Hello, a few month’s ago i have created my own app to connect our heatpump to homey. Since then i have been active using it. All seems to work great. I’am using it to adjust mode, heating temp but also to adjust heatwater temperature to use as much sunpower for heating it instead of buying current…

Thanks I already installed it. And it works instantaneously :rofl: My understanding for creating your heatpump device. Anybody should feel free to correct me: find the ip adress of your ISG. I found it under servicewelt on my router. It is very important that you configure it as a fixed ip on you…

In summer i manage max water temp according our PV powerinput. so normally it’s set to 50. as soon PV start loading to grid i reset this to max. I add your input to readme information.

Hi @H_van_Barneveld , I just reliased that the figures power consumption [-/water/heating] today uses the wrong unit. As it is power consumption, it should be given in Wh not just W. Not really critical, but could be confusing, and in Insights it is not able to be integrated in other power consum…

Hi! Has anyone experienced an app crash with the “CPU Warning Limit Reached” alert? Thanks for your help!

I installed it to today using it with a new WPE-I 08 H 230 Premium. It worked straight away and the transmitted values are correct. What I do not see are values such as the actual temperature and the setpoint temperature of heating circuit 1 or the actual and setpoint temperature of the buffer tank. …

I have installed the app and it works great. I played around with a modbus connection to the ISG some time ago and I have noticed some minor issues in the data. The total energy usage for heating and warm water are missing the mWh component. [image] [image] You need to add the mWh component x10…

Recently we moved to a new house. So I’am not longer a Stiebel owner and can not test/check any adjustment. Request about wrong values are caused by the way values are stored in the modbus-Gateway. If any ‘developer’ want to take over the app I’am willing to arange.

I am a Stiebel Eltron heat pump owner and developer with some time to spare. In the past I experimented with the Modbus connection to the ISG, primarily to monitor the exact power consumption of my heat pump. Unfortunately the ISG only records daily power usage, and only the total kWh is available …

Maybe you can add it into the app i already published? and take over this app? so bring together both functionalities? I’am not longer owner of a Stiebel so can not develop/test anymore.

Modbus integration for ISG-webinterface - STiebel Eltron heatpump

Developers

AthomUser April 8, 2026, 3:07pm 22

…removed… I should have posted it here: Heatpump Stiebel Eltron ISGweb - #16 by AthomUser

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Modbus integration for ISG-webinterface - STiebel Eltron heatpump

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