In Finland the datacentre heat is boosted to 60–90°C for district heating (new builds tend to use heat pumps) [1]

A 75-MW data center in Mäntsälä has provided 2/3 of the heat for the town (2,500 homes) for a decade [2]

1. https://www.creatingsustainablecities.org.uk/post/case-study...

2. https://www.sustainabilitymenews.com/waste-management/how-fi...