This Control Thermostat is the replacement for all Hot Spring manufactured from 1986-1988.
| Model | Year | Serial # Range |
| " | E 101 to E 17200 | |
| " | F 11500 to F 17200 | |
| Grandee | G 101 to G 6000 | |
| Home/Prodigy | H 101 to H 4015 | |
| " | HA 101 to H 1000 | |
| " | HP 1001 to HP 3850 | |
| I/O - Sovereign | IA 1010 to IA 14500 | |
| " | IO 001 to IO 14500 | |
| Jetsetter | J 101 to J 2950 | |
| " | JA 101 to JA 3100 | |
| Personal | PS |
Notes: The numbers on the control panel temperature dial do not correspond to any specific temperature. They are a convenient way to mark where a person likes the thermostat set.
