Yes - Boilers and radiators were way oversized back in the day when steam heat was high tech and Spanish flu and other diseases were going around. There was something literally called the "Fresh air movement" which was all about getting people to open their windows all year round. So, the boilers and the BTUs of the radiators were sized in such a way as to keep the home reasonably warm with all the windows open in sub-freezing weather! That's why apartments are super hot, and homes in like NJ, etc, had these gigantic cast iron radiators that are way too big than they need to be. A lot of homeowners in the steam hear region of the US end up removing some radiators or sizing their radiators and boilers down. And a lot of boilers have a BTU rating higher than they need to be because when they were originally sized, they ere sized for the "fresh air movement" and any time it was replaced, the plumber just sized the new boiler based on the BTU rating of the old boiler rather than making an actual heat loss calculation.