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Keys to correctly select your fireplace

In Lacunza, we have a vast network of distributors to keep us close wherever you may be. They will help you in your purchase to ensure you get the product you need for your home. In any case, certain aspects should be taken into account before contacting your closest distributor so that you know what you really want and need.


To obtain a satisfactory experience with your wood burning stove or fireplace, the first basic step is for it to be the right size and offer adequate power. If you've never had a wood burning stove or fireplace, it’s difficult to know the power you will need to heat your home. At Lacunza, we have you in mind. So, we have a Power Calculator that you can use to avoid making strange calculations or assumptions.

Ventilation and insulation

Air supply to your home or wood burning stove is important to ensure it works correctly. If your house if very well insulated or has mechanical ventilation systems or extractor hoods, there may be operational problems (exhaust blow-back, for example). In this case, we recommend that you choose a “sealed unit” that allows air supply required for combustion to be protected from the exterior, which will completely prevent such incidents. In Lacunza you will find a large number and variety of options.
Insulation is another factor to keep in mind. If your home is not well insulated, it will require more heat. In any case, if your home has good insulation it will require an exterior air supply.


An incorrectly sized exhaust vent is the reason behind malfunctioning in many homes or wood burning stoves. You can consult this subject in the installation manuals, but it can be summarised as follows:

  • Follow the machine’s exhaust diameter.
  • Use adequate ducts (solid fuels)
  • Straight ducts or maximum 45º elbows (nothing at 90º)
  • They must surpass the roof’s height by 1 metre
  • Line working fireplaces (brick, stone, refractory...)

Where do I put it?

You probably know where you want to put your wood burning stove or fireplace but it’s not always the recommended place. You should take the surrounding materials into consideration, for example, close by materials that are sensitive to heat. In the instruction manuals, we explain safety distances to avoid problems. In addition, our distributor will be able to give you further information that you need on this topic.


In Spain, it is common for people to ask an acquaintance or family member to install a wood burning stove, ignoring the fact that poor installation is the reason behind most problems that come up later on. For that reason, Lacunza recommends that you hire a professional recommended by our distributor to perform the complete installation.

Change out an old one

If, on the other hand, you already have a wood burning stove or fireplace and you don’t know how to change it out for a new Lacunza, take a photo and some measurements of your old unit to one of our distributors and they will assist you in assessing the price to make the switch.

What do I have to know to get it right with a wood burning stove?

When buying a wood burning stove sometimes you may not know what some of the information means and this can lead to the wrong product being purchased. For example, you may choose the wrong power and end up overheating your house or generating more energy consumption through the stove than necessary. If you buy a wood stove with very high power, it will consume more wood than necessary. If, on the contrary, the power is not enough the wood stove would have to work at its maximum capacity for a long time.

Power output

The market for wood burning stoves offers many power output levels. Domestic installations are usually less than 70kW, but the correct choice will depend on the use you are going to give to your stove.
The power range of domestic boilers is usually 4kW and up. As a guideline, you can calculate that 1kW can heat approximately 10 square meters. So, a house of about 100 square meters would need a 10kW wood stove. But there are more variables that influence the decision regarding power output such as your home’s insulation, the area in which you live, etc.

Insulation level

The level of insulation directly influences the power needed to heat your home. Bad insulation due to the façade, partitions, windows etc. will make you need more power since some of the heat leaves your home through there. The area where your house is located will also exercise influence. Owing to this, estimates of power output must also take this factor into account.

Energy efficiency

Energy efficiency means that no energy is lost from the heat produced through combustion, making the wood stove that much more efficient. The higher the efficiency of the stove (a 70-85% yield is usually obtained), the greater the use of heat there will be, meaning your appliance is not only more efficient but provides you savings.


We’re here to help you
Do you have any doubts? Do you have a technical question or require assistance?
AEFECC is the only association that brings together manufacturers, importers and suppliers of wood burning stoves, fireplaces, cook stoves, boilers and, in general, wood burning and biomass appliances in Spain.
Combustion occurs within a closed chamber, acquiring the necessary oxygen from the outside without altering the oxygen in the fireplace.
Atmospheric power
Heat transferred to the atmosphere.
Axial fan
This is a type of fan where both the motor and the blades are mounted directly on the shaft. When the shaft and blades rotate, it produces a current parallel to the shaft.
CE Power
Average power available from the device, certified in official laboratories.
Centrifugal Turbine
A centrifugal tangential fan in which air is driven by a turbine or impeller, sucking it through the centre, expelling it through its blades parallel to its axis and exiting in a perpendicular direction to achieve greater pressure / speed with less sound.
Cleaning Access
Easy access to remove soot through a hatch (patented) Easy manual disassembly of the baffles, no tools required.
Cleanout door
They are usually cast doors without glass. They are totally opaque.
Closed stove
Completed constructed modular wood burning cook stove ready for installation.
CO emissions

A value that measures emissions of carbon monoxide, an odourless, colourless, tasteless, toxic and highly flammable gas.

