Home Assistant

This is my old implementation. I have discontinued its use because it relies on the user creating the relevant input_number.

It was also far more complicated than necessary due to the interplay between HA and Node-RED and probably also some shoddy logic on my part.

Working Theory

The below code creates 3 HA entities:

input_number.hot_water_temperature: This is used to set the desired hot water temperature. The code also injects the following custom attributes: flow which is the current flow of hot water in L/min and temp which is the currently set hot water temp.
switch.hot_water: This is an on/off switch which switches between 37C and 50C. Not strictly necessary but google assistant and siri cannot handle input_number so this is a workaround.
switch.automation_hot_water_timeout: This switch enables/ disables the automatic safety timeout. After 5 minutes of inactivity the hot water will revert to 37C. This is designed to avoid the situation where after setting a higher temperature you inadvertently scald yourself in the shower (especially important with young children with sensitive skin or where your hot water heater is capable of achieving more than 50C - strictly this should only be in a corporate environment).

In Home Assistant

Create an input_number helper called input_number.hot_water_temperature. It should have the following attributes:

initial: 37
editable: true
min: 37
max: 50
step: 1
mode: slider
unit_of_measurement: °C
icon: mdi:kettle-steam-outline
friendly_name: Hot Water Temperature

In Home Assistant Lovelace (Optional)

I am using the HACS custom card multiple entity row to display the flow and current temperature in lovelace neatly. lovelace screenshot

type: entities
entities:
  - entity: input_number.hot_water_temperature
  - entity: input_number.hot_water_temperature
    type: custom:multiple-entity-row
    name: Status
    show_state: false
    icon: mdi:water-pump
    entities:
      - attribute: flow
        name: Flow
        unit: L/min
      - attribute: temp
        name: Current Temperature
        unit: °C

Node-Red Flow

Import the following flow into Node Red - do not forget to configure the IP addresses and the HA API integrations as relevant for you.

flow screenshot

subflow screenshot

"Node

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