How long will a Bluetti AC50B run a gas combi boiler?
About 5.4 hours — 5 h 26 min typically, from 5 h 7 min in the worst case to 5 h 45 min at best. That assumes a gas combi boiler pulling 85 W for 60% of the time (average 51 W), plus the station's 9 W AC mains socket overhead — 60 W in total out of 326 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 | 60 W | 5 h 7 min | 5 h 26 min | 5 h 45 min |
| 2 × gas combi boiler, UK 230 V | 111 W | 2 h 46 min | 2 h 56 min | 3 h 7 min |
| 1 × gas combi boiler, US 120 V | 60 W | 5 h 7 min | 5 h 26 min | 5 h 45 min |
- 0.7 nights of eight hours, or 0.23 days of continuous running.
- Usable energy: 326 Wh of the 448 Wh on the box, after chemistry, inverter losses and the reserve.
- To keep it going for a full 24 hours you would need about 1,981 Wh of rated capacity — 4.4× 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 AC50B
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 | 4 h 59 min | -8% |
| The pack is five years old | 4 h 20 min | -20% |
| It is −10 °C outside | 4 h 37 min | -15% |
| You run it flat, no reserve | 6 h 2 min | +11% |
| You keep 20% back | 4 h 49 min | -11% |
If you need it to run longer
These run a gas combi boiler for at least twice as long as the Bluetti AC50B does, cheapest first.
| Station | Wh | Typical | Indicative price |
|---|---|---|---|
| Jackery Explorer 1000 v2 | 1,070 | 12 h 45 min | £419 / $549 |
| EcoFlow DELTA 2 | 1,024 | 11 h 49 min | £549 / $699 |
| Jackery Explorer 1000 Plus | 1,264 | 14 h 49 min | £549 / $999 |
| EcoFlow DELTA 3 Plus | 1,024 | 12 h | £599 / $799 |
The cheapest step up: Jackery Explorer 1000 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 |
|---|---|---|---|---|
| Bluetti AC60 | 403 | 4 h 53 min | 9.1 kg | £449 / $599 |
| Bluetti Elite 30 V2 | 288 | 3 h 46 min | 4.3 kg | £229 / $449 |
| Goal Zero Yeti 300 | 297 | 3 h 40 min | 6.2 kg | — / $350 |
| ALLPOWERS R600 | 299 | 3 h 37 min | 5.6 kg | £199 / $219 |
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