Domestically, there are two types of water pump: a mains booster pump and a shower or whole house booster pump.
A mains booster pump can be fitted to improve the pressure and flow of the mains cold water supply. In compliance with water fitting regulations, this is up to 12 litres per minute. Generally, a mains booster pump can improve the performance of all of the water appliances in your home.
A shower or whole house booster pump can be fitted to gravity-fed supplies to improve one or more water appliances in the home.
Shower pumps can help more than just a shower though. They can be used to increase water pressure and flow throughout the bathroom, speeding up your bath and cistern fill time considerably.