Replacing a Diesel Boiler with a LPG Boiler
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Why Convert a Boiler from Diesel to LPG?
Replacing a diesel boiler with an LPG one is a strategic choice for those who want greater energy efficiency, lower polluting emissions and a more practical and sustainable alternative. LPG is a versatile fuel, ideal for homes, businesses and agricultural or industrial activities, especially in areas not served by methane.
In this article we will see:
- Comparison of the calorific value of diesel and LPG
- How to calculate the conversion between the two fuels
- The practical advantages of replacement
- The process of installing a LPG boiler
Diesel vs LPG: The Calorific Value Comparison
Calorific value is the energy generated by burning a fuel. The higher the calorific value, the more energy is obtained from the same amount of fuel.
| Fuel | Lower calorific value (kWh/kg) | Lower calorific value (kWh/litre) |
|---|---|---|
| Diesel | 11.9 kWh/kg | 10.1 kWh/l |
| LPG (propane) | 12.8 kWh/kg | 6.9 kWh/l |
What Does This Mean in Practice?
- LPG has a higher calorific value per kg , therefore for the same weight it provides more energy than diesel.
- Diesel has a higher density , so for the same volume it provides more energy than LPG.
- However, LPG burns cleaner and has a higher efficiency in new generation boilers.
How to Calculate Diesel to LPG Conversion
To estimate how much energy is needed for heating, we start from the current diesel consumption and convert it to LPG.
Conversion formula:
If a system consumes 1,000 litres of diesel per year , we can calculate the energy requirement as follows:
1,000 liters x 10.1 kWh/liter = 10,100 kWh/year
To obtain the same energy requirement with LPG:
10,100 kWh ÷ 6.9 kWh/litre = 1,462 litres of LPG per year
🔹 So, to replace 1,000 litres of diesel you need approximately 1.46 litres of LPG.
Advantages of Replacing a Diesel Boiler with an LPG One
1. Lower Emissions and Greater Efficiency
LPG is more environmentally friendly than diesel:
- Reduces CO₂ emissions by 20-30%
- Does not produce solid residues or soot
- It has a more efficient and constant combustion
2. Lower Maintenance Costs
LPG boilers are easier to manage because:
- LPG burns cleanly, leaving no oily residue.
- Burners remain more efficient over time
- No scale builds up in pipes and filters
3. Storage Flexibility
LPG can be stored in external or underground tanks , of various sizes, with periodic refueling on request. This makes it perfect for areas not served by methane.
4. Incentives and Tax Deductions
Replacing a diesel boiler with an LPG one can benefit from tax deductions of up to 65% , based on current regulations for energy requalification.
How Does the Replacement Happen?
Process steps:
- Analysis of the current system : A technician evaluates the consumption and sizing of the new boiler.
- Tank selection : The capacity of the LPG tank is defined based on the expected consumption.
- Dismantling of the old boiler : The oil boiler is safely removed.
- LPG Boiler Installation : The new system is configured to optimize efficiency.
- Testing and start-up of the system : Checks are carried out to ensure safety and optimum performance.
Conclusion
Converting from diesel to LPG is a smart choice for those looking for a cleaner, more efficient and less expensive heating system to maintain. With the right installation and an accurate analysis of consumption, switching to LPG offers long-term savings and greater living comfort.
