SSR outputs do last longer for sure. And I wouldn't worry about the alarm output's they will be fine. It's just relays wear out faster when subjected to higher loads and cycles. The PID may in all fact outlast your smoker, and if you just used the relay contacts directly, you may get 20 years use. But it may also crap out in 2 years. I always like putting in cheaper parts for the places that will see the most abuse.
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Dan Pesonen
Umm, a tank or 5
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