Product Description

Grundfos Amazon Universal 4 Bar Twin Negative Head Shower Pump

Model: 96788176 / STN-4.0 B

The Grundfos Amazon STN-4.0 B Universal 4 Bar Twin Negative Head Shower Pump is a premium automatic twin impeller shower booster pump designed specifically for negative head plumbing systems where the cold water storage tank is positioned below the shower outlet. In these installations, a specialist negative head pump is required to detect water demand automatically and provide powerful, consistent water pressure, even when natural gravity flow is unavailable.

Part of the renowned Grundfos Amazon range, the STN-4.0 B is widely regarded as the “Rolls Royce” of shower pumps. Manufactured using heavy-duty brass impellers and precision-machined brass components, it delivers exceptional durability, outstanding performance and remarkably quiet operation.

Designed to boost both the hot and cold water supplies simultaneously, the STN-4.0 B provides a powerful 4.0 bar pressure increase, making it the ideal solution for luxury showers and high-demand domestic plumbing systems. Complete with intelligent automatic controls, anti-vibration feet and flexible hoses, it combines premium engineering with dependable everyday performance.

Grundfos Amazon STN-4.0 B Features

• Universal Twin Negative Head Shower Pump
• Model: STN-4.0 B
• Part Number: 96788176
• 4.0 Bar Pressure Rating
• Suitable for Negative Head Systems
• Twin Impeller Design
• Boosts Both Hot & Cold Water Supplies
• Heavy Duty Brass Impellers
• Precision Machined Brass Internal Components
• 230 Volt Power Supply
• 22mm Connections
• Centrifugal Pump Design
• Built-in Automatic Flow Switch
• Built-in Automatic Pressure Switch
• Anti-Vibration Feet
• Supplied with Flexible Hoses
• WRAS Approved
• CE Compliant
• 5 Year Manufacturer Warranty
• Grundfos Amazon Installation Guide
• Grundfos Amazon Pump Brochure

Key Features & Benefits

• Automatic Negative Head Operation – Specifically designed for installations where the cold water storage tank is below the shower outlet.
• Powerful 4 Bar Performance – Delivers exceptional water pressure for luxury showers and high-demand domestic systems.
• Twin Impeller Design – Simultaneously boosts both hot and cold water supplies for balanced, high-performance water flow.
• Heavy Duty Brass Construction – Premium brass impellers and precision-machined components ensure exceptional durability and reliability.
• Automatic Flow Detection – Integrated flow switch automatically starts the pump whenever water demand is detected.
• Automatic Pressure Control – Pressure switch automatically maintains system pressure and stops the pump after use.
• Quiet Smooth Operation – Anti-vibration feet significantly reduce vibration and operational noise.
• 5 Year Manufacturer Warranty – Long-term manufacturer support provides complete peace of mind.

Technical Specification

• Model: STN-4.0 B
• Part Number: 96788176
• Brand: Grundfos
• Product Type: Universal Twin Shower Pump
• System Type: Negative Head
• Pressure Rating: 4.0 Bar
• Power Supply: 230 Volt
• Connections: 22mm
• Pump Type: Centrifugal
• Approvals: WRAS Approved & CE Compliant
• Warranty: 5 Years

What’s Included?

• 1 × Grundfos Amazon STN-4.0 B Universal Twin Shower Pump
• 4 × Manufacturer Supplied Flexible Hoses
• Built-in Anti-Vibration Feet
• Installation Instructions

Ideal For

• Negative head plumbing systems
• Gravity-fed shower systems
• Boosting both hot and cold water supplies
• Luxury multi-outlet shower installations
• High-demand domestic bathrooms
• Replacement shower pumps
• Professional plumbing installations
• Homes where the cold water tank is below the shower outlet

Why Choose the Grundfos Amazon STN-4.0 B?

The Grundfos Amazon STN-4.0 B has been engineered for demanding negative head plumbing systems where conventional shower pumps cannot function correctly. Its intelligent automatic controls detect water demand without relying on gravity flow, ensuring powerful and reliable water pressure whenever it is needed.

Featuring premium brass construction, twin impeller technology and a comprehensive 5-year manufacturer warranty, the STN-4.0 B offers outstanding performance, exceptional durability and the trusted engineering quality that has made Grundfos a market-leading name in shower pumps.

Why Buy from SNH Tradecentre?

• Competitive prices on Grundfos shower pumps
• Large stock availability
• Nationwide delivery available
• Expert plumbing and heating advice
• Trade and public customers welcome
• Trusted UK plumbing supplier
• Collection available from our Kent trade counter