Positive Head Positive head are for gravity-fed systems only. As a rule, if your cold-water tank is above the shower (maybe you have a shower in a converted room downstairs) and you have a flow rate as little as 0.5 bar, then you will need a positive head shower pump. Twin Impeller Pump Twin pumps are designed using the highest standard of technology to boost your water pressure of both hot and cold water supply to a single shower, bath, shower mixer or mixer tap. Put a stop to low water pressure with this pump. It is perfect for transforming your unsatisfactory shower into a powerful and invigorating shower that you'll never want to leave. Powerful noise reducing technology It’s no surprise that shower pumps can be on the noisy side considering the job that they do. That being said, they don’t have to be, providing they’re designed with noise reduction in mind. are exactly that, featuring noise and vibration reducing feet which work in perfect sync with the natural vibration of the