Apart from a completely new boiler, some manufactures do offer the opportunity to retrofit an existing oil boiler with a new pellet burner. A Swedish company called Varmebaronen provide one example. This type of pellet burner has a vertical gravity pellet feed, and a horizontal burner.
Cost
Obviously if the burner is to be retrofitted to an existing oil boiler, the overall cost of the setup and installation will be lower.
Convenience
As the burner is retrofitted to an existing system, no alterations are needed to pipe work; this also means less disruption for the customer.
Disadvantages of Pellet Burner Attachments
Efficiency
The design of the boiler itself has a huge affect on efficiency, and how much heat the boiler extracts before sending it to the chimney. Retrofitting a new pellet burner to an old boiler may seem cheaper, however if the boiler design is very inefficient then fuel efficiency will be lower meaning more cost on pellets.
Space
With this type of pellet burner the space requirement tends to be larger than with other direct feed boilers.
Fuel Flexibility
The horizontal burner cannot take advantage of a wide variety of biomass fuel pellets. The only types of pellets which can be used in this system are low ash, no clinker fuels. Therefore the burner can only use high quality wood pellets.
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