Rheem Water Softener

IotDude · November 17, 2025, 5:16pm

The API has a published API spec here:

https://api.myiquaapp.com/v1/docs

You should be able to easily generate an API client from the published spec, and control the device and retrieve data as needed. The spec is accurate and up-to-date with the new API.

There are rate limits, but they are much more relaxed than previously.

bjasiewicz · December 2, 2025, 9:29am

Hi,
I am trying to set up new instance with Viessman softener, but looks like there is no DSN number in the settings, but only System Serial, which cannot be accepted by Integration - what should I place there?

System Serial: 7938XXX-XXXXX-XXXX

Please help.

EDIT: I have checked API and serial number as above works fine - I needed to wait a little bit to load all properly. No DSN needed anymore to look for. Thanks

briis · December 3, 2025, 1:41pm

Put that number, including the dashes under Product Serial Number and enter your email and password. That worked for me

bjasiewicz · January 11, 2026, 8:41pm

Hi,
Still have some issues:

Water Usage Today is given in m3, not in liters - I did Helper to recalculate this, but in the documentation it shows it in liters - some bug? Helper does not work properly - in the midnight drops negative values.
Given today usage is very inaccurate - for instance I have 0.073 m3 used in the integration, but app iQua shows 295 l. Why so big difference?
There is every 5 minutes log with time change - can this be turned off? It just overloading logs.

jakadia · January 14, 2026, 8:41pm

I also created a nice little Node-Red flow to pull data from this API - it converts it to MQTT messages so you can use discovery to bring them into Home Assistant. All you need is username and password for Iqua and it starts working.

bjasiewicz · January 16, 2026, 8:35am

Can you share how to do it or some code to deploy?

jakadia · January 19, 2026, 9:02pm

Here you go, import the following flow to Node-Red - [ { "id": "subflow_iqua_api_v2", "type": "subflow", - Pastebin.com

Enter your creds for iqua and mqtt server info and deploy

bjasiewicz · January 28, 2026, 1:10pm

Hi,
I deployed code, after a few changes it was working, but I cannot find anywhere entities, do the show up automatically or I need to create something manually?

++ how to turn off units conversion?

jakadia · January 28, 2026, 1:54pm

You will need to add the MQTT integration. A device will be created and entities will be under there.

bjasiewicz · January 28, 2026, 2:34pm

I cannot add another service - I already have one there - ideas?

jakadia · January 28, 2026, 2:56pm

Can you send me an example of a payload that is getting sent to your Mqtt node. Did you set that up and it is showing connected?

bjasiewicz · January 28, 2026, 3:01pm

I put all in DM to You.

bjasiewicz · January 28, 2026, 3:27pm

Values are in place

bjasiewicz · January 29, 2026, 10:02am

There is finally working integration in HACS → GitHub - mutilator/homeassistant-iqua-softener: Home assistant integration for iQua app supported water softeners

NodeRed one looks fine, but if you have another MQTT boker used, will be problematic.

alexbeatle · May 14, 2026, 8:55pm

Just curious if this still requires API connection - hence cannot be completely offline?