Flueless Gas Fires

Buying a flueless gas fire is one of the best options if you’re looking for a modern addition to your home. For traditional and contemporary properties alike, a flueless gas fireplace is the perfect combination of practicality and style with no need for a chimney or flue system. Our clean burning designs with simple operation, it’s never been easier to install a flueless fireplace in your home. We offer a range of wall mounted flueless gas fires and recessed no flue gas fires so you can be sure we have the perfect design to fit your space, whether you want a freestanding gas fire with a bold design or purely practical solution for your home. By choosing one of our gas fires, you can be sure you’re buying a rigorously tested and safe ventless gas fire, beautifully designed by our team.

Flueless Gas Fires & Stoves UK

Traditional Style Flueless Gas Fires with Surrounds

Our flueless gas fires are a functional and highly efficient way to introduce another heat source into any of your living spaces. The lack of catalytic converters and flue systems make these fires a very aesthetically pleasing solution, combined with the functionality of our unique burner technology. Our 100% energy efficiency flueless gas fires make sure you can save as much on energy costs as possible without any heat escaping from the room. Our designs really make an impact when used as an inset gas fire or hole in the wall gas fire, giving a modern look to every home.


What are the benefits of a Flueless Gas Fire?

  • Easy to Install and Use.
  • No Chimney.
  • 100% Energy Efficient (no heat wasted)
  • Low Running Costs (70% cheaper than electric, wood & bio-ethanol)
  • Perfect solution for instant secondary heat for a living room or lounge.

Flueless means that neither chimneys nor flue pipes are required to operate the fire; all emissions come from the fire vent on the top or front of the fire. As our flueless fires burn very cleanly, you don’t need to install a flue or chimney. Balanced flue fires, however, require flue pipes up and out of your wall for safe operation – this makes them not flueless, and more costly to install.

We’re the only manufacturer who can offer living flame gas fires without the need for a glass screen that drives emissions through a catalytic converter. As our range of flueless gas fires are clean burning we don’t need either to allow for safe operation.

  • Energy Efficiency: All of the gas you burn in one of our flueless gas fires is converted to heat and returned to the room, making sure you’re not wasting any money.
  • Saving Money: Despite all the hype in the media, gas is the cheapest form of energy to use – over 70% cheaper “per kw/h” of heat than wood, electric or bio-ethanol.
  • Easy to Install: Our fires can be installed quickly and easily if the gas supply is nearby.
  • Easy to Use: Using the control knob on our fires you can easily adjust the flame size and heat output to suit you.
  • Extra Heat when you want it: Flueless stoves are ideal as a secondary heat source for your home; one of our flueless gas fires will give you between 2.0kw and 3.5kw of heat and will cost you only 9p to 15p per hour to run. For the same amount of heat output, an electric fire can cost anywhere between 30p and 53p.

The flueless gas fires we manufacture have unique features that other companies don’t offer : Our open flame fires no glass or catalytic filters, meaning that the air circulating from our fire radiates out from the front and the top. We’ve manufactured our own unique style of open flame flueless gas fires since 2003, and since then we’ve won many style and technology awards, with our fires appearing on many TV programs. To date, there are CVO flueless gas fires installed in homes and commercial properties across Europe. At CVO Fire we specialise in manufacturing flueless gas fires with a beautiful open flame.

If you ask the same gas fitter if they’d fit a gas cooker for you, they’ll say yes! That’s despite the fact that gas cooker have no safety devices fitted, and are more dangerous than a flueless gas fire. Both gas cookers and flueless gas fires have a flame – so how can one be safe when fitted but not the other? Unfortunately there are a lot of gas fitters who don’t have a clue about the appliances they’re supposed to fit in homes. This is why we’ll happily give you the name of a proper gas fitter who can help you with safe installation.

All flueless gas fires sold in the EU have an ODS pilot system. This is a safety device which will shut off the gas to the main burner if there’s a problem. The CE standard says this must operate if the CO in the room reaches a maximum of 80ppm – our fires shut off at around 25ppm. When you consider a smoker has over 100ppm in their breath, you can see how small and sensitive this measurement is. If a fire is installed in a room smaller than the minimum in conjunction with the wrong (or blocked) air vent, it will shutdown approximately 1 hour or so after being started. This can sometimes lead people to think the fire is faulty, but it’s actually indicating an installation fault. Another indication of an installation fault is that the fire stops temporarily, and later works perfectly again. In this case you shouldn’t use the fire and get a gas engineer to check the complete installation against the manufacturers instructions.

Flueless Gas Fires have an outstanding safety record because they’re designed to burn incredibly cleanly. Most manufacturers use filters or catalytic converters to clean out the emissions, but our unique clean burner technology has taken the next step forward, no longer requiring a filter or other device. 

A CVO Flueless Fireline was installed in a Central London Restaurant in December 2003 and worked continuously until the restaurant closed in May 2007. This fire typically operated for 15hrs/day, 6 days a week for 41 months, totalling 14,760 hours. This is equivalent to nearly 25 years of operation in a domestic property – we pride ourselves on manufacturing very reliable flueless gas fires!

Flueless gas fires have only recently been introduced in the United Kingdom, but has been readily sold in countries such as Australia, Japan, and the USA for many years. It’s so successful in these countries that it now outsells conventional chimney appliances.

A flueless gas stove can be used to heat areas or rooms in which other forms of heating would be difficult or expensive to install – these include basements, room extensions and conservatories. It’s worth noting, however, that there must be a primary heat source in the room already. Inset flueless gas fires can be installed almost anywhere, even on an inside wall, allowing for a flexible solution regardless of your situation.

A flueless gas fire works in the opposite way to a conventional gas fire, as the heat is distributed gently throughout the property. The vent supplies air into the room which is being heated. This then circulates throughout the property, giving additional warmth.

