The first organ, built in 1541, was lost in the great fire of 1699. In 1778, two regents from Heukelum — Simon van der Stel and “Regeerent Gasthuismeester” Frans C. de Groot — decided that congregational singing should once again be supported by an organ. The coats of arms of both men still adorn the organ, on its left and right sides.

The new organ was commissioned from Gideon Thomas Bätz, son of a renowned organ builder. Bätz constructed an instrument specifically suited to accompany a “loudly singing” congregation — featuring compound stops such as the Mixture and Cornet. The Trumpet is the only stop that is no longer original; it was replaced during a restoration in 1969.

The most recent restoration took place in 2015, carried out by the Elbertse firm from Soest. The project took longer than expected due to several hidden issues that emerged during the work. For instance, the Trumpet — which had never functioned optimally — received entirely new shallots, tongues, and tuning slides.