Where the water level in the cold storage tank is below the level of the shower outlet a ‘negative head’ situation exists. Specialist Automatic Negative Head pumps to overcome this problem are available from Grundfos.

The Brass Pump range is undoubtedly the ‘Rolls Royce’ of Grundfos shower pumps, designed and manufactured to the highest of standards. With brass impellers and machined brass stampings these pumps can be genuinely described as ‘Heavy Duty’, and each model offers high performance and durability. These continuously rated regenerative pumps are suited to domestic, commercial or light industrial use. Products within this range are fitted with long-life silicon carbide seals and anti-vibration feet keep the operating noise to a minimum. All brass pumps are supplied with stainless steel flexible hoses, and are covered by a comprehensive 2 years warranty. A brass pump will transform any compatible shower system into a really enjoyable and invigorating power shower.

• Grundfos Amazon 4.0 Bar Twin Impeller Negative Head Automatic Brass Shower Pump
• Twin impeller
• Negative Head
• Part Number: STN-4.0 B
• Brass impellers and machined brass stampings
• Continuously rated regenerative pumps are suited to domestic, commercial or light industrial use
• Long-life silicon carbide seals and anti-vibration feet
• Supplied with stainless steel flexible hoses
• Suitable for use with 22mm pipework
• 2 Year Manufacturer's Guarantee