Missing temp_step parameter for MQTT water_heater

[cociweb]

The problem

MQTT Water_heater integration is added in 2023 but somehow the temp_step parameter is left out. Based on the MQTT HVAC(climate) integration this parameter should be a float and by-default=1. This is important parameter to control the unit. (The precision parameter should be[is?] related only in the value indication.)

What version of Home Assistant Core has the issue?

core-2023.07.0

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant Core

Integration causing the issue

MQTT Water Heater

Link to integration documentation on our website

https://www.home-assistant.io/integrations/water_heater.mqtt

Diagnostics information

No response

Example YAML snippet

mqtt:
  - water_heater:
      name: Boiler
      mode_command_topic: "basement/boiler/mode/set"
      temp_step: 0.1

Anything in the logs that might be useful for us?

No response

Additional information

No response

[home-assistant[bot]]

Hey there @emontnemery, @jbouwh, mind taking a look at this issue as it has been labeled with an integration (mqtt) you are listed as a code owner for? Thanks!

Code owner commands

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[cociweb]

Let me add @hookedonunix as the original feature implementation is done here: https://github.com/home-assistant/core/pull/93644

[jbouwh]

The setting you are refering too is linked to is _attr_target_temperature_step. it is implemented for the core climate component, but documented, it is missing in the water_heater component. So this was never implemented in the core component neither documented. It needs an architectural discussion with a decision to add it.

[jbouwh]

Opened a PR to add the property to the climate entity developer docs: https://github.com/home-assistant/developers.home-assistant/pull/2001

To open an architectural discussion on implementing target_temperature_step you can start a discussion here: https://github.com/home-assistant/architecture/discussions

[jbouwh]

As this is not an issue, but a feature request, I need to close this, as it is not an issue with Home Assistant.