I think I've found a satisfying solution for my unusal need to heat a server rack. A used mini PC from ebay with a i3 CPU is now in my rack running BOINC. I now support the project worldcommunitygrid.org with distributed CPU power while generating heat. There is even a Amateur Radio team you can join. If you like to join the team and to donor CPU time, you can use this referral link: https://join.worldcommunitygrid.org?recruiterId=1149800&teamId=J65RSMBR9N1
I don't get money for this, just a virtual badge ;)
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