Robertshaw RS1100 Thermostat
Robertshaw RS1100 1H Digital Prog/Non-Prog
RS1100 is the direct replacement for 200-503 (Digital Replacement)
QUESTIONS & ANSWERS
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this is a replacement for the 200-503 what is the temp range
RS1100 could be the replacement one but out of stock now and back order lead time is at least 2 months out or longer.
And here is the tech info:
https://literature.neuco.com/250034-01_rs1000_spec_sheet.pdf