# MI Fires Tinderbox Medium Wood Burning Ecodesign Stove

A highly efficient, UK-designed wood-burning stove built to deliver dependable 5kW warmth with excellent fuel efficiency and low emissions. The MI Fires Medium Tinderbox combines an impressive 85.1% efficiency rating with a clear flame view and compact proportions – ideal for homeowners who want clean, comfortable heating for everyday living.

## Why Choose This Model?

The Medium Tinderbox is an excellent choice if you want strong heating performance with outstanding efficiency. Its 5kW output makes it well suited to small and medium-sized living spaces, while its 85.1% efficiency and A+ energy rating help make effective use of every log. With Ecodesign compliance, DEFRA approval and low emissions, it offers a practical combination of traditional wood-burning warmth and modern clean-burning performance.

## What’s Included

-   MI Fires Medium Tinderbox wood-burning stove
-   Ash pan
-   Operating and installation manual

### Key Features

-   **5kW heat output** – ideal for small to medium-sized living spaces.
-   **Wood-burning design** – specifically designed for efficient burning of wood logs.
-   **Ecodesign 2022 compliant** – meets modern efficiency and emissions requirements.
-   **Smoke Control Area exempt (DEFRA approved)** – suitable for use in designated Smoke Control Areas.
-   **85.1% efficiency** – delivers excellent heat while making highly efficient use of fuel.
-   **A+ energy rating** – excellent energy performance for everyday home heating.
-   **Low dust emissions** – tested at just 13mg/m³ at 13% O₂ for clean combustion.
-   **Steel body with cast iron door** – durable construction designed for regular use.
-   **Airwash system** – helps keep the viewing glass clearer for a better view of the flames.
-   **Large viewing window** – provides a clear and attractive flame picture.
-   **External air compatible** – suitable for installations where an external air supply is required.
-   **Designed and engineered in the UK** – developed with a focus on efficient combustion and reliable everyday performance.

### Technical Highlights

-   Rated heat output: 5kW
-   Efficiency: 85.1%
-   Energy rating: A+
-   Weight: 64kg
-   CO emissions at 13% O₂: 0.08%
-   Mean flue gas temperature: 218°C
-   Dust emissions at 13% O₂: 13mg/m³
-   CnHm emissions at 13% O₂: 70mg/m³
-   NOx emissions at 13% O₂: 98mg/m³
-   Fuel type: Wood only
-   Construction: Steel body with cast iron door
-   Ecodesign 2022: Yes
-   DEFRA Approved: Yes

### Specifications

Guarantee

2 Years

Efficiency

85.1%

Heat Output

5kW

Nox Emissions at 13% O2

98 Nmg/m³

Energy Rating

A Plus

DEFRA Approved

Yes

Airwash System

Yes

Construction

Steel Body - Cast Door

Flue Outlet

Top & Rear (Interchangeable)

Flue Size

5-inch (125mm)

Fuel Type

Wood Only

Fuel Grate Type

Wood Burning Only

Log Length

250mm

Suitable For 12mm Hearth

Yes

External Air Compatible

Yes

Distance to Combustibles - Sides

400mm

Distance to Combustibles - Rear

250mm

Product Range

Tinderbox

Sweep Flue through Stove?

Yes

Colour

Black

More Colours

No

Colour Options

Blacks

Finish

Matt

### Product Sizes

![](https://cdn.shopify.com/s/files/1/1029/2396/0650/files/mi_fires_tinderbox_medium_wood_burning_ecodesign_stove_dimensions_2.webp?v=1787908501)

Overall Width

410mm

Overall Height

573mm

Overall Depth

352mm

Rear to Centre of Top Flue (F)

124.5mm

Width to Centre of Top Flue (E)

205mm

Depth to Centre Flue (D)

227.5mm

Weight

64kg

### Installation Guide

[Click here to view installation guide.](https://cdn.shopify.com/s/files/1/1029/2396/0650/files/mi_fires_install_tbox_lb.pdf?v=1788343142 "Install Guide")

### Liner Kit (Optional)  
  

![](https://cdn.shopify.com/s/files/1/1029/2396/0650/files/LINER_KIT.png?v=1788437904)

**Liner Kit Includes**

-   10m 316-grade flue liner
-   Pot hanging cowl
-   Liner adaptor
-   500mm vitreous stove pipe
-   Register plate
-   Carbon monoxide (CO) alarm
-   Data plate

## Details

- **Price:** 687.06 GBP - 927.06 GBP
- **Vendor:** Mi Fires
- **Type:** wood stove

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| No | 687.06 GBP | In stock |
| Yes | 927.06 GBP | In stock |

## Images

- MI Fires Tinderbox Medium Wood Burning Ecodesign Stove
- MI Fires Tinderbox Medium Wood Burning Ecodesign Stove
- MI Fires Tinderbox Medium Wood Burning Ecodesign Stove
- MI Fires Tinderbox Medium Wood Burning Ecodesign Stove
- MI Fires Tinderbox Medium Wood Burning Ecodesign Stove

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> Source: [Pro-Line Direct](https://prolinedirect.co.uk/products/tinderbox-medium-wood-burning-ecodesign-stove)
> Updated: 2026-09-07