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rhowe
I imagine they are just set up for a lower supply pressure so that it can still be mixed with a normal cold pressure. It will rate limit the total supply to achieve the temperature you've set so the water volume could be appreciably lower if you want a high temperature and your hot water supply is low pressure.
There are no cheap ways to achieve higher hot water pressure, you ether need a storage tank with good pressure or a large enough boiler. Most people get close to a solution with a larger boiler.