I have an Intergas ECO RF 24. It's recently been installed with a Joule Cyclone indirect UVC. My understanding was the ECO RF can act as a system boiler despite being a combi. However, i noticed that the HW tap in the kitchen appears to be calling for heat from the boiler (as you would expect with a combi system). But surely this should not happen as i have a UVC. Does this behaviour sound right?