EcoSmart Fire
EcoSmart Fire Flex 104SS Fireplace Insert
EcoSmart Fire Flex 104SS Fireplace Insert
In stock
Twin burners even in single-log-box configurations
Free UK Delivery
- Up to 30,580 BTU/h (twin XL1200) Ethanol Burners
🚚 Estimated Delivery Date:
Delivery date to be confirmed via email once order is placed
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Buying with confidence
- Manufacturer warranty: 2 years on the bioethanol burner and stainless steel parts, 1 year on everything else.
- 45 day returns. Unused and in its original packaging.
- Damaged on arrival? Check it before you sign, and tell us as soon as you can, ideally within 48 hours, so we can sort a replacement quickly. This does not affect your statutory rights.
- Free UK mainland delivery.
- Not sure it is the right one? Call, email or chat with us before you order.
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Overview:
- The Flex 104SS widens to 2850mm and is the first size in the Flex range where even a single log box still needs two burners to fill the remaining run, only removing both sides brings it back to one.
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Design & Build:
- Zinc-sealed mild steel surround and toughened glass, built around twin Grade 304 stainless XL1200 burners in All Flame form (30,580 BTU/h combined from a 20-litre tank); Log Box Left/Right still run twin XL900 burners, and only Log Boxes Both Sides steps down to a single XL1200. The burner is available in Stainless Steel as standard, or a Black ceramic-coated finish for a flat, monochrome look, at a fixed premium.
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What it does well:
- All Flame runs 9 to 14 hours per fill, the longest single-fill runtime available at this width, and is rated for a 230m³ room. Because Log Box Left and Log Box Right both keep twin burners, choosing a single log box costs comparatively little heat output against All Flame.
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Trade-off worth knowing:
- At 2850mm and up to 146kg, this is a serious architectural installation, not a drop-in upgrade. If that scale is more than the room needs, the 86SS delivers a similar twin-burner All Flame experience in a noticeably narrower, lighter unit.
Flex 104SS questions, answered
Does the Flex 104SS need a chimney or flue?
No. It runs on bioethanol, which burns clean with no smoke, embers or soot, so there is nothing to vent. It frames into a wall or opening with zero clearance to combustibles - no masonry chimney, gas line or flue required.
Can the Flex 104SS be used both indoors and outdoors?
Yes, it is rated for both. Indoors it needs a room of at least 230m³.
How is the Flex 104SS installed?
It frames directly into a stud wall (wood or metal) or an existing hearth opening, with zero clearance to combustibles required around the frame. There is no gas line, flue or masonry work: once the opening is framed to size, the unit drops in and connects to nothing else. At 146kg (All Flame) it is a two to four-person lift into place depending on the model; check the exact figure on this page before planning your install.
What does the Flex 104SS actually cost to run for an evening?
A full 20 litre fill burns for 9-14 hours. We sell e-NRG bioethanol at £65 for a 20 litre carton, so a full fill is about £65 and a three-hour evening works out at roughly £14 to £22. There is no standing cost, since it only uses fuel while it is alight.
Which Flex size should I choose?
At 104SS, even a single log box still needs two burners to fill the remaining run - only removing both sides brings it back to one. If that scale is more than the room needs, the 86SS delivers a similar twin-burner All Flame experience in a noticeably narrower, lighter unit.
Which fuel does the Flex 104SS burn, and do you sell it?
It runs on e-NRG bioethanol, which we stock in 20 litre cartons. Bioethanol produces no smoke, embers or ash, so there is nothing to clean out after use.
Are there any accessories that fit the Flex 104SS?
Yes. Its twin XL1200 burner takes the XL Baffles and Black Glass Charcoal, sold separately.
Is the Flex 104SS certified for indoor use?
Yes. This model is certified to EN 16647, the UK and EU safety standard for indoor bioethanol fireplaces.
Who the Flex 104SS is for
It is a good fit if:
- You want the longest single-fill runtime available at this width (9-14 hours) and a 230m³ rating.
- Choosing a single log box costs comparatively little heat output against All Flame, since both keep twin burners.
Consider something else if:
- That scale is more than the room needs: the Flex 86SS delivers a similar twin-burner All Flame experience in a noticeably narrower, lighter unit.
| Model | Burner | Pick it for | Opening width | Price | Weight |
|---|---|---|---|---|---|
| Flex 18SS | AB3 | Narrowest, fits a tight wall recess or stairwell | 578mm | £1,495 to £1,795 | 25.7kg |
| Flex 32SS | XL500 | First step up to the XL burner family, nearly double the heat | 1010mm | £2,995 to £3,445 | 45.7kg |
| Flex 42SS | XL700 | Shares its burner with the wider 60SS, no log box required | 1265mm | £3,695 to £4,145 | 60kg |
| Flex 50SS | XL900 | First size offering an integrated log-storage configuration | 1470mm | £4,095 to £4,595 | 71.4kg (All Flame) |
| Flex 60SS | XL700 | Log box standard, no All Flame option at this size | 1725mm | £4,545 to £5,095 | 83.9kg |
| Flex 68SS | XL1200 | Largest single-burner size, four configurations at one price | 1930mm | £4,795 to £5,295 | 97.1kg (All Flame) |
| Flex 78SS | XL700 | Log boxes on both sides as standard, no All Flame at this size | 2186mm | £4,795 to £5,245 | 108kg |
| Flex 86SS | twin XL900 | First size to need twin burners for full-width All Flame | 2390mm | £6,995 to £7,995 | 122kg (All Flame) |
| Flex 104SS (this one) | twin XL1200 | Even a single log box still runs twin burners | 2850mm | £7,995 to £8,995 | 146kg (All Flame) |
| Flex 122SS | triple XL900 | First size to run three burners across All Flame | 3310mm | £9,995 to £11,495 | 172kg (All Flame) |
| Flex 140SS | triple XL900 | Every configuration carries at least one log box | 3770mm | £11,395 to £12,895 | 195kg (single log box) |
| Flex 158SS | triple XL1200 | Largest and widest in the launch, two configurations only | 4230mm | £12,395 to £13,895 | 222kg (All Flame) |
Prices are current at the time of writing; follow any link for that model's live price.
Delivery Information
Delivery Information
Key Points of Interest
Key Points of Interest
Specifications
Specifications
| Category | Details |
|---|---|
| Material | Mild Steel (Zinc Sealed, High-Temp Powder Coat) Surround, Toughened Glass; Grade 304 Stainless Steel Burner |
| Weight | 146kg (All Flame), 144-145kg (log-box configurations) |
| Dimensions (W x D x H) | 2850mm x 365mm x 807mm |
| Surround colour | Black |
| Burner finish | Stainless Steel (standard) or Black ceramic-coated (+£1,000) |
| Fuel | Bioethanol only (Indoor or Outdoor) |
| Thermal output | 30,580 BTU/h (32.26 MJ/h) |
| Burn time | 9-14 hours per fill |
| Fuel capacity | 20 litres |
| Minimum room size (indoor use) | 230m³ |
| Burner compliance | EN 16647 compliant burner (manufacturer-approved) |
| Configuration options | All Flame chains two XL1200 burners (30,580 BTU/h, 20L, rated to 230m³). Log Box – Left/Right still need two burners each (XL900 x2, 30,000 BTU/h, 18L, 220m³) — even one box removed still leaves too wide a run for a single burner. Log Boxes – Both Sides narrows enough for a single XL1200 (15,290 BTU/h, 10L, 115m³). All four configurations are the same price. |
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