Metalfire Avenue Gas Fire Tunnel
- See-through configuration - one fire, enjoyed from two rooms at once
- Two models: 900mm and 1050mm widths, 7.4-8.35kW, up to 86.1% efficiency
- Double Burner and Eco Wave - full flame or gentle ambience, up to 40% gas saving
- Frameless removable glass, RF remote with thermostat and timer; made to measure in Belgium
The Metalfire Avenue Gas Fire Tunnel is a closed, high-efficiency gas fireplace built to be seen from both sides - one fire shared between two rooms, or between a living space and a hallway. Made to measure in Belgium, it turns a dividing wall into the warmest part of the house, with a frameless glass panel on each side and nothing to interrupt the view of the flame. Two model sizes are available: the MF 900-60 GHE T and the MF 1050-40 GHE T.
Output runs from 7.4 to 8.35kW at up to 86.1% efficiency. Metalfire's Double Burner lets you run the inner burner alone for ambience at around half output, while Eco Wave modulates the flame automatically, saving up to 40% gas. The RF remote controls flame height, room temperature and timers, and the frameless glass lifts away without tools for cleaning. Natural gas as standard, with propane and biopropane compatibility, and tested for hydrogen blends up to 40%.
- Free delivery over £500
- 4.8 Google Reviews Score
- Expert Installation Available
What Makes The Metalfire Avenue Gas Fires Exceptional
Dual Burning
Two separate burners sit within the fire. Run the inner burner alone for a gentle flame at around half output - atmosphere without the heat - or bring the outer burner in for full depth, full flame and full warmth.
Eco Wave
The flame modulates between high and low on its own, moving like a real wood fire while using up to 40% less gas. Set it, and the fire does the rest.
H2
Ready for the future of gas. Every Avenue is tested on hydrogen blends up to 40% with no modification needed, so the fire is prepared as the UK gas grid changes.
Line Burner
A clean, linear flame running the full length of the fire with no visual interruption - fire as architecture, made for minimalist interiors where presence matters more than bulk.
Technical Specifications
Every dimension, every material choice, every specification has been considered. Built to exacting standards for those who demand excellence.
Decorative Burner Toppings for The Metalfire Avenue Gas Fire
Wood Chips
Dark, charred-wood chips for a rugged fire bed - the look of a fire that has been burning for hours.
Vermiculite
Fine mineral granules forming a clean, even bed that glows gently around the flame.
Grey Pebbles
Smooth grey stone for a calm, contemporary fire bed - the quiet option.
White Pebbles
Crisp white stone that brightens the fire bed and sets a sharp contrast against the flame.
Log Burner Finish
Smoke Style Ceramic Logs
Dark, charred ceramic logs with the look of a fire mid-burn - the contemporary choice, and the standard finish on 60cm-opening models.
Classic Style Ceramic Logs
Natural brown ceramic logs in the style of freshly laid firewood - the traditional fire-bed look.
TECHNICAL SPECIFICATIONS
The different Models available for the Metalfire Avenue Tunnel
MF 900-60 GHE T
MF 1050-40 GHE T
CHOOSE YOUR FINISH
One fire, three colours, five finishes
Select a colour to see the different finishes available
Standard Finish
Original Finish
Design Finish
Round Finish
Triangle Finish
Standard Finish
Original Finish
Design Finish
Round Finish
Triangle Finish
Standard Finish
Original Finish
Design Finish
Round Finish
Triangle FinishMetalfire Avenue Gas Fire Tunnel
A see-through closed gas fire that lets two rooms share one flame. Made to measure in Belgium, with high-efficiency burn, Double Burner control and an RF remote with thermostat and timer.
Watch the Metalfire Avenue Burn
Two Rooms, One Fire
The tunnel configuration opens the flame to both sides of a dividing wall. One fire, two rooms - and a view straight through the flames from either side.
A Full, Deep Flame
The Double Burner runs inner and outer burners together for a rich, full flame bed - or the inner burner alone for a quieter fire at half output.
Control From Either Room
The RF remote adjusts flame height, sets the room temperature and runs timers from wherever you are sitting. Eco Wave modulates the flame automatically to save gas.
Why Choose Marlow
Expert Consultation
Our specialists guide you through every step, from selection to installation.
