**Note: If your unit currently has no thermistor connected and is being used, understand that this is not optimal for your unit and one should use the hot water sparingly. Once your new set arrives, you can replace the thermistors and use your unit as needed.
Also, if you have an older unit with 2 red thermistors please make a note so that we can send the proper set. If your unit has a black and red thermistor (newer model) please make a note for these as well and the proper set will be shipped out immediately.
Description: New Thermistors w/ O-ring
Model #: THRM QC MEDLRG S103
Compatible With: models 18kW, 24kW & 27kW
Shipping Details: ** Any parts sold after 3pm EST M-F may be shipped next day.