HomeAssistant entity ID is overwritten when adding multiple heating devices based on HomeAssistant Switch

[joopmartens]

Describe the bug

I would like to add both my heatpump and electric boiler as a heating device in EVCC and the GUI allows me to do this successfully each based on their own HomeAssistant Entity ID for the switch device.

What goes wrong is that the heating devices are both based on a HomeAssistant switch entity and this currently seems to be a single shared setting between the two devices.

The HomeAssistant Entity ID of the switch device for the first heating device is overwritten with the HomeAsssistant Entity ID of the second device.

After I changed the HomeAssistant entity ID of the switch device of the first heating device to the correct one, it also changed the HomeAssistant switch entity ID of the second heating device. (This was overwritten with the one of the first heating device)

Both heating devices validate successful when added using the GUI.

I would like to have multiple heating devices independent from each other also if they are both based on A HomeAssistent integration by using different HomeAssistant entities.

Steps to reproduce

1. Add first HomeAssistant switch based heating device
2. Add second HomeAssistant switch based heating device

Configuration details

evcc --database /var/lib/evcc/evcc.db config
[main  ] INFO 2026/03/02 17:28:16 config file not found, database-only mode
[main  ] INFO 2026/03/02 17:28:16 using sqlite database: /var/lib/evcc/evcc.db?_pragma=busy_timeout(5000)
charger
---
db:5 {Type:template Title: Icon: Product:Home Assistant Switch} map[heating:true icon:heater integrateddevice:true power:sensor.zb_powerplug_4_power standbypower:15 switch:switch.heatpump_dhw_enabled template:homeassistant-switch uri:*****]

meter
---
db:3 {Type:template Title: Icon: Product:Home Assistant} map[energy:sensor.netto_grid_energy maxacpower:0 power:sensor.netto_grid_power template:homeassistant uri:***** usage:grid]
db:4 {Type:template Title:SolarEdge Icon: Product:Home Assistant} map[energy:sensor.solaredge_i1_ac_energy_kwh maxacpower:16000 power:sensor.solaredge_i1_ac_power template:homeassistant uri:***** usage:pv]

vehicle
---
db:2 {Type:template Title: Icon: Product:Kia Bluelink} map[cache:15m capacity:58.3 icon:car language:en password:***** phases: template:kia title:KIA EV3 user:***** vin:*****]

loadpoint
---
db:6 {Type: Title: Icon: Product:} map[charger:db:5 circuit: defaultMode: maxCurrent:11 meter: minCurrent:1 mode:now phasesConfigured:1 planStrategy:map[continuous:false precondition:0] soc:map[estimate:true poll:map[interval:3.6e+12 mode:charging]] thresholds:map[disable:map[delay:1.8e+11 threshold:0] enable:map[delay:6e+10 threshold:0]] title:Heatpump vehicle:]
db:7 {Type: Title: Icon: Product:} map[charger:db:5 circuit: defaultMode: maxCurrent:11 meter: minCurrent:1 mode:now phasesConfigured:1 planStrategy:map[continuous:false precondition:0] soc:map[estimate:true poll:map[interval:3.6e+12 mode:charging]] thresholds:map[disable:map[delay:1.8e+11 threshold:0] enable:map[delay:6e+10 threshold:0]] title:Boiler vehicle:]

Log details

[lp-3 ] DEBUG 2026/03/02 17:41:13 set title: test
[lp-3 ] DEBUG 2026/03/02 17:41:13 set priority: 0
[lp-3 ] DEBUG 2026/03/02 17:41:13 set smart cost limit: <nil>
[lp-3 ] DEBUG 2026/03/02 17:41:13 set smart feed-in limit: <nil>
[lp-3 ] DEBUG 2026/03/02 17:41:13 set thresholds: {Enable:{Delay:1m0s Threshold:0} Disable:{Delay:3m0s Threshold:0}}
[lp-3 ] DEBUG 2026/03/02 17:41:13 set plan energy: 0kWh @ 0001-01-01 00:19:32 +0019 LMT
[lp-3 ] DEBUG 2026/03/02 17:41:13 set plan strategy: continuous=false, precondition=0s
[lp-3 ] DEBUG 2026/03/02 17:41:13 set battery boost limit: 100
[lp-3 ] DEBUG 2026/03/02 17:41:13 set session energy limit: 0
[lp-3 ] DEBUG 2026/03/02 17:41:13 set session soc limit: 0
[lp-3 ] DEBUG 2026/03/02 17:41:13 set soc config: {Poll:{Mode:charging Interval:1h0m0s} Estimate:0x2f3fd4068528}
[lp-3 ] DEBUG 2026/03/02 17:41:13 set default mode:
[lp-3 ] DEBUG 2026/03/02 17:41:13 set phases: 1
[lp-3 ] DEBUG 2026/03/02 17:41:13 set min current: 6
[lp-3 ] DEBUG 2026/03/02 17:41:13 set max current: 16

What type of operating system or environment does evcc run on?

Linux

External automation

• I have made sure that no external automation like HomeAssistant or Node-RED is active or accessing any of the mentioned devices when this issue occurs.

Nightly build

• I have verified that the issue is reproducible with the latest nightly build

Version

evcc version 0.301.2

[andig]

What goes wrong is that the heating devices are both based on a HomeAssistant switch entity and this currently seems to be a single shared setting between the two devices.

On HA side? What are the entities?

I would like to add both my heatpump and electric boiler as a heating device in EVCC

Not visible from your config- you only have a single device.

That said: not clear to me what issue you're experiencing.

[joopmartens]

The issues is taken place on the EVCC side.
I have added two heaters.

Heatpump:

Boiler:

Dashboard after adding the devices:

After adding the 2nd device in EVCC the HA entity ID of the switch and power measurement device of the first added device are overwritten/identical to the second added heating device. They also show the exact same power usage.

Settings of the heatpump after adding the second device that are now containing the entities from the boiler: