Don't Guess!
If you have a 125T or 170T heater you need to carefully examine  your heater's existing ignitor to assure that you order the correct ignitor. A customer recently emailed and said that online docs showed 2 completely different ignitors being used in the 125T and 170T heaters.

Maybe this will clear up the confusion.

125T Models- RH125AT, RHD125AT, RL125AT, RM125AT, RE125AT, M125AT, PKHD125T, TKU125T, UKU125T, RD125T

170T Models- RH170T, RH170AT, RHD170T, RE170T, RL170T, RL170AT, RE170AT, PKHD170T

This document is from the DESA manual

 

 
The bottom line is:
  • If the nozzle adapter bracket has a square ignitor hole then use ignitor HA1000 ( PP200 new number)
  • If the nozzle adapter bracket has a round ignitor hole then use ignitor HA1100 ( PP201 new number)
HA1000 HA1100
Pull the ignitor and look at it. Compare your ignitor to these photos.

Don't guess.

If you guess and order the wrong ignitor you have thrown your money away because there are no returns on these sensitive electronics.