How to adjust the flow temperature on Vaillant Ecotec – Pre 2012 Models

How to calculate and adjust the flow temperature

In order to calculate the maximum flow temperature, you would have to work out the heat losses for each room, and make sure the lowest flow temperature you can run all the radiators and still achieve the required heat output.

However if you don’t have calculations we suggest to adjust from the default of 75 degrees downwards a degree or two until your system continues to work properly and heat your house up. Go back up if you have gone too low and your house is not warming up.

To adjust the flow temp

Older ecotecs with 4 circular buttons and 2 temperature dials

1. Turn the heating knob to the required flow temp.

The maximum flow temp can also be set using an engineer diagnostic level. This is usually outside the scope of a user and can cause possible risk to the boiler, so we cannot provide this information here.

Once you have adjusted the flow temperature you can then decide to proceed to advanced powerlevel settings. Make a note of the optimum flow temperature you have set, this will help decide the powerlevel. If you later decide to adjust your flow temperature redo the power level settings.