A single DHW timer entry. Inherits fields from BaseTimerItem:
enable: Whether this time period is active.
startHour/startMinute: Start time.
endHour/endMinute: End time.
workMode: Operating mode (usually fixed to heating mode for DHW).
targetTemp: Target hot water temperature for this period (°C). Note: The device accepts a precision of 0.1°C. Values will be rounded (e.g., 0.06 becomes 0.1).