EcoSmart Fire
EcoSmart Fire Flex 140SS Fireplace Insert
EcoSmart Fire Flex 140SS Fireplace Insert
In stock
Triple-burner output even with a single log box fitted
Free UK Delivery
- Up to 45,000 BTU/h (triple XL900) 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 140SS is one of three sizes in the Flex range, alongside the 60SS and 78SS, that ship without a full-width All Flame option, there is no way to get all 3770mm as unbroken flame at this size.
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Design & Build:
- Zinc-sealed mild steel surround and toughened glass, built around triple Grade 304 stainless XL900 burners for a single log box (left or right), stepping down to twin XL1200 burners when boxes sit on both sides. 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:
- A single log-box configuration runs 8 to 13 hours per fill on 45,000 BTU/h and is rated for a 330m³ room, matching the smaller 122SS All Flame's own output despite losing part of the opening to storage. Log boxes on both sides trade some of that output for storage on both ends.
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Trade-off worth knowing:
- Because every 140SS carries at least one log box, you cannot get an unbroken 3770mm flame band at this size the way All Flame does on the 122SS or 158SS either side of it. If that matters more than the log storage, one of those sizes suits the brief better.
Flex 140SS questions, answered
Does the Flex 140SS 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 140SS be used both indoors and outdoors?
Yes, it is rated for both. Indoors it needs a room of at least 330m³.
How is the Flex 140SS 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 195kg (single log box) 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 140SS actually cost to run for an evening?
A full 27 litre fill burns for 8-13 hours. We sell e-NRG bioethanol at £65 for a 20 litre carton, so a full fill is about £88 and a three-hour evening works out at roughly £20 to £33. There is no standing cost, since it only uses fuel while it is alight.
Which Flex size should I choose?
The 140SS is the second size in the launch, after the 60SS, that ships exclusively with an integrated log-storage box - there is no full-width All Flame option at 3770mm wide. If an unbroken flame band matters more, the 122SS or 158SS either side of it offer that.
Which fuel does the Flex 140SS 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 140SS?
Yes. Its triple XL900 burner takes the XL Baffles and Black Glass Charcoal, sold separately.
Is the Flex 140SS 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 140SS is for
It is a good fit if:
- A single log-box configuration matches the smaller 122SS All Flame's own output (45,000 BTU/h) despite losing part of the opening to storage.
- You want genuine log storage built into a very large-scale wall.
Consider something else if:
- You want an unbroken 3770mm flame band: every 140SS carries at least one log box. The Flex 122SS or 158SS either side offer an All Flame option instead.
| 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 | 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 (this one) | 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 | 195kg (single log box), 194kg (log boxes both sides) |
| Dimensions (W x D x H) | 3770mm x 365mm x 807mm |
| Surround colour | Black |
| Burner finish | Stainless Steel (standard) or Black ceramic-coated (+£1,500) |
| Fuel | Bioethanol only (Indoor or Outdoor) |
| Thermal output | 45,000 BTU/h (47.48 MJ/h) |
| Burn time | 8-13 hours per fill |
| Fuel capacity | 27 litres |
| Minimum room size (indoor use) | 330m³ |
| Burner compliance | EN 16647 compliant burner (manufacturer-approved) |
| Configuration options | Every Flex 140SS ships with at least one log-storage box — there is no full-width All Flame configuration at this size, the same pattern as the 60SS. Log Box – Left/Right run triple XL900 burners (45,000 BTU/h, 27L, 330m³); Log Boxes – Both Sides steps down to twin XL1200 (30,580 BTU/h, 20L, 230m³). All three configurations are the same price. |
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