Der findes flere versioner af nassenheiderfordamperen. Fælles for dem er at de består af en beholder til myresyren, en væge som trækker myresyren ud af beholderen og en flade hvorfra myresyren kan fordampe.
Denne fordamper består af to enheder: en myresyrebeholder og et fordampningskammer. I fordampningskammeret kan man sætte et papstykke af to forskellige størrelser. Fordamperen monteres på en liste i en ramme, således at fordamperen hæves op på midten af rammen. Dette for at få fordamperen op til varmen i bifamilien.
Det er vigtigt, at fordamperen placeres så tæt på yngellejet, at den er indenfor det område, som dækkes af bier. Derfor anbefales det at sætte fordamperen op ad den bagerste yngeltavle. Kommer fordamperen til at sidde uden for biklyngen, bliver fordampningen utilstrækkelig. I trugstadet placeres fordamperen bag den bagerste yngeltavle. Strækker yngellejet sig over to magasiner, anbringes der også en fordamper i det øverste magasin, placeret modsat i forhold til fordamperen i nederste magasin.
Det anbefales, at man anskaffer sig en sprøjteflaske til at fylde fordamperen med, da den er vanskelig at fylde på andre måder uden at spilde.
For begge typer fordamper starter behandlingen normalt efter sidste honningfratagning og den første fodring. Fordamperen skal blive siddende i 10-14 dage. Efter behandlingen fodres færdig.
Doseringen afhænger både af myresyrekoncentrationen og vægens størrelse. Normalt er den mellemste vægestørrelse passende, men i aflæggere (6-8 rammer) bruges lille væge og i Dadant kasser den store væge. I fordamperens vejledning anbefales 60% myresyre, men flere biavlere føler ikke at dette giver nok effekt med Nassenheider traditionel, det kan dog afhænge af temperaturen.
Nassenheider Pro giver en lidt større fordampning, så der bør 60% være tilstrækkelig. Ellers er der gode erfaringer med at anvende 85% myresyre (nu 75% myresyre), men så er det vigtigt ved tidlig behandling (start august) at bruge et nummer mindre vægestørrelse.
Ved sen behandling, f.eks. i slutningen af september når bierne er fodret færdig, anbefales 75% myresyre for at sikre tilstrækkelig fordampning ved den lavere temperatur.
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