Why does the EcoFlow DELTA 3 Plus run a space heater for so little time?

Because it draws a lot of power. A space heater averages about 750 W (1,500 W running, on about 50% of the time), and the 1,024 Wh battery gives about 870 Wh after inverter losses. That is 86% of the battery an hour.

What would run a space heater longer?

A bigger battery: the 2,042 Wh Jackery Explorer 2000 v2 about 2.5 hours and the 2,048 Wh Anker SOLIX C2000 Gen 2 about 2.5 hours. Or add expansion batteries: at 5,000 Wh, the EcoFlow DELTA 3 Plus would run it about 5.5 hours.

EcoFlow · Will it run?

Can the EcoFlow DELTA 3 Plus run a space heater (1500W)?

Published October 12, 2026

Short answerYes, briefly

Yes, but only for about 1 hour. A space heater averages about 750 W, and the EcoFlow DELTA 3 Plus holds 1,024 Wh (about 870 Wh usable after inverter losses), so the battery runs down fast. Fine for a short job, not for a whole day.

Add your other devices

Key numbers

Runtime: 1 hr; from a full charge
Battery used per hour: 86%; at 750 W average

Space heater (1500W)

Running: 1,500 W; 750–1500 W range
Start-up: 1,500 W
Average: 750 W; on 50% of the time

EcoFlow DELTA 3 Plus

Battery: 1,024 Wh; about 870 Wh usable
Output: 1,800 W; continuous
Surge: 3,600 W; start-up peak

How we worked it out: 1,024 Wh × 0.85 ÷ 750 W average (1,500 W × 0.5 duty) = about 1 hour. The 0.85 covers inverter and battery losses. We do not test units ourselves; the numbers come from the official spec sheets and typical device draws. How we pick

EcoFlow DELTA 3 Plus

1,024 Wh · 1,800 W output · 3,600 W surge · 27.6 lb

Full specs and runtimes

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What else the EcoFlow DELTA 3 Plus runs

One device at a time, from a full charge.

Other power stations for a space heater

The nearest sizes that run it longer.

Keep going

Real runtime depends on the model you own, room temperature and battery age. The 1 hour above is an estimate, not a measured result.

Common questions

Why does the EcoFlow DELTA 3 Plus run a space heater for so little time?: Because it draws a lot of power. A space heater averages about 750 W (1,500 W running, on about 50% of the time), and the 1,024 Wh battery gives about 870 Wh after inverter losses. That is 86% of the battery an hour.
What would run a space heater longer?: A bigger battery: the 2,042 Wh Jackery Explorer 2000 v2 about 2.5 hours and the 2,048 Wh Anker SOLIX C2000 Gen 2 about 2.5 hours. Or add expansion batteries: at 5,000 Wh, the EcoFlow DELTA 3 Plus would run it about 5.5 hours.