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Hazelton, Kansas | Brian,
Relative energy prices can and do change over time.
If you install resistance heat in the concrete, you are basically locked in to a single energy source. I have a friend who installed electric resistance heat under a concrete shop floor, and really got hurt by a major rate hike.
If you install Pex with an electric water heater, you can change to propane or some other energy source for the cost of replacing the boiler.
FWIW.
MDS
Edit: This may offend some folks, but to use electrical energy to produce low grade space heat is somewhat of an insult to the second law of thermodynamics.
Unless your power comes from wind, solar, or hydro, the power company probably burned coal or natural gas, and paid roughly a 3:1 penalty to convert that fossil thermal energy to electricity. The other 2/3 (roughly) of the original fuel energy was rejected as low grade heat into the environment. To turn around and squirt that electrical power through a resistor and convert it back to low grade heat is, well, questionable. We do this all the time for convenience in everything from coffee makers to electric clothes driers. But you have other options for heating structures.
Mess with the second law, and eventually, you'll lose.
Just a little preaching, on this Sunday morning. :-)
Edited by crowbar 3/13/2016 03:14
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