Conto Térmico
An Italian regulation that encourages interventions to increase energy efficiency and thermal energy production from renewable sources for small installations.
It is called convection when heat is transmitted and creates natural air circulation in any room.
Rotating cover that allows the passage of air/smoke through a pipe to be opened/closed
A device used to divert the direction of the smoke flow before leaving the duct
Double Combustion
Technology whereby the gas from the firewood’s initial combustion is burned again. It provides greater efficiency and life for your firewood with lower consumption.
Double sided
These are fireplaces or wood burning stoves that have glass on the front and back of the fireplace in order to see the fire and get heat from both sides.
Channelling of air through ducts
Easy Fire Control
Fire control system that can regulate the optimal combustion and cleaning of the firewood appliance with one simple remote control device.
Easy To Clean
Surface treatment of the wood burning cook stoves with a high-quality enamel. Makes cleaning easy with as little as a damp cloth.
Ecodesign 2022
A European regulation (compliance with which is mandatory starting in 2022) that will require greater energy efficiency in all products and lower emissions of CO, OGC, NOx and other types of hitherto uncontrolled pollutant gases.

A European certification related to energy consumption. It grades the product based on strict sustainable criteria defined at European level and ensures that the purchased product meets the maximum sustainability requirements

Energy efficiency
This consists in the efficient use of energy. We refer to an efficient wood burning appliance when it consumes less energy than the average energy required to make it work.
Eolo System
High pressure ventilation system with centrifugal turbines and speed regulator (switchboard) to allow different rooms of the home to be heated through ducts.
External Air Inlet
Connectible system that takes air from outside the house for combustion. Suitable for low consumption housing.
Extra Clean Glass
Novel air intake system on the glass to keep it clean for longer.

An instrument or apparatus with rotating blades that drives or removes air.

Flamme Verte
Flamme Verte is a quality label for wood burning appliances in France. To obtain the Flamme Verte label, the energy and environmental performance of each device is controlled in laboratories, accredited against ISO / IEC 17025 and notified by the European Commission, whose tests give access to the CE certification.
Flow Driving
Hot air bypass system with selectable outlet. It allows for longer ducts and makes it possible to close the air outlet. Includes a turbine control unit.
Guillotine opening
A sliding door opening that pulls up and can stay hidden
Entrance that provides access to clean the cook stove, wood burning stove or fireplace.
Heat ducting
Wood burning appliances with heat ducting are those that heat the room in which they are installed and also the adjoining rooms through a duct system that distributes the heat to different spaces.
Heatable area

The square metres heated by the wood burning stove, cook stove or fireplace.

Heatable volume

The cubic metres heated by the wood burning stove, cook stove or fireplace.

Cook stoves, wood burning stoves or fireplaces that heat water in a circuit to heat the entire house in a more even and balanced way
Also known as cassette fireplaces, they are an evolution of the classic open fireplace. Specially designed to be inserted into existing holes
Set of iron pieces used to decorate or reinforce the structure of a door or another object.
An appliance, in this case for firewood, that is embedded in the wall in a single piece.
Tubular opening where the air used for combustion in the wood-burning appliance enters in or travels out through ducts to other rooms
Perfect Combustion
Optimum burning technology allowing high combustion efficiency values to be achieved. Consumes less and makes loads of firewood last longer.
Device with which the wood burning appliance’s power can be controlled.
Power range

Minimum and maximum power of the wood burning appliance or the variance in power obtained from conditions of slow and maximum combustion.


This refers to some materials’ property of being resistant to high temperatures without decomposing or storing heat.

Retractable doors
Door opening system that slides completely flush with the wall, making the doors disappear.
Safety coil
A hollow, spirally wound tube used to cool the heating device’s tun (tank) in case of overheating.
Screen printed glass
This refers to glass with the imprint of something written or drawn on it.
Silent Mode
A system allowing turbines to be shut off to enjoy complete silence.
Smoke outlet

It is the part of a wood burning appliance through which the fumes are expelled.

Tangential fan
All fans in which air flow leaves its axis in a tangential direction.
Thermal discharge valve
A valve that prevents overheating in wood-burning appliances by letting cold water pass through it toward the safety coil

A material with a high capacity for storage and thermal transmission, besides its insulating properties. It is resistant to high temperatures and is an excellent heat accumulator. Great white finish.

Total heating power
Useful heat released by the device. It is the sum of the heat released to water and the atmosphere.
A tank containing the water to be heated by fire in boilers

A novel material with excellent insulation, high strength, aesthetics and lightness. In addition, LACUNZA vermiculite uses the appropriate density, thickness and dimension for each device. This customised design for each project allows for longer lasting fires, avoiding any type of problem. It is essentially a material composed of aluminium magnesium and iron silicate.

Water power

Average power released by a heating appliance (for water) to a heating system.

Workplace stove
Wood burning cook stove requiring on site assembly with heat-resistant materials such as refractory bricks.

Relationship between the power generated in the combustion chamber relative to the heat felt in the household.