diff --git a/bundles/org.openhab.binding.comfoair/README.md b/bundles/org.openhab.binding.comfoair/README.md
index 1b20b8ba840..e0a6cd57895 100644
--- a/bundles/org.openhab.binding.comfoair/README.md
+++ b/bundles/org.openhab.binding.comfoair/README.md
@@ -143,13 +143,13 @@ The ComfoAir binding supports the following channels.
 | preheater#preheaterFrostTime       | Number:Time              | Preheater Frost Time            | Frost minutes                                                                               | true      | yes      |
 | preheater#preheaterSafety          | Number                   | Preheater Frost Safety          | Frost safety setting                                                                        | true      | yes      |
 | **GHX Values**                     |                          |                                 |                                                                                             |           |          |
-| ewt#ewtTemperatureLow              | Number:Temperature       | GHX Temperature (low)           | Lower temperature of the geothermal heat exchanger                                          | true      | yes      |
-| ewt#ewtTemperatureHigh             | Number:Temperature       | GHX Temperature (high)          | Upper temperature of the geothermal heat exchanger                                          | true      | yes      |
-| ewt#ewtSpeed                       | Number                   | GHX Speed Up (%)                | Speed up of the geothermal heat exchanger                                                   | true      | yes      |
+| ewt#ewtTemperatureLow              | Number:Temperature       | GHX Temperature (low)           | Lower temperature of the geothermal heat exchanger                                          | false     | yes      |
+| ewt#ewtTemperatureHigh             | Number:Temperature       | GHX Temperature (high)          | Upper temperature of the geothermal heat exchanger                                          | false     | yes      |
+| ewt#ewtSpeed                       | Number                   | GHX Speed Up (%)                | Speed up of the geothermal heat exchanger                                                   | false     | yes      |
 | **Heater Values**                  |                          |                                 |                                                                                             |           |          |
 | heater#heaterPower                 | Number                   | Heater Power                    | Heater power value                                                                          | true      | yes      |
 | heater#heaterPowerI                | Number                   | Heater Power I-parameter        | Heater power I-parameter value                                                              | true      | yes      |
-| heater#heaterTargetTemperature     | Number:Temperature       | Heater Target Temperature       | Target temperature of the heater                                                            | true      | yes      |
+| heater#heaterTargetTemperature     | Number:Temperature       | Heater Target Temperature       | Target temperature of the heater                                                            | false     | yes      |
 | **Cookerhood Values**              |                          |                                 |                                                                                             |           |          |
 | cookerhood#cookerhoodSpeed         | Number                   | Cookerhood Speed Up (%)         | Speed up of the cookerhood                                                                  | true      | yes      |
 | **Enthalpy Values**                |                          |                                 |                                                                                             |           |          |