Boiler, Solar, Propane Hot Water

I would appreciate feedback on a domestic hot water system using a BoilerMate, evacuated tube solar, and a propane backup hot water heating unit, all to heat a 1000 gallon hot water storage tank. My diagram follows. I haven't included isolation or shut-off valves.

The tank normally is to be heated by solar and the BoilerMate, with the propane used only as backup or to supplement at high usage times. There are only 4 ports available on the tank as indicated. The system is in use but each component has been jerry-rigged on the prior component(s), with first only propane, then the BoilerMate was added, and then the solar, all in a maze of plumbing. We have the opportunity to simplify the system, hence this diagram. Thanks



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I didn't show the plumbing between the wood boiler and the BoilerMate. Also, the solar has glycol, and a double wall plate hx is between the solar and the dhw system, and I didn't show that.