Here is a list of pasteurization temperatures and the time that is needed at that temp to properly sanitize something.
63ºC (145ºF)1) 30 minutes Vat Pasteurization
72ºC (161ºF)1) 15 seconds High temperature short time Pasteurization (HTST)
89ºC (191ºF) 1.0 second Higher-Heat Shorter Time (HHST)
90ºC (194ºF) 0.5 seconds Higher-Heat Shorter Time (HHST)
94ºC (201ºF) 0.1 seconds Higher-Heat Shorter Time (HHST)
96ºC (204ºF) 0.05 seconds Higher-Heat Shorter Time (HHST)
100ºC (212ºF) 0.01 seconds Higher-Heat Shorter Time (HHST)
138ºC (280ºF) 2.0 seconds Ultra Pasteurization (UP)
As you can see pasteurization can happen at well below the boiling point of water, I would say that your near boiling method is working just fine.