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Gas oven

The oven is one of the equipment with the greatest presence in Portuguese kitchens. According to the Survey on Energy Consumption in the Domestic Sector 2010 (“ICESD 2010”) conducted by the General Directorate of Energy and Geology, there is an oven in 65.5% of Portuguese households. Being one of the equipment used to prepare meals, its energy efficiency is of the utmost importance.


When purchasing an oven, it is important to take into account the energy efficiency class: gas ovens are more efficient than electric ovens and, although gas is a fossil energy source, its consumption does not produce ash or solid waste.

Gas ovens are often composed of other electrical equipment (“grills”, fans, among others) that allow for other features, but that involve high consumption, so their use must be properly controlled.

If you are considering changing your equipment and purchasing a gas oven, you should consider the following points:

  • When the oven is switched on, it is able to adjust the flame to the ideal value, enabling faster cooking of food;
  • In the event of a power failure, you will be able to continue using the oven;
  • Gas equipment, despite all the rules in force, represents an increased risk (for example, gas leakage) so, when in operation, it must be monitored periodically and its maintenance must be carried out with the periodicity, established in the manual of instructions;
  • Unlike the electric oven, which has two resistances (lower and upper), the gas oven has only one heat source in the lower zone, promoting a non-uniform temperature distribution;
  • Cleaning a gas oven is more complex than cleaning an electric one, as it requires extra care in the area of ​​the gas plate.

Forno antigo

Um forno a gás de tamanho médio e classe energética D, devido à sua baixa eficiência, apresenta um consumo anual de 876 kWh, representando um custo de 112€/ano.

Forno A+

Um forno a gás natural com características semelhantes, de classe energética A+, representa um investimento a partir de 300€ e um custo de 32€/ano.


Ao substituir o seu forno antigo por um com classe energética A+, poderá obter reduções nos custos de gás natural na ordem dos 80€/ano.

Other tips
  1. Do not open the oven unnecessarily. Each time you do this you are losing at least 20% of the energy accumulated inside;
  2. Make the most of the oven’s capacity and cook, if possible, as many foods as possible;
  3. It is not normally necessary to preheat the oven for cooking lasting more than 1 hour;
  4. Turn the oven off just before you finish cooking: the residual heat will be enough to finish the process;
  5. Furnaces with internal ventilation favor uniform heat distribution, save time and therefore use less energy;
  6. Ceramic or glass containers retain heat better, making it possible to reduce the oven temperature and reduce energy consumption;
  7. Volume is one of the important elements in determining energy efficiency. The greater the volume, the greater the energy needs, so when choosing the appropriate oven, you must take into account the size of the containers you have for cooking food, which will depend on the size of the household.
Energy Label

The domestic oven energy label (Delegated Regulation (EU) No. 65/2014) covers both electric and gas ovens and applies to both isolated ovens and stoves, excluding appliances that have a heating function. microwave.

Energy consumption is measured for a normalized cycle, in a conventional mode and in a forced ventilation mode, the lowest consumption being considered between the two for the calculation of the energy efficiency class.

How to read the energy label:

  1. Supplier name or trademark
  2. Supplier model
  3. Gas operation
  4. Energy efficiency class
  5. Useful oven volume in liters
  6. Energy consumption / cycle under normal heating
  7. Energy consumption / cycle in forced ventilation
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