This control is no longer made. Please provide the complete model and serial number of your heater so we can provide you with the retrofit kit.
Teledyne Laars E2314900 Temperature Control, Mixing System, Rheos+
Used on the following models:
RHHH1200, RHHH1600, RHHH2000, RHHH2400, RHHV1200, RHHV1600, RHHV2000,
RHHV2400.