From what I've read the Helix units sometimes have a faulty ERROR message, however it is commonly stated that this does not effect performance. Both are digital. The Helix has a digital interace while the Big Apple has an analog dial interface. And the Big Apple has standard night-drop capability. The only advantage that I can see when using a Helix is the ability to monitor current temperatures without using a dedicated secondary thermometer.
Personally, I don't mind using a dedicated secondary thermometer...as long as the Big Apple Herp Power Proportional Thermostat is a solid product.
(Or am I missing something important?)
Thanks,
Chris
PS -- The Helix usually costs more.
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