Heat curve / Automation to set temperature with multiple input number choices

Configuration
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1

Hi,

I’m creating a heat curve automation in several steps in Home Assistant to control a floor heating system.

Use case:

  • The electric 2kW heater in the system is controlled via a switch on/off
  • An ESPHome device measuring water temperature going out in the system and going into the system (towards heater).
  • I would like to control the switch based on the water temperature going into the system.
  • As the water temperature needs to be different based on the outside temperature, I need to heat the water differently, therefore a heat curve is needed.
  • I would like to manually set the temperature that the ingoing water should have based on the outside temperature. I thought using input sliders for this (see picture below)

Problem:
How do I create an automation or similar to depending on outside temperature selects the corresponding heat curve value as set in the input sliders. My idea was to create a automation that sets a value in a template sensor to the wanted ingoing water temperature depending on outside temp, but Im lost and dont understand how to do this… =) please help

Then use this template sensor as a simple automation to change goal temperature in a generic thermostat that is already working…

image

2

Is this an electric heater?

3

Yes it is. a 2kW heater.

4

Made up all the entity IDs and embedded the template into the action rather than using a separate sensor:

triggers:
  - trigger: state
    entity_id: sensor.outside_temperature
actions:
  - action: climate.set_temperature
    data:
      temperature: >
        {% set in_dict = 
          {-15: 'input_number.t_minus_15', 
           -10: 'input_number.t_minus_10', 
            -5: 'input_number.t_minus_5', 
             0: 'input_number.t_0', 
             2: 'input_number.t_2', 
             4: 'input_number.t_4', 
             6: 'input_number.t_6', 
             8: 'input_number.t_8', 
            10: 'input_number.t_10' } %}
        {% set in_eid = in_dict.get(in_dict.keys()|select('>=', states('sensor.outside_temperature')|float(0))|first,'input_number.t_10') %}
        {{ states(in_eid)|float(0) }}
    target:
      entity_id: climate.water_heater

Does a lookup to convert outside temperature into an input number entity ID, then looks up the associated desired water temperature.

1 Like
5

Hi,

Amazing. Big thanks! So far it works perfectly. Will test it over the night and see how things go =)

image
image1049×856 104 KB

6

Is there a more detailed instruction on how you implemented the heating curve?

1 Like
7

Can you include your slider template here please?

8

I found this integration to calculate flow temperature from a heating curve and some more values: