Faced with exploding energy prices and growing environmental concerns, choosing the right heating system is becoming crucial. Homeowners often find themselves lost between the different options available on the market: heat pump, pellet stove, gas system, etc. Each installer praises the merits of their solution. But what is it really? A team of German researchers finally provides concrete answers based on scientific data.
A rigorous methodology that changes the game
The scientists did not do things by halves. To obtain reliable results, they simulated the operation of 13 different heating systems in a typical two-story house. Their innovative approach combines life cycle assessment (LCA) to assess environmental impact and net present value (NPV) to measure economic viability. This double analysis makes it possible to identify truly efficient solutions on all levels.
The team took into account all the parameters: installation costs, energy consumption, maintenance costs, but also CO2 emissions and use of natural resources. The researchers even included the likely evolution of energy prices and future changes in the German electricity mix into their calculations.
The air-water heat pump with photovoltaics wins the prize
The results are clear: the air-water heat pump coupled with photovoltaic panels tops the ranking in terms of eco-efficiency. This system has an environmental impact 17% lower than the reference (gas boiler) while reducing costs by 6%. Even in the worst-case scenario considered by the researchers, this solution remains more efficient than many alternatives.
The remarkable performance of this duo can be explained by several factors. First, the air-water heat pump efficiently uses the energy present in the outside air. Afterwards, the addition of photovoltaic panels significantly reduces the electricity bill and the carbon footprint of the system. The researchers even point out that optimizing photovoltaic self-consumption could further improve these results.
Surprises in the ranking
The wood gasification boiler scores surprisingly well, coming in second in terms of eco-efficiency. It has an environmental impact 42% lower than the gas boiler, despite a 20% higher cost. This good result is explained in particular by the consideration of wood as a renewable resource, provided that it comes from sustainable forest management.
On the other hand, certain systems considered ecological disappoint. The pellet boiler combined with solar thermal and the heat pump with ice accumulator present the worst performances in terms of eco-efficiency. The researchers explain that the complexity of these systems and their high cost do not outweigh their environmental benefits.
The gas boiler, although economical to use, finds itself penalized by its significant environmental impact. It generates the highest greenhouse gas emissions of all the systems studied, even when coupled with thermal solar panels.
- The air-water heat pump with photovoltaics is the most eco-efficient system
- The wood gasification boiler surprises positively in second position
- Complex systems like the pellet boiler with solar thermal disappoint despite their ecological image
