vaillant 430

[ambrosia]

vaillant heat only boilers have 2 control knobs, if youre not using vaillant additional controls what is the correct position to leave the hot water knob
or does it not have any effect at all and vaillant dont care where you leave it

 

[Rabbitman]

If your not using the vaillant external cylinder it don't matter as it has absolutely no effect............. It's there in case you fit the cylinder and use a VR10 thermostat