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Ball type zone valve or thermo-electric?
Is there any inherent advantage to either traditional ball type zone valves such as Taco, Caleffi, or Honeywell, or the thermo-electric types now being offered by several companies? I'm primarily interested in 3/4" threaded, or Pex A connections. The new Caleffi units like the 676 series look very interesting. I don't know if this style valve is offered by other companies.
Do the Caleffi thermo-actuator heads have the same reliability as heads sold for use with a manifold? They look considerably larger, and hopefully more rugged.