Even with genuine balofix valves. After a few years on heating. As soon as you use them they pixx out. Then you have to drain down to fix a leak on a valve to fix the initial problem.!
half a point for hammers yes bg fitted it 5k plus vat and the aavs have the auto shut offs under them you just have to lay on the unsupported push fit jointed pipework to reach them
a night mare to work on i cant belive any boiler doesnt fail safe when the water runs outand the stupidity of choosing that model to go in a loft at the top of the house
thomson your righ its hanging in the breeze right where you want to lay to reach the boiler