I'm in a similar situation, but my boiler burns propane. In the summer the only thing the boiler does is heat our hot water via an Amtrol boilermate system.
I like this idea you're working on. No moving parts or added plumbing is definitely worth something over efficiency.
Using an mppt or buck-boost converter circuit is a great way to get the most out of your panels. I was thinking about trying to build a buck-boost converter to play with, maybe implement it into small scale wind power. That way power that is produce under light winds (below the voltage required to do whatever I intend it to do) can still be put to use.
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