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Economic viability of a Project

The following chart shows a table with some general values for current working of a boiler that operates 1.200 h./year (even though it is necessary to perform an individual study for each case).



Surface of the boiler room

Silo volume (space for stocking pellet)

Consumption pellet / year


25 kW

7 m²

10 m3

6 t

Annual - Yearly

40 kW

9 m²

15 m3

9 t

Annual - Yearly

100 kW

10 m²

22 m3

23 t


300 kW

40 m²

65 m3

70 t


500 kW

50 m²

100 m3

115 t



Economically it is an investment with a pay-back of 4- years for small power boilers (less than 60 kW), and in 2-3 years for high power boilers (more than 200 kW). This pay-back could be different depending on the consumptions.

The price of fuel now is the following:

Price pellet 0,038 €/kWh        Estimated annual rise 3% (around consumer price index -CPI)
Natural Gas Price 0,045 €/kWh Estimated annual rise  6 %
Diesel Price 0,070 €/kWh Estimated annual rise 6 %
Propane Price 0,092 €/kg Estimated annual rise 6 %
Electricity price 0,1 €/kWh Estimated annual rise 3 % (around CPI)


These prices are the most common for small consumers. In the case of large consumers that need a greater volume of fuel, they will get better prices.

The grant amounts vary depending on the call. Normally the grants offer at least 30% of the cost of installation.

For example, if we have a house in northeast of Spain with a medium-high consumption of heating and hot water, we can estimate a pellet consumption of 200 kg / kW needed approximately.


Some examples of amortization, for an average use of 1,200 h of heating per year (in houses) are shown in the following graphic:

Comprativa de costes

In buildings where consumption is greater than 1200 h / year, as hotels, sports centers, spas, residences, etc.. These amortization are reduced significantly. 


Comprativa de costes


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