Reading what you have said the problem seems to be a blocked filter.
Vaillant gas water heater problems.
The water heater constantly modulates between 30 and 100 of its output and thus producing as much heat as required with the minimum energy needed.
The latest atmomag line is the result of decades of continuous development and state of the art technology providing you with the highest level of warm water comfort and energy efficiency.
In case less water or lower temperature is needed turbomag automatically reduces the burner output.
Not enough hot water.
Compatible with vaillant range of wall mounted boilers floor standing boilers and solar thermal collectors.
Setting the hot water temperature control high or low makes no difference.
I have ruled out problems with gas supply burner dhw microswitch and the diverter valve.
The industry standard for water heaters and combi boilers is for them to be turned on with a flow rate of about 2 5 litres per minute.
Combinable into a system with vaillant heating appliances and controls.
My advice would be to get a professional to have a look at it asap.
I have seen vaillant gas water heaters but not any electric ones.
Go to gas hot.
The thermocouple provides a safety feature for a gas hot water tank.
To diagnose this we highly recommend getting an experienced gas safe registered vaillant boiler repair engineer on site to determine what the cause is.
When you turn on the central heating or a hot water tap water passes through a pipe that goes over a flame which heats the water up.
The flow from the hot water taps is fine we have no thermostatic showers or anything like that.
At the same time turbomag simultaneously adapts the gas rate depending on the water flow rate.
In case of need of more domestic hot water a second heat exchanger is powered by the heating device for additional temperature rise for reliable comfort.
Vaillant atmomag gas water heaters are especially designed for hot water generation.
Your problem could be the 6 bar water pressure.
Gas hot water heater troubleshooting information no hot water.
This gas hot water heater troubleshooting exercise starts with the thermostat.
The boiler is running perfectly for the ch reaching temperature modulating etc.
Check the pilot light.
These boilers are designed to work at around 2 bar so you may have blown a gasket inside the boiler causing the problem.