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Warmflow oil-fired boilers with a manufacturing date of prior to XXXXXX are not compatible with bio-fuel. Aspects of the burner in appliances produced after this date have been modified so that they are suitable for use with Class D heating fuels with a bio-fuel blend of up to 10%, subject to the correct specification of the burner and components within a bio-fuel compatible installation. You must consult with your installer to ensure that the entire oil installation is correctly prepared and capable of operating with bio fuels.