Credit: Studio Leeman Installation by De Backer-haarden
Metalfire Avenue Gas Fire Three Sided
- Three-sided frameless glass - a panoramic view of the flame from across the room
- 10 model sizes from 800 to 1600mm wide, including the broader Extended format
- 7.0-9.5kW output, up to 87% efficiency; Double Burner and Eco Wave
- RF remote with thermostat and timer; made to measure in Belgium
The Metalfire Avenue Gas Fire 3-Sided is the most open fire in the range: frameless glass on the front and both ends, giving a panoramic view of the flame that works as a peninsula or island centrepiece. It is made to measure in Belgium, in 10 model sizes from 800 to 1600mm wide - including the 3-Sided Extended, a broader firebox format for an even wider flame view on the largest settings.
Output runs from 7.0 to 9.5kW at efficiencies up to 87%. 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
The finishing touch for the fire bed. Four decorative toppings dress the burner to suit the room - each changes the character of the fire, and all are interchangeable.
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 Three-Sided
MF 800-75 GHE 3S
MF 900-60 GHE 3S
MF 1050-40 GHE 3S
MF 1050-60 GHE 3S
MF 1050-75 GHE 3S
MF 1300-40 GHE 3S
MF 1300-60 GHE 3S
MF 1600-40 GHE 3S
MF 900-60 GHE 3S EXT
MF 1050-40 GHE 3S EXT
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 3-Sided
A panoramic closed gas fire with frameless glass on three sides - 10 made-to-measure sizes including the broader Extended format. Double Burner control, Eco Wave gas saving, RF remote.
Watch the Metalfire Avenue
The Panoramic Fire
Glass on the front and both ends gives an uninterrupted view of the flame from almost anywhere in the room - with the Extended format broadening the view further on the largest models.
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.
Effortless Control
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 3-Sided?
A closed, high-efficiency gas fireplace with frameless glass on the front and both ends - a panoramic view of the flame, made to measure in Belgium. It comes in 10 model sizes with outputs from 7.0 to 9.5kW, including the broader 3-Sided Extended format.
What is the difference between the Metalfire Avenue 3-Sided and the 3-Sided Extended?
Size and firebox format. The standard 3-Sided runs across eight model sizes; the 3-Sided Extended adds a broader, extended firebox in two sizes (MF 900-60 and MF 1050-40 3S EXT) for an even wider flame view. Both are closed gas fires, made to measure in Belgium, sharing the same burner technology and controls.
What sizes does the Metalfire Avenue 3-Sided come in?
Ten model sizes in total, from an 800mm-wide opening up to 1600mm, with opening heights of 400, 600 or 750mm - plus the two Extended models, MF 900-60 3S EXT and MF 1050-40 3S EXT, for a broader firebox. Your installer will help match the size to the setting.
What is the difference between a 3-sided and a tunnel gas fire?
A 3-sided fire has glass on the front and both ends - one firebox, viewed from three directions in the same space, often as a peninsula. A tunnel fire has glass on two opposite faces, viewed from two different rooms through a dividing wall.
How much heat does the Metalfire Avenue 3-Sided produce?
Between 7.0 and 9.5kW depending on the model, at efficiencies of 82.0-87.0% - radiant warmth through three glass faces plus convected heat from the convection chamber fitted as standard.
Where can a 3-sided gas fire be installed?
As a peninsula at the end of a wall, or as an island centrepiece in open-plan space - anywhere a concentric balanced flue can be routed. Because the fire is closed and glass-fronted, it is safe and efficient even in busy family rooms.
What fuel does the Metalfire Avenue 3-Sided 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%, ready for the changing UK gas grid.
What flue does the Metalfire Avenue 3-Sided need?
A concentric balanced flue system, which draws combustion air in and vents exhaust through the same assembly - no existing chimney is required. Your installer confirms the routing after a survey.
How do you control the Metalfire Avenue 3-Sided?
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.
Who installs the Metalfire Avenue 3-Sided 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 3-Sided Gas Fire
The 3-Sided is for rooms where the fire is the centrepiece from every angle. Panoramic frameless glass, ten made-to-measure sizes including the Extended format, and efficiency up to 87% - Belgian engineering at its most open.
- PANORAMIC VIEW FROM THREE SIDES
- UP TO 40% GAS SAVINGS WITH ECO WAVE
- MADE TO MEASURE
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.
Saturday: 10am—3pm
