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Example automations

Lower tank setpoint when it is hot outside to prevent heating with the BUH

At the moment the outside temperature as measured by the external unit is >= 25C the hot water tank can be heated up to 43C without usage of the backup heater which costs is not as efficient. As workaround this automation lowers the tank target temperature to 33C. You will need another automation to put the target tank temperature back to your normal setpoint at another time.

alias: LowerTankTemperature
description: Lower Alterma Tank temperature
trigger:
  - platform: time_pattern
    minutes: /10
condition:
  - condition: numeric_state
    entity_id: sensor.climatecontrol_outdoor_temperature
    above: 24
  - condition: numeric_state
    entity_id: water_heater.altherma
    below: 46
    attribute: current_temperature
  - condition: time
    after: "10:00:00"
    before: "23:00:00"
action:
  - service: water_heater.set_temperature
    data:
      temperature: 33
    target:
      entity_id: water_heater.altherma
mode: single