I didn't see this info anywhere but are you using O2 barriered tubing. If not, you will need a bronze pump, strainer, no steel fittings and the water heater should not be used for domestic water. I would look at the Vertex water heater as a heat source. It is condensing, reasonably priced and won't short cycle.
Oh, and we always use Beldon twisted pair wiring for sensors. It is the industrial standard.
Cheers
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