Premium Collections
Curated selection of the finest fireplaces from leading manufacturers.
Trusted Installation
Certified professionals ensure safe, compliant installation every time.
Lifetime Support
We're here for you long after installation, with maintenance and warranty support.
Frequently Asked Questions
What is the Metalfire Avenue Gas Fire Tunnel?
A closed, high-efficiency gas fireplace with glass on two sides, built into a dividing wall so the flame is visible from two rooms at once. It is made to measure in Belgium by Metalfire, in two model sizes, with outputs from 7.4 to 8.35kW.
What is the difference between a tunnel gas fire and a front gas fire?
A front fire has glass on one side and sits against or within a wall; a tunnel fire has glass on both sides, so two rooms share the same flame. The Metalfire Avenue Tunnel turns the wall itself into the focal point of both spaces.
What models does the Metalfire Avenue Tunnel come in?
Two: the MF 900-60 GHE T, with a 900mm wide by 600mm high opening, and the MF 1050-40 GHE T, at 1050mm by 400mm. Both share the same burner technology, remote control and finish options.
How much heat does the Metalfire Avenue Tunnel produce?
Between 7.4 and 8.35kW depending on the model, at 84.0-86.1% efficiency - serious output for a gas fire, delivered as both radiant warmth through the glass and convected heat from the convection chamber fitted as standard.
Does a tunnel gas fire heat both rooms?
Yes - warmth radiates from the glass on both sides, and the built-in convection chamber circulates heated air. In practice it takes the chill off both spaces, with the room housing the flue connection typically feeling the most benefit.
What fuel does the Metalfire Avenue Tunnel use?
Natural gas (G20) as standard, with full compatibility for propane (G30) and biopropane. The burner is also tested on hydrogen blends up to 40%, so it is ready for the changing UK gas grid.
What flue does the Metalfire Avenue Tunnel need?
A concentric balanced flue system, which draws combustion air in and vents exhaust through the same assembly - no chimney required, though it can connect to one. Your installer will confirm the routing after a survey.
How do you control the Metalfire Avenue Tunnel?
With the RF remote control included: on and off, flame height, a room-temperature setpoint, a programmable timer, and Eco Wave modulation. The Double Burner function switches between 50% and 100% output.
How do you clean the glass on the Metalfire Avenue Tunnel?
The frameless glass panels lift away with the suction cups provided - no tools needed - so both sides can be cleaned quickly and refitted in minutes. An anti-reflective glass option is available for an even clearer view of the flame.
Who installs the Metalfire Avenue Tunnel gas fire?
Gas fires must be installed by a Gas Safe registered engineer. Our team installs within our local radius, handling survey, gas connection and commissioning; further afield we supply UK-wide and advise your installer. Call 01628 290142 to talk it through.
See the Metalfire Avenue Gas Fire in Action
Learn more about the Metalfire Avenue
Metalfire Avenue Smoke Style Ceramic Logs
Metalfire Avenue Decorative Chips
Metalfire Behind the Scenes
INSTALLED WITH PRIDE
Metalfire Avenue In homes like yours
TCC ArchitectenInstallation by Bosmans Haarden
Saai
Justine Lescouhier
Ramboux
Wendy VerstrepenInstallation by Roger Van Daele
Filip Tack
Julie Steurbaut
De Maatwerker
Alexander Ponaert
Steven Van Compernol
Sofie Delrue
Lefebvre Haarden
Studio LeemanInstallation by De Backer Haarden
Lefebvre HaardenWhy Choose the Metalfire Avenue Tunnel Gas Fire
The Tunnel is for interiors where a wall should not mean the end of the fire. See-through glass on both sides, made-to-measure Belgian construction, and efficiency up to 86.1% - the focal point of two rooms at once.
- SEE-THROUGH FIRE FOR TWO ROOMS
- UP TO 40% GAS SAVINGS WITH ECO WAVE
- MADE TO MEASURE
The Metalfire Avenue Gas Fire Collection
Front, Corner, 3-Sided and Tunnel
Experience Marlow In Person
Nothing compares to seeing our range of appliances up close and interacting with them as you would at home. Visit our Marlow showroom in Buckinghamshire, to go through your ideas and discuss your options.
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