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| | 40 VA transformer, 120–24 VAC primary and secondary. Used with ERK to control multiple heaters. | |
| | External Relay Kit for controlling multiple heaters with 24V control. | |
| | 24V Wall Control Switch - HL3 and similar 24V Two Stage heaters. | |
| | Two Stage thermostat. 35°–75°F range. Voltage: 24, 120 VAC | |
| | Single stage or two stage programmable thermostat. 45°–90°F range. 24 VAC | |
| | 4 Hour Timer Control Switch - HL3 and similar 24V Two Stage heaters. | |
| | Two Stage thermostat with rain tight enclosure 40°–100°F range. Can be used with 24–277 VAC. |






