Bath fillers work in a similar way to a bath shower mixer in that they are fed with hot and cold water which is mixed inside the body of the tap.

The mixed warm water can then be directed down to fill the bath except that there is no option to divert the mixed water up to a shower. The main advantage of a bath filler over standard bath taps is that it is possible to gauge the temperature of the mixed water as it leaves the spout.

It is extremely difficult to fit the taps, waste and overflow once a bath is in place, so you need to this before you finally position it. Slip a plastic or rubber sealing gasket over the mixer tail, then pop this through the tap hole, so the gasket (which will ensure a waterproof seal) sits between the tap and the bath.

If the position of the bath is to be different to the old one then the water supply and waste pipes will have to be extended to the new position.

Never connect the cold off the rising mains and the hot off the tank feed low pressure. For safety reasons, if the main were to be shut down you could have very hot water coming out and of course you will never have a good control because of the very different pressures between the hot and the cold water. The cold effectively forces out the hot water.