Grundfos MQ3 Pumps
Grundfos MQ3-45 now Scala 1 3-45
In stock
- Established 1975
- Trusted by thousands of customers
The Grundfos MQ3-45 has been discontinued and is succeeded by the Grundfos SCALA1 3-45, also known as the MQ Successor 3-45.
The SCALA1 3-45 is a fully integrated, self-priming, compact water booster pump designed for pressure boosting in domestic and light-commercial applications, such as garden irrigation or pressure boosting for one- and two-family houses and apartments. It offers slightly higher flow and pressure performance compared to the MQ3-45, along with enhanced functionality, including Bluetooth connectivity for remote control and monitoring.
If ordered we will send a Scala1 3-45
Please use the below video for help replacing a Grundfos MQ3-45
More about this product
Grundfos SCALA1 – Compact Self-Priming Multistage Booster Pump
The Grundfos SCALA1 is a sophisticated, self-priming multistage pump designed to integrate all the components of a pressure booster into a sleek and compact composite enclosure.
Key Features:
- Self-Priming Capability:
Lifts water from depths of up to 8 meters within 5 minutes, ensuring ease of installation and reliable performance in challenging conditions. - Compact Design:
Combines a pressure booster system into a streamlined, space-efficient unit. - Durable Construction:
The composite enclosure offers excellent durability and resistance to environmental factors. - Reliable Operation:
Ideal for setups at risk of dry running or leakages in suction hoses or pipes, ensuring consistent water supply. - Ease of Use:
Pre-filled water in the pump enables a smooth start-up process and dependable functionality.
This pump is perfect for residential, light commercial, and agricultural applications where efficient water lifting and pressurization are required. Its innovative design and robust performance make it a trusted choice for users seeking reliability and ease of installation.
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data sheet 2 PDFDownload
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instructions PDFDownload
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flow graph PDFDownload
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Standard delivery:
Standard delivery is free on most orders. Some items may incur a delivery charge depending on weight, size or value. Any applicable charge will be displayed at checkout.
Deliveries will typically be made between 7am and 6pm, Monday to Friday (excluding public holidays).
Next day delivery:
Next working day delivery is available for a £16.50 + VAT delivery charge.
Orders must be placed before 12 noon to qualify for next working day delivery. Orders placed after 12 noon on Thursday but before noon on Friday will be delivered the following Monday. Orders placed after 12 noon on Friday will be delivered on Tuesday.
Pallet/Large/Difficult items:
Some large, heavy or difficult to transport items may incur an additional delivery charge. Please contact us for a delivery quote before ordering.
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Frequently Asked Questions
Quick answers to common questions about the Grundfos MQ3-45 now Scala 1 3-45. For technical specifications, see the product details above; for sizing or installation advice, contact our team. If you have any other questions, we're happy to help.
What is a water booster pump?
A water booster pump increases the pressure of an existing water supply to give stronger flow at taps, showers and appliances. It can be a small inline pump fitted to the incoming mains, or a larger pump and tank set that draws from a break tank to feed the whole house. Boosters do not create water – they raise the pressure of the water already coming in.
What is the difference between an inline booster and a tank-and-pump booster?
An inline booster connects straight onto the incoming mains and is limited to 12 litres per minute under UK water regulations – examples include the Salamander HomeBoost and WaterBoost WB-Compact. A tank-and-pump booster, such as the Grundfos Home Booster or DAB Esybox with Esytank, draws from a break tank and can deliver much higher flow rates for larger homes with multiple bathrooms.
What is a variable speed booster pump?
A variable speed booster uses an inverter to adjust pump speed in real time to match demand. It maintains constant pressure as outlets open and close, runs more quietly than a fixed-speed pump and typically saves up to 50 per cent of the energy a fixed-speed equivalent would use. The DAB Esybox, DAB Esybox Mini 3 and Grundfos Scala2 are common variable speed examples.