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Since you already have the Rinnai only using a Hybrid is a moot question. Ran into this type of micro short on/off problem before with dishwashers and washers.
Bosch's solution is a 2.5 gallon...

Alright, let's start from the beginning. Grand Hall is a Contract Manufacturer of Gas Grilles for Sears, Char-Broil, Weber and a few more.
They've expanded to make Hybrid DHW under the Eternal name...

FYI The CR series of Naviens had problems which required individual components to be replaced and upgrade kits installed. Also I know of 2 units where cracked components caused cabinet flooding and...

I saw this and just couldn't stop myself from commenting.
First, unless you contracted the installation on a T&M basis (Time and Materials, open end charges) you don't have much to complain about...

just burn your house down to heat water?
You all keep sticking your heads up your arse and relying on cheap NG and Petroleum prices (under $12 for propane) and by the time you realize what hit you...

You guys just don't get it....A Buderus and a indirect isn't a normal tank. It's really a tankless with an alternate heat source.
No 100-125 gal or less residential tank will produce 240-268 GPH....

Basically unless you designed it from the start any shower waste water would have to be lifted to flow through your Waste Water Heater Recovery System.
This adds a cost you're ignoring. Also a BTU...

Have you ever measured the GPM of that tub faucet? @ 48F inlet and 122F setpoint (74F Rise) that T-K3 should produce 4.3 GPM. And for you exact freaks the T-K3 is 199,000 Inside and the O/S model is...

Gosh it's nice to know people who know everything. Plumbers love tanks because, especially in emergencies, no one questions your charges or cost or efficiency they just want it fixed. You draw down...