Grundfos Scala Home Booster Pumps
Grundfos Scala 2 3-45 230v 98562865
- Established 1975
- Trusted by thousands of customers
The Grundfos Scala2 3-45 is a fully integrated variable speed booster pump delivering constant pressure to every outlet in your home. All components — pump, motor, drive, sensors, tank, and non-return valve — are built into a single compact unit. Cannot connect directly to mains — requires a break tank. Backed by a 2-year Grundfos warranty.
- Variable speed — constant pressure — automatically adjusts to match demand; 70 l/min max flow, 45m head
- Requires break tank — cannot connect directly to mains; self-priming to 8m from below-pump sources
- 44 dB(A) typical noise — water-cooled permanent magnet motor; suitable for indoor and outdoor use
- Flexible installation — horizontal or vertical; indoor or outdoor
- Dry-run and auto-reset protection — stops automatically on fault; retries every 5 minutes
- Fully integrated all-in-one — pump, motor, drive, sensors, tank, and non-return valves; 3-step installation
- Next working day delivery — when ordered before 5pm on a working day
More about this product
The Grundfos Scala2 3-45 is a fully integrated variable speed booster pump. All components — pump, motor, inverter drive, pressure and flow sensors, integrated tank, and non-return valves — are built into a single compact unit. Installation is a three-step process: connect the pipes, prime, and plug in.
The intelligent speed controller continuously adjusts pump speed to match household demand, maintaining constant pressure at every outlet even when multiple taps and showers run simultaneously. The water-cooled permanent magnet motor delivers 44 dB(A) typical noise — one of the quietest domestic booster pumps available. The Model2 is 3 dB(A) quieter than the original Scala2.
The Scala2 cannot connect directly to the mains — it must draw from a break tank, cold water storage cistern, or other below-pump water source. It is self-priming to 8 metres. Suitable for horizontal or vertical installation, indoors or outdoors. Backed by a 2-year Grundfos warranty.
Two of the most popular compact variable speed booster pumps at similar price points — compared side by side. Neither can connect directly to the mains.
Scala2 Model2 — the better choice when outdoor installation is needed, or when a break tank / borehole is already in place and installation orientation flexibility matters. No WiFi.
Esybox Mini 3 — higher flow (80 vs 70 l/min), higher head (55 vs 45m), higher max working pressure (5.5 vs ~4.5 bar), WiFi and voice control, longer 3-year warranty — and cheaper at £369 vs £422.48 + VAT. Indoor installation only.
How much does it cost and how is it delivered?
Can it connect directly to the mains?
What is the difference between this and the DAB Esybox Mini 3?
What is the difference between the 93013254 and the 98562865?
Can it be installed outside?
Is it suitable for use with a borehole or well?
What happens if the pump runs dry?
Does it have WiFi?
What warranty is included?
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Tech Sheet PDFDownload
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data sheet PDFDownload
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.
You may also need
Grundfos Scala2 connection hoses 300mm long to 22mm connection
Silence, engineered. A precision 3D-printed lattice, shaped to the Grundfos Scala2 and tuned to flex, shear and silence pump vibration before it reaches your floor.…
2 required per pump – 97894516 Length: 600mm Connection Type: Male and Female threaded
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Frequently Asked Questions
Quick answers to common questions about the Grundfos Scala 2 3-45 230v 98562865. 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.