Grundfos CMBE 1-44 98374679

Name: Grundfos CMBE 1-44 Variable Speed Booster Set 230V 98374679
Brand: Grundfos
SKU: 9091-144
Price: 1531.3 GBP
Availability: InStock

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Established 1975
Trusted by thousands of customers

The Grundfos CMBE 1-44 (part no. 98374679) is a compact variable-speed booster set that keeps constant water pressure in homes and light commercial buildings. Pump, frequency converter, pressure sensor, 2-litre tank and non-return valve come in one unit, WRAS approved for drinking water.

It gives 40 l/min at 2.8 bar at its rated point, up to 4.7 bar at low flow, and up to about 55 l/min, with a 0.55 kW single-phase motor and stainless steel pump.

2.8 bar

at 40 l/min (rated)

4.7 bar

Max. pressure

55 l/min

Max. flow

0.55 kW

Motor power P2

Genuine GrundfosWRAS approved2-year warrantyPart no. 983746791 x 230 V

Supplied without a plug on a 1.5 m cable, for connection by an electrician.

Full Description

More about this product

Full Description

The Grundfos CMBE 1-44 I-U-C-D-D-A (Grundfos part number 98374679) is a single-pump, variable-speed booster set from the Grundfos CMBE range. Its integrated frequency converter and pressure sensor hold a constant pressure as demand changes. It gives 40 l/min at 2.8 bar at its rated point, up to 4.7 bar at low flow, and up to about 55 l/min, with a 0.55 kW motor. Connections are Rp 1″.

2.8 bar

at 40 l/min (rated)

4.7 bar

Max. pressure

55 l/min

Max. flow

0.55 kW

Motor power P2

WRAS approved for drinking water. Pump housing and impellers in stainless steel.

CMBE 1-44 pressure and flow

Flow	Flow	Pressure	Head
0 l/min	0.0 m³/h	4.7 bar	48 m
10 l/min	0.6 m³/h	4.4 bar	45 m
20 l/min	1.2 m³/h	4.0 bar	41 m
30 l/min	1.8 m³/h	3.5 bar	36 m
40 l/min	2.4 m³/h	2.8 bar	29 m
50 l/min	3.0 m³/h	2.1 bar	21 m

Read from the Grundfos full-speed pump curve for 98374679 and matched to Grundfos’s rated duty point; figures are approximate (about ±0.1 bar). Pressure is what the pump adds: any pressure already at the pump inlet adds to it. The CMBE runs only as fast as needed to hold the pressure you set, so it can work anywhere under this curve. Maximum flow is about 55 l/min.

CMBE 1-44 specifications

Model	CMBE 1-44 I-U-C-D-D-A
Grundfos part number	98374679
Type	Compact variable-speed booster set, single pump
Rated duty point	40 l/min at 2.8 bar (2.4 m³/h at 28.7 m head)
Motor power P2	0.55 kW
Supply	1 x 200–240 V
Max. current	3.45–2.90 A
Speed range	360–4000 rpm (integrated frequency converter)
Pipe connections	Rp 1″ (ISO 228-1)
Max. operating pressure	10 bar (PN10)
Liquid temperature	0 to 60 °C
Max. ambient temperature	55 °C
Pump housing and impellers	Stainless steel EN 1.4301 (AISI 304)
Number of impellers	3
Shaft seal / rubber	AVBE / EPDM
Pressure tank	2 litres, built in
Non-return valve	Yes, built in
Drinking water approval	WRAS
Enclosure / insulation class	IP55 / F
Cable	1.5 m, supplied without a plug
Net weight	15.9 kg
EAN	5711493909194
Warranty	2 years (Grundfos)

Figures from Grundfos product data for 98374679.

Features

Constant pressure

Integrated speed control keeps the pressure steady as taps and showers open and close, rather than switching on and off like a fixed-speed pump.

All in one unit

Pump, frequency converter, pressure sensor, 2-litre tank and non-return valve come assembled as one compact set.

Dry-running protection

Built-in protection against running without water.

Pressure set on the pump

The required pressure is set on the pump’s own control panel.

Stainless steel hydraulics

Pump housing and impellers in EN 1.4301 (AISI 304) stainless steel.

WRAS approved

Approved for drinking water in the UK.

Applications

Houses, flats and apartment buildings with low water pressure
Small hotels, schools and offices
Boosting from a break tank or cold water storage
Domestic rainwater harvesting

Compare the CMBE range

Model	Part no.	Rated duty point	Max. pressure	Max. flow	Power P2	Connections
CMBE 1-44	98374679	40 l/min at 2.8 bar	4.7 bar	55 l/min	0.55 kW	Rp 1″
CMBE 3-62	98374693	70 l/min at 4.4 bar	6.5 bar	94 l/min	1.1 kW	Rp 1″
CMBE 3-93	98374694	70 l/min at 6.5 bar	9.8 bar	92 l/min	1.5 kW	Rp 1″
CMBE 5-62	98374696	100 l/min at 4.7 bar	6.6 bar	129 l/min	1.5 kW	Rp 1¼” in / Rp 1″ out
CMBE 10-54	98382190	205 l/min at 2.5 bar	5.4 bar	264 l/min	1.5 kW	Rp 1½”

Questions about this booster

What pressure does the Grundfos CMBE 1-44 give?

At full speed it gives up to about 4.7 bar at low flow, 3.5 bar at 30 l/min and 2.8 bar at its rated 40 l/min. The table above gives the full range. Any pressure already at the pump inlet adds to these figures.

Is the Grundfos CMBE 1-44 WRAS approved?

Yes. Grundfos lists WRAS approval for drinking water on this model.

Can it be connected straight to the mains?

A pump drawing directly from the mains supply pipe needs notice to your water supplier under the Water Supply (Water Fittings) Regulations 1999, and the supplier may not allow it. Many installations feed the CMBE from a break tank or cold water storage instead.

Does it come with a pressure vessel?

Yes. A 2-litre tank is built in, along with the pressure sensor and non-return valve.

Does it come with a plug?

No. It is supplied on a 1.5 m cable without a plug, for connection by an electrician.

Which CMBE do I need?

It depends on the flow and pressure you need at the taps. The CMBE 1-44 gives 40 l/min at 2.8 bar at its rated point. The range table on this page compares all five sizes; send us your property details and we will size it for you.

What warranty does it have?

A 2-year Grundfos manufacturer warranty.

Downloads

sales sheet PDF
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data sheet PDF
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Delivery Information

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 CMBE 1-44 Variable Speed Booster Set 230V 98374679. 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.

What does a water booster pump do?

A water booster pump raises water pressure to help supply taps, showers and other outlets when the existing system cannot meet demand.

Can a booster pump connect directly to the water mains?

Not every booster can. Direct connection depends on the product design and applicable water regulations; some systems require a break tank.

How do I size a water booster pump?

Assess simultaneous flow demand, required outlet pressure, available inlet conditions and the pressure losses in the pipework.

What types of Grundfos pumps are available?

Grundfos offers circulators, booster pumps, borehole pumps, drainage pumps and other solutions for domestic and commercial systems.

How do I identify the correct Grundfos pump model?

Use the model name and product number on the pump nameplate, then check the electrical, hydraulic and connection specifications.

Can a Grundfos pump improve household water pressure?

A suitably selected Grundfos booster system can improve water pressure or flow, subject to the property’s water supply and installation requirements.