Brass shower pumps tend to be slightly more expensive than plastic shower pumps but you are getting quite a bit more for your money. Brass impellers and internal parts are superbly durable so a longer lifespan is guaranteed, providing you with a more powerful and satisfying shower. Long life isn’t their only advantage either, with a brass shower pump you also get supremely quiet operation with noise levels as low as 50dB. We divide our brass shower pumps into two sections, single and twin impeller pumps. A single impeller pump is designed to work with just one hot or cold feed whereas a twin impeller pump will function with both hot and cold.