Products & Manufacturers / Room Thermostats / Wired Thermostats / General Life THERMA HT390S
GENERAL LIFE · ROOM THERMOSTAT

General Life THERMA HT390S

THERMA HT390S is a General Life room thermostat. This profile documents the wired version’s published technical data and keeps other manufacturer-listed configurations separate.

Model Identification

Manufacturer: General Life
Series: THERMA
Model: HT390S
Category: Room thermostat

Key Specifications — THERMA HT390S (Wired)

Dimensions (H/L/W)100mm / 160mm / 18.2mm
Power supply (manufacturer: Operating Current)3V DC (2 x AAA Alkaline Battery)
Relay NO Switching Current2A/30VDC (Resistive Load) 0.5A/125VAC (Resistive Load)
Temperature measurement accuracy (manufacturer-reported)0.1°C
Operating sensitivity (manufacturer-reported)(-2.0°C) – (+2.0°C)
Setpoint range (manufacturer: Operating Temperature Range)(5°C) – (30°C)
Battery Life1 Year (2 x AAA)
Ambient operating temperature(-10°C) – (+50°C)
Storage Temperature(-20°C) – (+60°C)
Specification scope: These values refer to the wired THERMA HT390S only. RF and SMART versions have separate receiver, power and connectivity requirements. The manufacturer’s 0.1°C measurement figure is reproduced as reported; it is not an independently established ±0.1°C accuracy claim. Check the current manual and exact variant before installation.

Related Pages

THERMA series · General Life

Official Resources

Source: General Life’s THERMA HT390S wired product specification. Technical data checked on 11 October 2026.

Official THERMA HT390S Wired Product Page

AirAlign is an independent informational resource.

Model-specific wiring and selection — THERMA HT390S

The wired THERMA HT390S unit is shown with 100mm / 160mm / 18.2mm dimensions and 3V DC (2 x AAA Alkaline Battery) room-unit supply. These determine mounting compatibility and battery service; a wire to the boiler does not automatically power the thermostat.

Check its normally-open relay rating of 2A/30VDC (Resistive Load) 0.5A/125VAC (Resistive Load) against the actual appliance’s thermostat input. Resistive-load figures do not verify safe switching of motors or unlisted voltages, and should not be confused with a separate RF receiver rating.

The recorded temperature setpoint span is (5°C) – (30°C), and the manufacturer-listed sensitivity is (-2.0°C) – (+2.0°C). Treat sensitivity as a control parameter, not a substitute for measuring accuracy. Account for heating-system cycling, commissioning and sensor location before replacement.

Selection is specific to the wired THERMA HT390S variant: RF or smart alternatives need independent power, link and output evidence from the original General Life document.