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I am planning a remodel of a 100+ year old house in Seattle. We are planning on removing the existing forced air furnace and replacing with in-floor heating. The energy source will be electricity. It seems to me the most efficient method would be electric resistance instead of hydronic. Wouldn't there be a loss in efficiency (and a more complex system) if you use electricity to heat the water in a hydronic system versus the near 100% efficiency of electric resistance? The only benefit I could see to having a hydronic system would be to possibly tie it in with a solar water heater.
Everything I've found online comparing hydronic versus electric resistance heating makes the assumption that you have an energy source other than electricity to drive your hydronic system (gas, propone). In Seattle we are lucky to have fairly inexpensive electricity. Plus I plan to install a PV system in the near future.
I'm leaning towards the electric resistance heating for the whole house (900 sf main floor and 800 sf basement) but would love to hear other's thoughts.