Older Biltema devices in home assistant

Has anyone been able to add older version of biltema heaters to home assistant? I have few of them (models 44-30109 and 44-30104) and I am not able to find the original app for android or any manufacturers info to configure them in any way. I know these are few years old and the reliability of the original app wasn’t too good, but I would still prefer to use these fully functional heaters. Any help?