Would be interested if you could answer just the two questions in post 56 in just your 10 mins Gray ?
but more to the point your continued suggestion that there is no need for training or assessment in this area may give the impression to those that do not have it, that there is no need to & they will start working with these systems & that can not be a good thing can it ????????????????
How many un-vent HW systems do you go out to where there are no installation