We decided to replace the old diesel heater that came with the boat. After a long search we found the beautiful Refleks diesel heaters that are sold by Rietpol (Holland). Rietpol is a shipyard which was established in 1936 in the old village Spaarndam in The Netherlands. They import these heaters from Denmark and then customise them for example with a little window, radiator coil or a cook plate.
We only went to the shipyard for some information about the choices there where, but left the same day with a secondhand heater that the they had overhauled. Still left a hole in our budget, but is was a good investment nonetheless.