I am trying to model two different boilers (gas fired and biomass boilers). I have following data and was wondering if it is enough to model the normalized boiler efficiency curve. The models that I have installed are Hamworthy Fleet F350v700 (Gas boiler) and BioMatic 500 of RuralEnergy (Biomass boiler). Could anyone please throw some light on how to model efficiency curves with this amount of data?