A positive head pump requires a gravity feed of water to start the impellers, meaning the shower head must be positioned below the cold water storage tank. A negative head pump draws water up and is used when the shower head is level with or above the cold water tank.
Positive and Negative Head Water Pumps for Gravity Systems
Our selection of shower pumps includes single and twin impeller models made to
improve water flow in gravity-fed systems. Whether you are dealing with a
positive or negative head setup, these devices increase the pressure of both hot
and cold water. They are typically installed alongside hot water
cylinders
to ensure a steady supply, making them a practical solution for improving flow
rates in low-pressure environments. When fitting a new pump, it is important to
match the bar rating to your specific requirements, such as a 1.5bar or 3bar
unit, to achieve the correct water delivery.
These pumps are typically used to supply consistent water pressure to modern bathrooms, ensuring smooth operation of mixer taps and shower heads. You can also use them to boost flow to individual basins or larger baths, reducing fill times significantly. While some properties require comprehensive Cold-Water Booster Systems, a dedicated twin impeller pump often provides enough pressure for a single room. The components usually feature robust brass bodies, EPDM O-rings, and quiet induction motors operating below 66dB.
Installation is straightforward thanks to flexible anti-vibration hoses and standard 15mm or 22mm push-fit connections. Many models incorporate automatic thermal switches and carbon-silicone-carbide mechanical seals, ensuring reliable, long-lasting operation that complies with standard water fitting regulations. The supplied anti-vibration mats also help to reduce noise transfer, allowing the pump to sit securely on the floor near the water source.
These pumps are typically used to supply consistent water pressure to modern bathrooms, ensuring smooth operation of mixer taps and shower heads. You can also use them to boost flow to individual basins or larger baths, reducing fill times significantly. While some properties require comprehensive Cold-Water Booster Systems, a dedicated twin impeller pump often provides enough pressure for a single room. The components usually feature robust brass bodies, EPDM O-rings, and quiet induction motors operating below 66dB.
Installation is straightforward thanks to flexible anti-vibration hoses and standard 15mm or 22mm push-fit connections. Many models incorporate automatic thermal switches and carbon-silicone-carbide mechanical seals, ensuring reliable, long-lasting operation that complies with standard water fitting regulations. The supplied anti-vibration mats also help to reduce noise transfer, allowing the pump to sit securely on the floor near the water source.
Shower Pump FAQ's
A shower pump should be installed as close to the hot water cylinder as possible, typically at the base. It must rest on a solid surface, such as a concrete block, to absorb vibrations and reduce noise. You should never screw the pump directly to floorboards.
No, water regulations prohibit connecting a shower pump directly to the mains supply. The pump must be fed from a cold water storage tank and a hot water cylinder to ensure it does not draw more water than the mains can provide.
You will need a pipe cutter, adjustable spanners, and standard plumbing tools. The installation requires 15mm or 22mm pipework, isolation valves, and flexible anti-vibration hoses to connect the pump without transferring noise into the pipework.
Yes, fitting a dedicated flange to the hot water cylinder is highly recommended. An Essex or Surrey flange prevents air bubbles from entering the pump, which can cause cavitation, reduce efficiency, and potentially damage the internal components over time.