A slow-filling bath is a result of poor water pressure and water flow — the amount of water and the speed it is coming through the taps. If there is not enough water coming into the system, a pump may boost performance.
Salamander has a number of water pressure booster pumps to suit a variety of systems. There are CT Force, RHP and ESP pumps for gravity-fed systems, and HomeBoost pumps for combi-boiler and unvented systems.
If you have an exceptionally large bath or a very powerful shower with a large shower head, you will need a large volume of water directly from the mains via your boiler, or from very large hot and cold water tanks. The following products from Salamander may be suitable: CT Force, RHP, ESP.