It's going to use the existing water heater as a storage tank. There will be a wireless sensor for checking the water heater temperature. (Think of it as similar to the Airtap, but located distant from the water heater.)
I'll probably go with the higher powered version of the D5 so there'll be plenty of headroom for highly restrictive plumbing. The fact that the D5 series uses something very similar to the Cindy Wu algorithm (or that might be exactly what it uses) means it should be possible to throttle it down quite a lot. (The Cindy Wu algorithm is tuned for the quirks of small fan motors, but a centrifugal pump is very similar to a fan as far as the torque/speed curves go.)
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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