on-line heat dissipation - clarification and spec-sheet error?

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I'm looking for a UPS, probably 1500VA. I'm excluding anything below the `Smart UPS' category.

One factor for me is the heat dissipation

SMT1500RMI2U advertises only 90 BTU/hr - is this correct?

SMT1500I advertises 135 BTU/hr, yet all other specs are the same (1500VA and 1000W) - is that also correct?

SMX1500RMI2U advertises 135 BTU/hr too - in fact, there is no other UPS under 135 BTU/hr, and non-APC models are quoting up to 200BTU/hr. So 90 BTU/hr looked out of place.

Also, is the `online heat dissipation' a constant figure, or is it only based on full load, or is it only when charging or running off battery? Are there more detailed figures available for these individual cases?

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