Which Bioethanol Fuel Should You Buy? A UK Guide

Almost every complaint about bioethanol fireplaces — it smells, it does not burn well, it leaves residue — traces back to the fuel rather than the fireplace. Getting this right costs very little and settles the question permanently.

The short version: buy bioethanol sold expressly for fireplaces, at 96 to 97 per cent purity, in five-litre containers or larger. Everything below explains why that band is narrower than it looks.

Why 96 to 97 per cent, and not higher

Most people assume purer is better. With bioethanol it is not, and the reason is worth understanding.

At 96–97%, combustion completes properly. The fuel converts to heat, water vapour and carbon dioxide, leaving no soot, no chemical odour during the burn, and a stable flame. The remaining three to four per cent is water, and it is doing useful work: it slows evaporation and steadies the flame.

Above 97%, the fuel evaporates faster than it burns. Combustion turns aggressive and less predictable, and over time that volatility is harder on burner seals.

Below 96%, the extra water and impurities prevent complete combustion. You get less heat, a less steady flame, more smell, and residue that builds up in the burner.

So the band is real, and it is the single specification worth checking on the bottle.

What to avoid, without exception

• Methylated spirits and surgical spirit. These contain denaturing agents designed to make alcohol undrinkable, and those agents smell unpleasant when burnt. They are not made to be burnt in a living room.
• Gel fuel. A different product for different appliances. It does not belong in a liquid burner.
• Petrol, lighter fluid, white spirit, alcohol of any other kind. Different flash points, different burn behaviour, genuinely dangerous.
• Unlabelled fuel with no stated purity. If the percentage is not printed on the bottle, you have no way of knowing what you are buying.

This matters more than with most consumer products, because the consequence of the wrong choice is an open flame behaving unexpectedly. Our safety guide covers the rest.

What you should pay in the UK

Price varies enormously with quantity, and this is where most households overspend without noticing.

• Single bottles in a shop: often £5 per litre and sometimes more. The convenient option and by far the most expensive.
• Five-litre containers: around £2.50 to £3 per litre. The sensible default.
• Bulk, 25 litres and up: down towards £2 to £2.50 per litre.

Buying 25 litres at the start of the season rather than a bottle at a time roughly halves your running cost. At 0.3 to 0.6 litres an hour, 25 litres covers something like forty to eighty evenings — a full winter for most households.

Storing it properly

Bioethanol keeps well, but three rules apply:

• Sealed. Ethanol absorbs water from the air, and an open container gradually falls below the purity band that makes it burn cleanly.
• Away from heat and sunlight. A cupboard, not a windowsill, and never beside the fireplace itself.
• Out of reach. It is flammable and, despite the denaturants, should be kept well away from children and animals.

A cool, dark cupboard away from the fireplace covers all three.

Does the brand matter?

Less than the specification. A bottle stating 96–97% purity and sold for fireplaces will behave much like any other at the same purity — chemistry does not vary by logo.

Where brands differ is in what they add. Some include agents intended to reduce the brief alcohol note at lighting, or to give a more orange flame. These are refinements rather than necessities. Buy on stated purity first, then on price per litre, then on anything else.

How much will you actually use?

A bioethanol fireplace burns 0.3 to 0.6 litres per hour depending on how far the burner is opened, giving three to five hours from a full fill.

In practice:

• An evening of three hours: roughly 1 to 1.8 litres
• Twice a week through winter: roughly 50 to 90 litres a season
• A 25-litre order: a good half of a typical winter

Running a lower flame stretches this considerably, and on a quiet evening a smaller flame is often the more pleasant one. Our running costs guide works through the arithmetic.

In short

Check the bottle says 96–97% and is sold for fireplaces. Buy five litres at minimum, twenty-five if you use it often. Store it sealed, cool and dark. Never substitute methylated spirits.

Get that right and the fuel becomes a non-issue — which is exactly what it should be. If you are still choosing a fireplace, the full range is here, from the compact CUBE to the floor-standing ORA 80.