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The Grundfos CMB 3-46 is a compact pressure boosting pump designed for domestic water supply and light commercial applications. It is supplied as a complete booster unit with an integrated PM1 pressure manager, enabling automatic operation based on system demand while protecting the pump from dry running.
The pump features a cast iron housing combined with multistage stainless steel impellers (AISI 304), delivering strength, corrosion resistance, and consistent hydraulic performance. The integrated non-return valve supports stable system operation and prevents backflow.
The pump operates at a rated flow of 3.1 m³/h with a corresponding head of 30.5 metres. Based on the performance curve, it delivers a maximum flow of approximately 70 L/min at low head conditions and achieves a maximum head of approximately 46 metres at shut-off. The unit is not self-priming and supports a maximum suction lift of 1 metre.
The unit is powered by a 0.5 kW electric motor operating on a 1 x 220–230 V, 50 Hz supply. The PM1 controller operates with a start pressure of 2.2 bar, ensuring consistent and automatic pressure boosting performance for residential systems.
FEATURES- Automatic Operation: PM1 controller enables demand-based start/stop for efficient system control
- Dry-Run Protection: Built-in protection prevents pump damage during water shortage conditions
- Self-Regulating Pressure System: Maintains consistent pressure without manual adjustment
- Compact Booster Design: Pre-assembled unit for quick installation and minimal setup time
- Non-Return Valve: Integrated check valve prevents backflow and maintains system pressure
- Multistage Hydraulic Design: Ensures smooth pressure delivery across varying demand levels
- Corrosion-Resistant Construction: Stainless steel wet-end components enhance durability
- Low Maintenance Operation: Simplified design reduces servicing requirements
- Quiet Performance: Designed for low noise operation in residential environments
- Plug-and-Play Installation: Ready-to-use system with minimal commissioning required
FAQs
General Product FAQs
1. How do I choose the right pump for my setup?
Selecting the correct pump depends on your required flow (L/min), total head (vertical lift + friction loss), and power source. If you're unsure, contact our team and we’ll size the right system for you.
2. Do you offer support with system design or setup?
Yes — we provide expert advice to help you choose, install, and optimise your pump system. Whether it's a simple setup or a custom solution, we’re here to help.
3. Do you offer complete pump solutions or just products?
We don’t just sell pumps — we provide complete solutions. From accessories and control systems to full packaged setups, we can supply everything required to get your system running efficiently.
Shipping & Availability
1. Do you offer Australia-wide shipping?
Yes — we ship across Australia. Bulk or oversized orders may incur additional freight charges otherwise we offer free shipping over $100*
2. How long does delivery take?
Orders are typically shipped within 1–2 business days, with delivery taking approximately 2–7 days depending on your location.
3. What courier or freight companies do you use?
We work with a range of trusted carriers including Australia Post, StarTrack, TNT, and other national freight providers depending on the size and location of your order. This allows us to ensure fast, reliable delivery across Australia, including regional and remote areas.
Warranty & Support
1. Do your pumps come with a warranty?
Yes — all products are backed by manufacturer warranties. Warranty periods vary depending on the brand and product type.
2. What support do you offer after purchase?
We provide ongoing support including:
- Installation advice
- Troubleshooting
- Spare parts supply
- System upgrades
3. What is the warranty process if something goes wrong?
If you experience an issue, simply contact our team with your order details and a description of the problem. We’ll guide you through troubleshooting and, if required, arrange repair, replacement, or manufacturer assessment in line with warranty terms.
Why choose Foundation Pumps?
1. Why choose Foundation Pumps over other suppliers?
We focus on supplying proven, high-quality pump solutions backed by real industry knowledge. Unlike general resellers, we understand how these systems perform in the field and provide honest, practical advice to ensure you get the right solution the first time.
2. Do you offer expert advice before and after purchase?
Yes — we support you at every stage, from selecting the right pump through to installation and ongoing use. Our team is available to assist with sizing, troubleshooting, and system optimisation whenever you need it.
3. Do you stock trusted brands and quality products?
We carefully select and supply pumps from reputable manufacturers known for reliability and performance. Our range includes both industry-leading brands and high-value alternatives that meet Australian standards and conditions.
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