list with the reason attached rather than disappearing. Whether WattPair happens to hold a purchase link for a record is not part of this gate and never moves it: a machine we cannot link to is ranked exactly as if we could, and simply carries no buy button.
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4 Then price.
Cheapest first, inside everything above. One mains standard and one currency per page, so every comparison is like for like. A record with no verified price sorts to the back of its own band — the absence of a price is not a low price.
The loads this ranks against
Why this set, and where its figures come from
One 1,500 W portable electric heater, on its own, on its high setting. It is a resistive load: a coil, a fan and a thermostat, with no motor and therefore no start-up current — which is why the start-up column below says we found nothing rather than giving a figure, and why a bigger surge rating buys you nothing on this page. The one assumption worth naming is the duty cycle. A real heater has a thermostat and cycles; we have found no published figure for how often, and it depends on your room rather than on the heater, so this page assumes the element is on continuously. That is the conservative end, deliberately, and a well-insulated room will do better than every figure below.
Electric space heater (1500 W)
- Running
- 1,500 W
- Start-up
- none found
- Duty cycle
- 100%
Official spec · verified 2026-08-01 · high confidence · start-up basis: None found
- Running together
- 1,500 W
- Worst start-up instant
- 1,500 W
- Average draw
- 1,500 W
- Energy for 4 h
- 6,000 Wh
Why 4 hours
Four hours — the shortest span this site tracks, and still out of reach. Twelve hours of this load is 18 kWh, which is not a hard target so much as a category error: it is more than four times the nameplate of the largest record here, so a twelve-hour ranking would separate nothing. At four hours the arithmetic is still brutal and still legible — 6 kWh against a library whose biggest battery is 4,096 Wh — and the finding is the same one either way. An electric heater is the one load where a power station is a bridge of an hour or two, not a night. The rows say by how much, per machine, with each figure’s source.
Derived by WattPairverified 2026-08-01appliance records method
No start-up figure has been found for some of these loads
We have found no published inrush figure for these loads. This library does not invent one. They are electronics rather than motors, so there is no rotor to break free and no reason to expect one; the engine says so rather than assuming a number in either direction.
Applies to: Electric space heater (1500 W)
All 12 US records, ranked
5 of the 12 US records we publish run this set, 7 publish enough for a runtime to be proven, and 9 can be bought today. The percentage is the set as a share of that machine's continuous output; past 82% a verdict drops out of the green.
- 1 Jackery Explorer 2000 Plus Jackery · US 120 V 3,000 W continuous · 6,000 W surge ceiling 2,042.8 Wh nameplate · Official spec · verified 2026-08-01 Runs it50%
- 2 BLUETTI Elite 200 V2 BLUETTI · US 120 V 2,600 W continuous 2,073.6 Wh nameplate · Official spec · verified 2026-08-01 Runs it58%
- 3 Jackery Explorer 1000 Plus Jackery · US 120 V 2,000 W continuous · 4,000 W surge ceiling 1,264.6 Wh nameplate · Official spec · verified 2026-08-01 Runs it75%
- 4 EcoFlow DELTA 2 Max EcoFlow · US 120 V 2,400 W continuous · 4,800 W surge ceiling 2,048 Wh nameplate · Official spec · verified 2026-08-01 Runs it63%
- 5 EcoFlow DELTA Pro 3 EcoFlow · US 120 V 4,000 W continuous · 8,000 W surge ceiling 4,096 Wh nameplate · Official spec · verified 2026-08-01 Runs it38%
- 6 Jackery Explorer 1000 v2 Jackery · US 120 V 1,500 W continuous · 3,000 W surge ceiling 1,070 Wh nameplate · Official spec · verified 2026-08-01 Tight fit100%
- 7 BLUETTI Elite 100 V2 BLUETTI · US 120 V 1,800 W continuous · 3,600 W surge ceiling 1,024 Wh nameplate · Official spec · verified 2026-08-01 Tight fit83%
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Photo shows the EU 230V version — page specs are US 120V. 8 EcoFlow DELTA 3 Plus EcoFlow · US 120 V 1,800 W continuous · 3,600 W surge ceiling 1,024 Wh nameplate · Official spec · verified 2026-08-01 Tight fit83% - 9 BLUETTI Elite 30 V2 BLUETTI · US 120 V 600 W continuous 288 Wh nameplate · Official spec · verified 2026-08-01 Too big250%
- 10 Jackery Explorer 300 Plus Jackery · US 120 V 300 W continuous · 600 W surge ceiling 288 Wh nameplate · Official spec · verified 2026-08-01 Too big500%
- 11 EcoFlow RIVER 3 Plus EcoFlow · US 120 V 600 W continuous · 1,200 W surge ceiling 286 Wh nameplate · Official spec · verified 2026-08-01 Too big250%
- 12 EcoFlow STREAM Ultra EcoFlow · US 120 V 800 W continuous 1,920 Wh nameplate · Official spec · verified 2026-08-01 Too big188%
Why 3 records rank below machines they out-spec
3 of the 12 records here start and hold this load set and still rank below machines they out-spec, for one reason: we have found no depth of discharge and no inverter efficiency published by EcoFlow for them, so the hours a reader actually wants cannot be computed from anything but the number on the box — and dividing a nameplate by a load is the one thing this site will not do. The other side of that is BLUETTI and Jackery: they are the only brands here that publish both, which is the whole reason every proven runtime above belongs to them. The rule rewarded disclosure, not hardware.
What their rows do carry is the bound: that record’s nameplate over this set’s average draw of 1,500 W, which is arithmetic anyone can redo against the summary above — floored, never rounded up, so the printed ceiling never claims an hour more than the number supports — and it is printed on every one of those rows. But it is a ceiling and not a duration: it assumes the pack surrenders every watt-hour printed on it and that the inverter loses nothing turning DC into AC, and no battery does either. The real hours sit somewhere below that ceiling, and the two missing figures are exactly what would say how far below. That is the difference between a number this page will print and a number it will not.
The scope of that finding, stated: as of 2026-08-08 we read each manufacturer’s own published documents for these 3 models and found no depth-of-discharge and no inverter-efficiency figure in them. It is a statement about what those documents contained on that date — not a claim that the number exists nowhere. Send us one that is published and the record moves, and the row moves with it. Two counts are in play on this page and both are right: for 5 of the 12 records in this pool we have found neither figure published, which is the number the summary above is the other side of, and the 3 named here are the ones that got far enough up the ranking for it to cost them a position. This is a statement about published data, not about the hardware — the verdict column judges that separately, and it comes first.
The load that changes the answer
Add a full-size refrigerator to the same set and the first gate does not move: 5 of the 12 still clear it outright, against 5 on the set above. The reason is one instant: a full-size refrigerator asks for 286 W at start-up on its own — 5.2× its own running draw, against 1,500 W for everything on the list above put together. That start-up figure is a category envelope: we have found no published start-up rating for this unit itself. Which is the whole shape of this scenario in one sentence: next to a 1,500 W heater a refrigerator is electrically free, and it is not free at all in the only currency that matters here, which is watt-hours. The quiz carries this set as a preset.
start-up figure: Derived from official coefficients · verified 2026-08-01 · low confidence
The other rankings
Where to go next
Questions people ask about this list
How many of the 12 actually run it?
Why is every heater on the shelf 1,500 W?
Pricing, ranking and how the site is funded are not questions about this list — they are the same on every page here, and they are set out in full in the price policy and how the money works.