Best Power Station for a Diesel Heater
This is the one van-life load that is far smaller than it looks. The spec that decides it is capacity measured in nights, not output measured in watts.
At a glance
Quick picks
Tap any row to jump to the full write-up. Weight is a column here because it is the spec that decides whether you actually carry the thing.
| # | Product | Best for | Capacity · Weight | Price |
|---|---|---|---|---|
| 1 |  Anker SOLIX C300 | Best if the heater is the only load | 288Wh 9.1 lb | Check price |
| 2 |  BLUETTI Elite 30 V2 | Best small unit with room for a second load | 288Wh 9.5 lb | Check price |
| 3 |  EcoFlow DELTA 3 | Best for a heater plus a fridge | 1,024Wh 27.6 lb | Check price |
| 4 |  EcoFlow DELTA 2 Max | Best for a winter week off-grid | 2,048Wh 50.7 lb | Check price |
The short version: if the diesel heater is the main electrical load in your build, buy the Anker SOLIX C300 — 288Wh at 9.1 lb covers several nights of heater draw and recharges to 80% in 50 minutes. The reason that answer surprises people is that a diesel air heater's electrical appetite is tiny: a short, high glow-plug burst to light it, then a small fan-and-pump draw for the rest of the night. If the heater shares the battery with a fridge and a laptop, step up to the EcoFlow DELTA 3 at 1,024Wh.
This page exists because the search phrasing — what size power station to run a diesel heater — implies a sizing problem that barely exists, and because the wrong mental model costs people hundreds of dollars. A diesel heater does not heat with electricity. It burns fuel; the electricity runs a glow plug for ignition, a combustion fan, and a tiny metering pump. The heat is in the diesel, not in the battery.
The two draw figures that matter
Read the plate or the manual on your own heater, because models differ and we are not going to publish a single invented figure for a whole product category. What is consistent is the shape of the demand, and that shape is what you size for.
- Startup. The glow plug is the big number — tens of watts up to the low hundreds, for a couple of minutes while the unit lights. This is what the inverter and the DC port have to supply, briefly.
- Running. Once lit, the glow plug is off and only the fan and the fuel pump are drawing. This is a small, steady number, and it runs for as long as the heater runs.
- Cycling. A heater on a thermostat relights, and each relight is another glow-plug burst. A heater running continuously on low uses *less* electricity than one cycling hard on high, which is the opposite of most people's intuition.
Why the honest answer is 'smaller than you think'
Because the heater is not the load that sizes a van build — a 12V fridge is, and a laptop is, and an induction hob definitely is. A fridge cycling at 45W across 24 hours is roughly 400-550Wh a day, which is three to four times a night of heater draw. What size power station for van life works through the whole build, and if you size for the fridge the heater disappears into the margin.
Where the heater *does* change a purchase is in winter, and not through its own draw. Short days mean less solar harvest, cold means a derated battery, and long nights mean more hours of everything running. Power stations in cold weather is the page that actually governs a winter build, and the practical conclusion is to buy capacity for the season rather than for the appliance.
What a winter van night actually draws
| Load | Typical draw | Overnight / daily Wh |
|---|---|---|
| Diesel heater, glow plug at start | Tens to low hundreds of watts | A few Wh per light |
| Diesel heater, running | Small, steady; read your plate | Roughly 100-200Wh a night |
| 12V compressor fridge | 40-60W cycling | 400-550Wh a day |
| LED lights | 5-20W | 30-80Wh an evening |
| Water pump, intermittent | 40-60W when running | 10-30Wh a day |
| Laptop | 45-65W | 150-300Wh an evening |
| Phone and camera charging | 10-30W while charging | 50-100Wh a day |
| Electric blanket, 12V | 40-60W | 150-300Wh a night |
| Induction hob | 1,200-1,800W | 300-600Wh per meal |
Read down that table and the ranking is obvious: the fridge and the cooking dominate, the heater is a rounding error, and the electric blanket costs more watt-hours than the heater does. What size power station for an electric blanket explains why, and it is the most counter-intuitive sizing result on the site.
Charging it through a winter
Alternator charging is the winter answer. Solar harvest in December is a fraction of July's, and if you move every few days the engine is the most reliable input you have. EcoFlow publishes 800W of car and alternator charging on the DELTA 2 Max, which turns a two-hour drive into a meaningful top-up. Charging a power station from your alternator covers the wiring reality before you try it.
Solar is still worth having, and bifacial panels earn their keep over snow — the panel roundup has the options and how much solar input do you need has the derate maths. Just do not plan a winter build on the assumption that a 200W panel delivers 200W.
How to choose between these four
- The heater, lights and phones — Anker SOLIX C300: 288Wh, 9.1 lb, 80% in 50 minutes.
- The same, with headroom for a surprise load — BLUETTI Elite 30 V2: 600W continuous from 288Wh, 200W solar.
- The heater plus a 12V fridge — EcoFlow DELTA 3: 1,024Wh, six AC outlets, expands to 5kWh.
- A winter week parked off-grid — EcoFlow DELTA 2 Max: 2,048Wh, 800W alternator charging, expands to 6kWh.
- A permanently wired build — read power station vs a 12V house battery first; for a fixed install the wired option often wins.
What we have not done
We have not run a diesel heater from any of these units, measured a glow-plug draw, or timed a night of heat, and we will not imply we have. Every power-station figure above is the manufacturer's published specification, linked below. The heater figures are deliberately given as a shape and a formula rather than a number, because the right number is the one printed on your heater. How we choose.
