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Yep, float rate. Assuming your shower heads and faucets are 2.6GPM. Call mfg and they will get you the right unit. I usually like to go bigger due to tubs in the house. Keep in mind that with a instant hot heater, the hot water will take longer to get to the faucet compare to the traditional tanks. There are ways to wire up a re-circ. pump with a timer and a temp sensor to turn it on and off accordingly. Trick is to flush it yearly and install it with a scale filter and change that yearly. It will save your heater as they can last a long time. I personally like Takagi. Its the Lexus and just works and works. AS far as I know, its still all made in Japan.
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