Looks like we need to buy 2 20 Amp double pole breakers, one for the 2750 Watt heating circuit and one for the water heater. We have a 15 Amp double pole that came with the panel that we figure we can use for the 2500 Watt heating circuit. 15 Amp is probably sufficient for the 2750 one too, but the price difference is pretty negligible.
We opened up the panel at our other place here that had similar heaters so we could be 100% confident in how it should be wired, so I think we're good now. We should be able to get the breakers we need before final.
Regarding the thermostats, there are only two wiring diagrams, one for power coming to the thermostat first and one for power going to the heater first. I figure maybe the heater doesn't come on if L1 isn't powered regardless of L2. The thermostats are definitely rated for 250 volts, so that seemed logical.
Thanks very much for all the help. If we wanted to get a consult from a local electrician on this stuff we'd be sometime around summer 2017, so it's a huge help.
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