The picks in full
1. Best if the heater is the only load
Anker SOLIX C300
- 288Wh
- LFP (LiFePO4)
- 300W continuous / 600W surge
- 9.1 lb
- 100W
- 80% in 50 min
- 5 years
This is the pick most people do not believe until they do the arithmetic. A diesel air heater's electrical demand is a short, high glow-plug burst at ignition and then a small, steady fan-and-pump draw for the rest of the night. 288Wh covers several nights of that on its own.
9.1 lb, 300W continuous with a 600W SurgePad, four USB-C ports up to 140W, a 120W car socket, a 10 ms switchover and 25dB at 3.3 ft. Anker publishes an 80% recharge in 50 minutes, so a short drive between spots refills it.
Anker publishes no cycle-life rating, no dimensions and no AC outlet count for this model. And 300W continuous means this unit heats you and charges your phone — it does not also run a kettle.
Reasons to buy
- 288Wh covers several nights of heater draw alone
- 9.1 lb — the lightest unit here
- 80% recharge in 50 minutes
- 10 ms switchover; 25dB at 3.3 ft
- 5-year warranty
Reasons to avoid
- No cycle-life rating published
- 300W continuous only
- 100W maximum solar input
- No published dimensions or AC outlet count
Buy it if: a heater, lights and phones in a small build.
Skip it if: a fridge, a laptop and a kettle share the same battery.
2. Best small unit with room for a second load
BLUETTI Elite 30 V2
- 288Wh
- LiFePO4 (automotive-grade)
- 600W continuous / 1,500W surge
- 9.5 lb
- 200W
- Over 3,000 cycles; 10-year lifespan
- Full in 70 min
- 5 years
Same 288Wh, but 600W continuous and a 1,500W lift, which is double the output of every other unit in this capacity class. In a van that means the heater plus something that briefly wants real power — a small inverter appliance, a tool-battery charger, a hair dryer on low that you should probably not run anyway.
BLUETTI publishes over 3,000 cycles and a 10-year lifespan, a 70-minute full recharge, a UPS switchover of 10 ms or less, 200W of solar input and nine output ports including USB-C PD 3.1 at 140W. The 200W solar ceiling is twice the Anker's, which matters for a van that sits still for days.
BLUETTI states the Elite 30 V2 does not support expansion. At 288Wh that is the ceiling you live with, and for a heater-only build it is a comfortable one.
Reasons to buy
- 600W continuous, 1,500W surge from 288Wh
- 200W solar input — best in the small class
- Over 3,000 cycles and a stated 10-year lifespan
- Full recharge in 70 minutes
- 9.5 lb; 10 ms or less switchover
Reasons to avoid
- No battery expansion, per BLUETTI
- 288Wh total
- No dimensions published
- No cycle retention threshold published
Buy it if: a heater plus occasional real loads in a small build.
Skip it if: you want expansion later.
3. Best for a heater plus a fridge
EcoFlow DELTA 3
- 1,024Wh
- LFP (LiFePO4)
- 1,800W continuous / 3,600W surge
- 27.6 lb
- 500W
- 4,000 cycles to 80%+ capacity
- 56 min at 1,500W
- 5 years
1,024Wh, 1,800W continuous, a 3,600W surge, six AC outlets among 13 outputs, and expansion to 5kWh. This is the pick for the build where the heater is one load among several — a 12V fridge cycling all day, a laptop evening, lights, a water pump and charging for everything.
EcoFlow publishes a full recharge in 56 minutes at 1,500W, a sub-10 ms switchover and 4,000 cycles to 80% or better. That cycle figure against the stricter threshold is the best longevity claim in its capacity class alongside the Anker.
500W of solar input is half what the DELTA 3 Plus takes, and that is the one difference between the two models. If you run panels on the roof and the van sits for days, pay for the Plus; if you charge from the alternator and the wall, this is the version to buy. The full comparison makes that case in detail.
Reasons to buy
- 1,024Wh with six AC outlets among 13 outputs
- 1,800W continuous, 3,600W surge
- Expands to 5kWh
- 4,000 cycles to 80%+ capacity
- Full recharge in 56 minutes; under 10 ms switchover
Reasons to avoid
- 27.6 lb — 37.1Wh per pound
- 500W solar input, half the Plus
- Bigger than a heater-only build needs
- No published surge behaviour for sustained heating loads
Buy it if: a van build where the heater shares the battery.
Skip it if: the heater really is the only thing you run.
4. Best for a winter week off-grid
EcoFlow DELTA 2 Max
- 2,048Wh
- LFP (LiFePO4)
- 2,400W continuous
- 50.7 lb
- 1000W
- 3,000 cycles to 80% capacity
- 2.3 hr; 800W car/alternator charging
- 5 years
2,048Wh and 2,400W continuous, expandable from 2kWh to 6kWh. In winter the problem is not the heater's draw, it is that the solar day is short and the nights are long — and capacity is how you ride that out.
EcoFlow publishes 1,000W of solar input, 800W of car and alternator charging, a 2.3-hour wall recharge, a sub-20 ms switchover, 15 outputs including six AC and 3,000 cycles to 80%. The alternator figure is the one that wins winters: you drive two hours and arrive with real watt-hours.
50.7 lb, and EcoFlow publishes no surge figure and no dimensions for this model on either of its pages, so we state neither. It is also far more unit than a heater needs on its own — buy it for the whole build, not for the heater.
Reasons to buy
- 2,048Wh, expandable to 6kWh
- 800W car and alternator charging
- 1,000W solar input
- 2,400W continuous; six AC outlets
- Under 20 ms switchover; 5-year warranty
Reasons to avoid
- 50.7 lb
- No surge figure published by EcoFlow for this model
- No published dimensions
- Overkill for a heater-only build
Buy it if: a winter week off-grid with everything running.
Skip it if: weight and space are tight.
Questions