The new heating radius gives the following error:
26.243 Error ModManager.cpp:1758: Failed to load mod "more-quality-scaling": __more-quality-scaling__/data-final-fixes.lua:397: attempt to perform arithmetic on field 'heating_radius' (a nil value) stack traceback: __more-quality-scaling__/data-final-fixes.lua:397: in main chunk
I do have bobs mods that adds a bunch of heat pipe variants. Maybe those don't have heat radius set?

I guess I should add fallbacks to implicit default values for optional parameters, even if they are specified for all vanilla entities...

👍

Having the same error, one difference is that i have no mods that have anything to do with heat pipes. Hope it helps.

Do you have anything that adds/modifies nuclear reactors or the burner heating towers? Either way, the next update should fix this issue.