I've put in a number of Takagi units and some have had SDHW system on them so you may be fine. Two that are not good are the older electronic ignition Bosch and Paloma units as well as the non condensing BAXI ones. My understanding is that any of the condensing units are better at handling the higher input temps.
That said, some definitely have a fixed (sort of) temp rise built in and the units will give way too hot water if the inputs are close to set point. That temp deadband is tough for any gas powered unit.
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