The Grundfos CMB5-46 PM1 is a compact multistage home water pressure booster pump set designed for automatic water pressure boosting in domestic and light commercial applications. Combining a Grundfos CM multistage pump with an integrated PM1 pressure manager, this system automatically starts and stops based on water demand while providing built-in dry-running protection. Built with a cast iron pump housing, stainless steel impellers, and EPDM rubber components, it offers dedicated performance for household water boosting in showers, bathrooms, and general domestic water supply systems.

Key Features:

• Combines a Grundfos CM multistage pump with a PM1 pressure manager.
• Enables automatic start and stop operation based on system water demand.
• Includes built-in dry-running protection to safeguard the pump.
• Equipped with an integrated return valve.
• Includes a 2 m mains cable fitted with a UK plug for power connection.

Product Specifications:

• Brand: Grundfos
• Model: CMB5-46 PM1 (CMB5-46PM1)
• Product Type: Home Water Pressure Booster Pump / Compact multistage booster set
• Rated Power (P2): 0.9 kW
• Voltage / Frequency: 1 × 220–240 V, 50 Hz
• Port Sizes: 1-1/4" inlet x 1" outlet
• Maximum Flow: 83 L/min (Rated Flow: 4.7 m³/h)
• Maximum Head: 46 m (Rated Head: 38.6 m)
• Maximum Current Consumption: 5.0–5.4 A
• Rated Speed: 2750–2790 rpm
• Pump Speed (Data Reference): 2900 rpm
• Start Pressure: PM1 – 2.2 bar
• Enclosure Class (IEC 34-5): IP55
• Insulation Class (IEC 85): F
• Pump Housing Material: Cast iron (EN-JL1030 / ASTM 30 B)
• Impeller Material: Stainless steel (DIN W.-Nr. 1.4301 / AISI 304)
• Rubber Components: EPDM
• Primary Shaft Seal: AVBE
• Liquid Temperature Range: 0–60 °C (Selected: 20 °C)
• Liquid Density: 998.2 kg/m³
• Self-Priming: No (Not self-priming)
• Return Valve: Yes
• Approvals & Markings: CE

Compatibility & Installation:

• Applications: Domestic water supply systems, light commercial booster systems, and household water boosting for showers and bathrooms.
• Installation Requirements: Must connect to pipework and plug into a ready power point.
• Weather Resistance: Not weatherproof — must be covered or placed under a shaded area.

Package Includes:

• Grundfos CMB5-46 PM1 Home Water Pressure Booster Pump set (includes pump, PM1 pressure manager, and 2 m mains cable with UK plug)

Warranty:

• 2 Years General Warranty (Additional +6 Months Warranty available via online registration).

Why Choose Grundfos CMB5-46 PM1?

• Delivers automatic start/stop control tuned to immediate water demand.
• Features integrated dry-running protection for safe pump operation.
• Utilises stainless steel impellers and a cast iron housing for reliable construction.
• Designed specifically for household water boosting including showers, bathrooms, and light commercial systems.