Quote Originally Posted by zombie View Post
The best way is to do a code like this so it's highly resistant to failures and heaters last longer

Heater1
Fallback OFF
If Temp < 78.0 Then ON
If Temp > 78.2 Then OFF
If Time 00:00 to 11:59 Then OFF
If Temp < 77.8 Then ON
If Temp < 75.0 Then OFF

Heater2
Fallback ON
If Temp < 78.0 Then ON
If Temp > 78.2 Then OFF
If Time 12:00 to 23:59 Then OFF
If Temp < 77.8 Then ON


Under normal circumstances they alternate every 12 hours. If one isnt able to keep up, they both run together. In the event of a temp probe failure only heater 2 can run, which slows temp climb and keeps it reasonable.

You might be an engineer if...You have no life and can prove it mathematically.
SUPERB