This report describes the small-scale investigation of the thermal absorption of water sprays produced by a range of selected hydraulic nozzles against a propane fired radiant heat panel. Measurements of thermal radiation attenuation have been made for six types of flat-fan water spray nozzles. Quantative measurements of spray characteristics, including droplet size, have been undertaken and a method to examine the spray pattern distribution has been developed. The results show that the most efficient thermal radiation attenuation is achieved with smaller droplets. Rapporten innehåller en småskalig undersökning av värmeupptagningen av vattenstrålar som produceras av en rad utvalda hydrauliska munstycken mot en propanuppvärmd värmetavla. Resultaten visar att den mest effektiva värmestrålningen förtunningen uppnås med mindre droppar.