How long will a Bluetti AC2A run a gas combi boiler?
About 2.5 hours — 2 h 31 min typically, from 2 h 22 min in the worst case to 2 h 40 min at best. That assumes a gas combi boiler pulling 85 W for 60% of the time (average 51 W), plus the station's 8 W AC mains socket overhead — 59 W in total out of 148 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 | 59 W | 2 h 22 min | 2 h 31 min | 2 h 40 min |
| 2 × gas combi boiler, UK 230 V | 110 W | 1 h 16 min | 1 h 21 min | 1 h 26 min |
| 1 × gas combi boiler, US 120 V | 59 W | 2 h 22 min | 2 h 31 min | 2 h 40 min |
- 0.3 nights of eight hours, or 0.1 days of continuous running.
- Usable energy: 148 Wh of the 204 Wh on the box, after chemistry, inverter losses and the reserve.
- To keep it going for a full 24 hours you would need about 1,948 Wh of rated capacity — 9.6× this station.
- Start-up: the gas combi boiler asks for 85 W at switch-on against this station's 600 W peak — comfortable.
Buy the Bluetti AC2A
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 | 2 h 19 min | -8% |
| The pack is five years old | 2 h 1 min | -20% |
| It is −10 °C outside | 2 h 8 min | -15% |
| You run it flat, no reserve | 2 h 47 min | +11% |
| You keep 20% back | 2 h 14 min | -11% |
If you need it to run longer
These run a gas combi boiler for at least twice as long as the Bluetti AC2A does, cheapest first.
| Station | Wh | Typical | Indicative price |
|---|---|---|---|
| Bluetti AC50B | 448 | 5 h 26 min | £299 / $399 |
| DJI Power 500 | 512 | 6 h 12 min | £399 / $449 |
| Jackery Explorer 1000 v2 | 1,070 | 12 h 45 min | £419 / $549 |
| EcoFlow RIVER 2 Max | 512 | 6 h 12 min | £449 / $349 |
The cheapest step up: Bluetti AC50B
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
Nothing smaller than the Bluetti AC2A runs a gas combi boiler for a useful length of time.
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