How long will a Bluetti EB70S run a gas combi boiler?
About 8.5 hours — 8 h 32 min typically, from 8 h 2 min in the worst case to 9 h 2 min at best. That assumes a gas combi boiler pulling 85 W for 60% of the time (average 51 W), plus the station's 10 W AC mains socket overhead — 61 W in total out of 520 usable watt-hours.
The gas makes the heat, so a battery only has to run the fan, pump and controls. Most boilers are wired into a fused spur rather than a plug, and some will not light on a station’s ungrounded output — read the boiler guide before relying on it.
Before you rely on it
The battery is the easy part. Most boilers are wired into a fused spur with no plug, and some will not light on a station's floating output because they sense the flame through earth. The boiler guide explains both problems and who can fix them.
The numbers
| Setup | Average draw | Cautious | Typical | Best case |
|---|---|---|---|---|
| 1 × gas combi boiler, UK 230 V | 61 W | 8 h 2 min | 8 h 32 min | 9 h 2 min |
| 2 × gas combi boiler, UK 230 V | 112 W | 4 h 22 min | 4 h 39 min | 4 h 55 min |
| 1 × gas combi boiler, US 120 V | 61 W | 8 h 2 min | 8 h 32 min | 9 h 2 min |
- 1.1 nights of eight hours, or 0.36 days of continuous running.
- Usable energy: 520 Wh of the 716 Wh on the box, after chemistry, inverter losses and the reserve.
- To keep it going for a full 24 hours you would need about 2,014 Wh of rated capacity — 2.8× this station.
- Start-up: the gas combi boiler asks for 85 W at switch-on against this station's 1,400 W peak — comfortable.
Buy the Bluetti EB70S
Where to buy
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If this is for a power cut
Heating is what a battery does worst. In a power cut, warming people rather than rooms goes much further, and none of this needs a socket.
Without a power station: a 20,000 mAh power bank runs a USB heated throw for about 7 h 24 min. See the power bank numbers.
Hot water bottle and a vacuum flask. Boil water while you still can, keep it hot in a flask, and refill the bottle through the night.
Look for: A bottle made to BS 1970 in the UK, and a flask of a litre or more.
Hand warmers. Air-activated packs give hours of heat with no power at all, and a pocketful helps children and older relatives.
Look for: Long-duration packs, and the expiry date on bulk boxes.
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More: How to keep warm in a power cut, and the power cut essentials list (US edition).
What changes the answer
| If instead… | Typical runtime | Change |
|---|---|---|
| The pack is two years old | 7 h 51 min | -8% |
| The pack is five years old | 6 h 49 min | -20% |
| It is −10 °C outside | 7 h 15 min | -15% |
| You run it flat, no reserve | 9 h 29 min | +11% |
| You keep 20% back | 7 h 35 min | -11% |
If you need it to run longer
These run a gas combi boiler for at least twice as long as the Bluetti EB70S does, cheapest first.
| Station | Wh | Typical | Indicative price |
|---|---|---|---|
| Jackery Explorer 2000 v2 | 2,042 | 23 h 11 min | £849 / $999 |
| OUKITEL P2001 Ultimate | 2,000 | 22 h 43 min | £999 / $1,099 |
| Bluetti AC240 | 1,536 | 17 h 10 min | £1,099 / $999 |
| OUKITEL BP2000 | 2,048 | 23 h 16 min | £1,099 / $1,199 |
The cheapest step up: Jackery Explorer 2000 v2
Amazon and approved-programme links are affiliate links; the site may earn a commission at no extra cost to you. Links marked “official site” are untracked. Prices and stock change constantly — check before you buy.
Smaller options that still work
| Station | Wh | Typical | Weight | Indicative price |
|---|---|---|---|---|
| UGREEN PowerRoam 600 | 680 | 8 h 14 min | 8.4 kg | £449 / $499 |
| Goal Zero Yeti 700 | 677 | 8 h 12 min | 9.2 kg | — / $700 |
| Jackery Explorer 600 Plus | 632 | 7 h 47 min | 7.3 kg | — |
| EcoFlow RIVER 2 Max | 512 | 6 h 12 min | 6 kg | £449 / $349 |
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