A myth created by people who don’t understand the technology is that a flueless gas fire will cause condensation in your house. This is untrue. Our no flue fires are a secondary heat source, working with your central heating system. The background air temperature prevents most of the moisture from condensing, and it’s dispersed by normal air movement.

It means “parts per million”. During the CE tests this is measured at the outlet of the appliance in a very concentrated sample, direct from the burner. Once this has been diluted by the oxygen in the room the CO concentration is tiny and very safe.

All modern flueless gas fires manufactured and sold in the EU have an ODS pilot system fitted. This special part monitors the oxygen levels in the room. If the air vent is blocked, the ODS will shut off the fire long before there’s an issue over the emissions. For instance, our fire shuts down at only 25ppm, the CE maximum is 80ppm and it’s reported that exposure to CO levels of 800ppm and higher are considered hazardous. Most CO alarms go off at 36ppm to 99ppm when sampling the concentration in the room. This means your CVO flueless gas fire will switch off before the CO alarm even goes off.

  1. Air Vent. This will allow a trickle of fresh air into the room. A common misconception is that people think it takes air (and heat) from the room, but this isn’t the case. The vent only supplies a tiny amount of fresh air, and doesn’t deduct from the heat in the room. Modern air vents include baffles and cowls to prevent any drafts. We can supply a modern air vent with your gas fire purchase.
  2. Gas Supply. The gas pressure must be maintained at the manufacturers stated level or the combustion will change.
  3. Room Size. There will be a specified “minimum” room size. The room can be bigger than this, but not smaller. The minimum room size is calculated as the height x depth x width in meters – giving a m3 result. You should also make an allowance for the amount of furniture in the room.

Our fires are all handmade in the UK using locally sourced materials. Every fire is individually handmade and tested for up to 1 hour before being packed and shipped. Our fires don’t need catalytic converters or glass on the front, leaving a beautiful open living flame.

Flueless gas fires are very safe. About 20 million are installed in the USA and they can be found in Australia and Japan – two countries with strict environmental laws. The emissions from these appliances are very small, and also require an air vent in the room. This vent provides fresh oxygen to replace the oxygen burnt by the fire and keep the air fresh. You should also consider that as a manufacturer our factory is inspected each year by officials from CE to ensure we are making products to the exact standards set out by EU law. Additionally, every month we do our own internal audit on our appliances and we also test the components when they arrive at the factory and before we build the fires. This is what makes our fires the safest and most reliable on the market. All of our fires are also fitted with safety devices. This will shut the fire off if someone tampers with it or the air quality is reduced. Our fires shut down at only 25ppm and it’s reported that exposure to CO of levels of 800ppm and higher are considered hazardous, making our fires some of the safest on the market.

The emissions from a wood burning appliance are much higher than a flueless gas fire, as they can be up to 50x greater. If they’re installed with a faulty flue system or the door seal is damaged these emissions can also come into the room. Wood burners don’t have an ODS system, hence why it’s law to have a CO monitor with a wood burner.

Our flueless fireplaces burn oxygen from the room to ensure that the flame is clean. As the fire uses a small quantity of the air from within the room, this must be replaced by fresh air supplied by the wall vent from outside. If the air vent is the wrong size and does not supply enough air or becomes blocked all together, after a period of time the volume of used air will reach a level where the pilot will operate to shut the fire off. This is normally shown by an increase in noise from the pilot. This is why every fire has a minimum room size and a minimum specified volume of “free air” that must be supplied in to the room. We supply high quality vents for around £40 that ensure you don’t get drafts, just a trickle of fresh air but enough to operate your fire. You must never block the vent, otherwise the safety device will kick in and shut the fire down.

Without catalytic convertors and glass screen, the emissions from our flueless gas fires are diluted quicker by the fresh air. With other brands of flueless fire, the vent on top of the appliance can concentrate the heat into one fixed outlet area, causing stains on the wall directly above the fire – an issue you won’t face with one of our fires.

When replacing a conventional or balanced flue gas fire with a flueless gas fire you will lower your overall gas bills by up to 70%. The annual cost of using a flueless gas fire is around £50/year, compared to an electric fire of £150/year or burning wood at £500/year for the same heat. When considering other appliances, with safety in mind, you should also consider that the emissions from a wood burning fire are very high and don’t have a safety device to shut them down. The dust particles have also been proven to be very hazardous. Wood burning fires may seem glamorous, but when considering your family’s health, you should carefully research the health hazards of burning wood first.

If installed correctly with an air vent in the room, and operated as instructed, then our fires will not cause a smell. As described above, our flueless gas fires use fresh air from the room. If the air quality is poor then this poor quality air will be drawn into the fire and burned, causing a smell. Whenever the cause of smells has been investigated it hasn’t been the fire at fault, but by people doing something to the air quality or changes in the home. Common examples of this include burning scented candles, using air fresheners, decorating, new furniture, spraying aerosols, laying new carpets and more.

The energy efficiency of a flueless gas fire is 100%. This is partly because there’s no flue or chimney through which heat can escape, meaning that all the heat can remain in the room. As a result, running costs are very low and are often a considerable saving over different energy types. A conventional chimney or flue set up draws a large amount of air from the house which can cause central heating systems to be far less efficient. With one of our ventless fires this doesn’t happen, so your heating systems can work efficiently with each other.

Flueless gas fires are designed to be wall mounted. Mounting anything above the fire must be done in line with CE approval. The fires that we sell are approved with a special deflector which allows a shelf above, however this must be done in line with the installation booklet. This deflector must be ordered at the time of ordering the fire, but we’re always on hand if you need more details!

Our flueless gas fires are designed to be wall mounted, although we also have a recessed version if preferred, allowing for different placements and design choices. Please ask if you need any more details!