Z-Wave climate entities use an incorrect default min and max temperature value for HW heating thermostats

[Nick-Sills]

The problem

Z-Wave devices that support up to Thermostat Setpoint CC V2 do not provide a maximum and minimum setpoint temperature range. This results in the use of default values in Home Assistant.

An upper limit of 50 degrees Celsius, which validates against valid input, was introduced here: #118649

This change breaks hot water heating thermostats, such as the Qubino ZMNHID, rendering them unable to adjust the setpoint temperature above 50 degrees Celsius. This also affects other thermostats.

I am in 100% agreement with the premise of this discussion that defaults should be user-configurable: home-assistant/architecture#1152

However, an effective and simple workaround would be to increase the default maximum temperature to 100 degrees Celsius. This adjustment should allow all thermostats supporting Setpoint CC V2 to operate within an effective range.

What version of Home Assistant Core has the issue?

2024.12.1

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant Container

Integration causing the issue

Z-Wave

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

#118649
home-assistant/architecture#1152
zwave-js/node-zwave-js#7472

[Nick-Sills]

PR here:
#135442

[home-assistant]

Hey there @home-assistant/z-wave, mind taking a look at this issue as it has been labeled with an integration (zwave_js) you are listed as a code owner for? Thanks!

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[alex3305]

Duplicate of #123612.

However I would suggest to increase the limit to 100 degrees C which is the temperature of boiling water at sea level. Other limits seem pretty trivial to me. Because what would happen if someone owns a water heater that goes to 85? Do we get another issue and another PR again?

A boiling water limit would probably cover 99.99999% of the actual real world use cases.

[Nick-Sills]

Duplicate of #123612.

However I would suggest to increase the limit to 100 degrees C which is the temperature of boiling water at sea level. Other limits seem pretty trivial to me. Because what would happen if someone owns a water heater that goes to 85? Do we get another issue and another PR again?

A boiling water limit would probably cover 99.99999% of the actual real world use cases.

Fair enough, updated to100 degrees C.