Helix and Herpstat are pulse proportional thermostats, meaning they have no mechanical relay (i.e. no parts with friction on them that could wear out) so I can think of no reason to change one out that is performing normally, no matter how old it is.
But then again I am no thermostat expert, so I would recommend contacting one.
You can reach Spyder Robotics (Herpstat) at: sales@spyderrobotics.com
Helix (DBS-100) at: support@helixcontrols.com
And Reptile Basics (Vivarium Thermostat) at sales@reptilebasics.com
http://spyderrobotics.com/index.html
http://www.helixcontrols.com/
http://www.reptilebasics.com/thermostats
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