From experience if any painting has been done near the home outside or inside the storage heaters will give off the same odd smell when theyre heated as the chemicals from paint react with the heater.
I decorated over a month a go though. The only other thing is that I have started to use hand santizer at my desk over the past two weeks.
But I still dont understand how its causing the heater smell when the heaters are off. Something is reacting in the heater to it as when I sniff right up close to the vents the smell is 100% coming from the heater.
Edit.
Wondering if just the heat of the summer can effect the heater heater storage actually and when it gets colder at night thats why its releasing the smell..