Thats a heck of an expense to ensure a floor heat system stays running.
Is the gas system propane?
If its natural gas then I surely wouldn't be backing it up with electric, given the weak point in the utility is electric, and I am sure you have a pump on that system as well.
My point is, the chances of NG stopping is maybe 1/2 of 1/2% but electric depending on the area is very prone for failure.
If backup is that critical, I would be going with dual gas, dual pumps with utilization control and a NG generator to ensure the pump(s) stays running.
I would put them in parallel with each other and rotate use off the utilization control for the pumps. In the event of failure the switch over would automatically happen.
When its all said and done there is usually more said than done
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