HTR-06Drill and fit the right fixing for your wallFor dot-and-dab, drill through the plasterboard and the air gap into the solid masonry behind — the fixing must be long enough to bridge this gap, typically 60-100mm overall, so use a long frame fixing or masonry screw with a plug rated for that depth. For solid brick or block with no dot-and-dab, drill an 8mm hole 50mm deep, insert a matching wall plug, and use a screw sized for it. For a timber stud, drive a wood screw into the centre of the stud itself, not just the board. For a metal stud, never use a plastic wall plug or ordinary wood screw — they strip straight through 0.5mm steel — use a self-drilling metal-stud fixing or a toggle-type hollow-wall anchor rated for the weight instead. For lath and plaster, find a timber lath with a pilot hole and screw into it, or fit a hollow-wall toggle rated for the plaster if you can't hit one. A heated towel rail is heavy and full of water, so if you only find plasterboard between studs with nothing solid behind, fit a timber noggin between the studs or fix through to the masonry behind before you hang it.