- binary_sensor:

    - name: "DHW: Use Boiler Aux Heater"
      unique_id: "dhw_config_use_boiler_aux_heater"
      state: >
        {% set manual_on = states('input_boolean.dhw_aux_heater_manual_override') == 'on' %}
        {% set hp_aux_off = states('sensor.heat_pump_auxiliary_heater') != 'on' %}
        {% set boiler_aux_allowed = states('input_boolean.dhw_allow_aux_heater_usage') == 'on' %}
        {% set boiler_temp_ok = states('sensor.boiler_temp')|float < states('input_number.dhw_aux_heater_cut_off_temperature_threshold')|float %}
        {# allowed checks if the resistance is permitted to run, mostly to check we're not running both boiler and HP resistance at the same time #}
        {% set allowed = hp_aux_off and boiler_aux_allowed and boiler_temp_ok %}
        {# here go various other conditions that influence the decision to run the boiler auxiliary heater #}
        {# PV Excess to boiler - now using shadow thermostat #}
        {% set pv_excess = states('input_boolean.dhw_use_excess_pv_for_aux_heater') == 'on' and 
          state_attr('climate.dhw_pv_excess_heating', 'hvac_action') == 'heating' %}
        {% set thermostat_activity_boost = state_attr('climate.boiler_temperature','preset_mode') == 'activity' and 
            state_attr('climate.boiler_temperature','hvac_action') == 'heating'%} 
        {% set thermostat_normal_boost = states('input_boolean.dhw_allow_aux_heater_in_all_modes') == 'on' and 
            state_attr('climate.boiler_temperature','hvac_action') == 'heating'%}  
        {{ manual_on or 
          (allowed and (
            pv_excess or
            thermostat_activity_boost or 
            thermostat_normal_boost
          )) }}

    - name: "DHW: PV Power Enough for Aux Heater "
      unique_id: "dhw_pv_power_enough_for_aux_heater"
      state: >
        {% set phase_buffer = states('input_number.dhw_pv_excess_usage_buffer')|float / 3 %}
        {% set phase_heater_power= states('input_number.dhw_aux_heater_power')|float /3 %}
        {% set turn_on_threshold = -1*(phase_buffer+phase_heater_power) %}
        {% if is_state('switch.boiler_heater_relay_switch_0', 'on') %}
              {{ states('sensor.deye_12_external_ct1_power')|float <= 0 
              and states('sensor.deye_12_external_ct2_power')|float <= 0
              and states('sensor.deye_12_external_ct3_power')|float <= 0 }}
            {% else %}
              {{ states('sensor.deye_12_external_ct1_power')|float < turn_on_threshold 
              and states('sensor.deye_12_external_ct2_power')|float < turn_on_threshold 
              and states('sensor.deye_12_external_ct3_power')|float < turn_on_threshold }}
            {% endif %}
      device_class: power