A chimney balloon is an inflatable or wool draught blocker placed up an unused chimney to stop cold air falling into the room.
Prices checked on Amazon UK, 27 October 2026.
A chimney balloon is an inflatable or wool draught blocker placed up an unused chimney to stop cold air falling into the room. Measure your flue opening before you buy — small, medium and large rectangles suit different fireplaces. This guide compares chimney balloons and wool Chimney Sheep-style blockers on Amazon UK using size claims from each listing. Never light a fire with a balloon or blocker still in place; remove it first. We found 8 chimney balloons in stock on Amazon UK with a live buy-box price when we checked on 27 October 2026. Our overall pick is the Chimney Balloon Medium 14x24 at £19.00, the budget pick is the Balloon for Chimney Small Rectangle at £16.80, and our pick wool Chimney Sheep is the Chimney Sheep 14x24 Wool Blocker at £56.00. Prices and stock change often, so check both on Amazon before you buy.
Quick comparison
| Product | Price | Best for | Size (listing) | Type | Shape | Pack | Brand line |
|---|---|---|---|---|---|---|---|
| Chimney Balloon Medium 14x24 | £19.00 | Overall medium | 14 x 24 in | Inflatable | Rectangle | Single | Chimney Balloon |
| Balloon for Chimney Small Rectangle | £16.80 | Lowest price | 38 x 23 cm / 15 x 9 in | Inflatable | Rectangle | Single | – |
| Chimney Sheep 14x24 Wool Blocker | £56.00 | Wool 14x24 | 14 x 24 in | Wool | Rectangle | Single | Chimney Sheep |
| Chimney Balloon Small 15x9 | £17.50 | Small 15x9 | 15 x 9 in | Inflatable | Rectangle | Single | Chimney Balloon |
| Chimney Balloon Square 14x14 | £18.00 | Square 14x14 | 14 x 14 in | Inflatable | Square | Single | Chimney Balloon |
| Balloon for Chimney Medium 60x30cm | £18.60 | Medium 60x30 | 60 x 30 cm / 24 x 12 in | Inflatable | Rectangle | Single | – |
| Chimney Sheep 8 Inch Round Wool | £21.00 | Round 8in wool | 8 in round | Wool | Round | Single | Chimney Sheep |
| Chimney Balloon Large 14x38 | £19.00 | Large 14x38 | 14 x 38 in | Inflatable | Rectangle | Single | Chimney Balloon |
Specs from each Amazon UK listing (– = not stated on the listing); prices checked on Amazon UK on 27 October 2026.
Our picks
Chimney Balloon Medium 14x24
Chimney Balloon Medium 14x24
£19.00
Best overall
Balloon for Chimney Small Rectangle
Balloon for Chimney Small Rectangle
£16.80
Best budget
Chimney Sheep 14x24 Wool Blocker
Chimney Sheep 14x24 Wool Blocker
£56.00
Best for families
How we pick
We shortlist products sold on Amazon UK using capacity, features, customer ratings and price band. We do not lab-test every model unless a page says so. The Amazon page is the live price. How we recommend.
Compare at a glance
| Product | Last Amazon price | Buy |
|---|---|---|
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£19.00
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£16.80
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£56.00
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£17.50
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£18.00
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£18.60
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£21.00
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£19.00
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The products
Buying advice
Our top picks
Best overall: Chimney Balloon Medium 14x24 (£19.00). Chimney Balloon medium 14 × 24 inch inflatable draught excluder on the listing. A standard size for many UK fireplaces.
Best budget: Balloon for Chimney Small Rectangle (£16.80). The cheapest pick here. Small rectangle chimney balloon about 38 × 23 cm (15 × 9 in) on the title.
Best wool blocker: Chimney Sheep 14x24 Wool Blocker (£56.00). Chimney Sheep 14 × 24 inch wool chimney draught excluder and blocker on the listing. Larger wool option for a snug fit.
Other chimney draught blockers worth a look
Chimney Balloon Small 15x9 (£17.50). Chimney Balloon small 15 × 9 inch inflatable draught excluder on the listing.
Chimney Balloon Square 14x14 (£18.00). Chimney Balloon square 14 × 14 inch inflatable draught excluder on the listing.
Balloon for Chimney Medium 60x30cm (£18.60). Medium rectangle chimney balloon about 60 × 30 cm (24 × 12 in) on the title.
Chimney Sheep 8 Inch Round Wool (£21.00). Chimney Sheep 8 inch round wool chimney draught excluder on the listing — round flues.
Chimney Balloon Large 14x38 (£19.00). Chimney Balloon large 14 × 38 inch inflatable draught excluder on the listing.
Measure the flue
Measure the open width and depth where the blocker will sit. Inflatable balloons expand to press against the walls; wool sheep are cut to stated sizes.
If you still use the fireplace, remove any balloon or sheep before lighting.
Inflatable versus wool
Inflatable balloons pack small and come in many sizes. Wool Chimney Sheep are reusable fabric blockers without a pump.
Both aim to cut chimney draughts when the flue is unused.
What to look for in a chimney balloon
Size that matches your flue opening.
Inflatable balloon versus wool blocker.
Round versus rectangular shape.
A pump or inflation tube if required.
A warning tag so nobody lights a fire with it in place.
Ease of removal when you want the fire again.
How we chose these picks
We only included products that were in stock on Amazon UK with a single live buy-box price in pounds when we checked on 27 October 2026, read with a UK delivery address. We skipped listings showing low stock, no stock line or unclear details, and we avoided repeating products already featured in our other guides. Specs in the comparison table come from each product's Amazon UK listing, and a dash means the listing does not state that detail. Descriptions are based on what each listing says; we have not tested these products ourselves, and we have not used star ratings or review counts.
Prices were checked on Amazon UK on 27 October 2026 and can change at any time. Check the current price, details and delivery date on Amazon before you order.
Frequently asked questions
Are chimney balloons any good?
They can cut a noticeable cold draught from an unused chimney when sized correctly. They are not a substitute for proper chimney repairs or a fitted damper.
What are chimney balloons?
Inflatable bags or wool blockers placed in a flue to reduce downdraught into the room. You inflate or push them into place and remove them before using the fire.
Is inflatable chimney balloon good to buy?
Yes if your chimney is unused and you can measure the opening. Pick a size close to your flue and follow the maker’s inflation and removal advice.
