The OP isn't asking for a hose kit, I only recommended it when he chooses to replace the heater tap. As for the clamps, I guess I can understand. I used the ones that came with the kit and I had to re-tighten them a few times as the hoses got worn in. The genuine ones are self adjusting so would do this automatically. In regards to over tightening them, yes this is definitely a case if your not careful.
When replacing the heater tap don't forget to put the heater on HOT. The heater tap functions by vacuum suction and HOT is OPEN. When you turn it to COLD is forces the heater tap to CLOSE by creating negative pressure and sucking it up. If you leave the heater on COLD when replacing the heater tap it won't function properly. But if you make a mistake it's a very easy thing to correct and you shouldn't need to take the heater tap out again. It's just a small vacuum hose you need to work with.