Worcester Greenstar Highflow 440CDi Condensing Combi Boiler

Worcester Greenstar Highflow 440CDi

The Worcester Greenstar Highflow 440CDi ErP is a floor-standing condensing combi boiler designed to provide both central heating and domestic hot water from one appliance.

With a rated heat output of 30kW, central-heating output range of approximately 7.4–29.2kW and domestic hot-water flow rate of up to 20 litres per minute at a 35°C temperature rise, the Greenstar Highflow 440CDi was designed for properties requiring strong hot-water performance alongside efficient central heating.

Worcester Bosch’s ErP documentation identifies the 440CDi as a condensing combination heater with an A-rated seasonal space-heating efficiency of 92%. Its declared domestic hot-water load profile is XL, with a B-rated water-heating efficiency classification.

Worcester Greenstar Highflow 440CDi

The Greenstar Highflow 440CDi is different from Worcester Bosch’s wall-mounted Greenstar combi boilers.

It is a floor-standing high-flow combi boiler, designed around a larger cabinet format measuring approximately:

• 850mm high
• 600mm wide
• 600mm deep

The appliance is intended for installations where a floor-standing boiler and high domestic hot-water flow rate are appropriate. Worcester Bosch documentation confirms the Highflow 440CDi’s 850 × 600 × 600mm cabinet dimensions.

30kW Condensing Combi Boiler

The Worcester Greenstar Highflow 440CDi has a rated heat output of 30kW.

Its central-heating output is approximately 7.4–29.2kW, allowing the boiler to modulate its heating output according to demand.

The ErP technical data records a 30kW rated output, 29.6kW useful output at the specified high-temperature test condition and 9.6kW output at 30% load under the low-temperature test condition.

High Domestic Hot-Water Flow Rate

One of the main reasons to consider the Greenstar Highflow 440CDi is its domestic hot-water performance.

The 440CDi provides a domestic hot-water flow rate of approximately 20 litres per minute at a 35°C temperature rise.

This high flow rate makes the boiler particularly relevant to properties where hot-water demand is a major consideration.

Worcester Bosch documentation lists the 440CDi with a 20 L/min flow rate and a maximum domestic-hot-water output of approximately 29.5kW.

No Separate Hot-Water Cylinder Required

As a combi boiler, the Greenstar Highflow 440CDi heats domestic water directly from the mains when a hot-water outlet is opened.

This means the standard combi configuration does not require a separate domestic hot-water storage cylinder or cold-water storage tank.

The Highflow documentation describes the appliance as a combination boiler that heats water directly from the mains.

The actual hot-water performance will depend on mains water pressure, incoming water temperature, pipework and simultaneous demand.

A-Rated Space-Heating Efficiency

The Greenstar Highflow 440CDi ErP carries an A energy-efficiency class for seasonal space heating, with documented seasonal space-heating efficiency of 92%.

The water-heating efficiency classification is B.

These ratings relate to the applicable ErP testing methodology. Actual system performance depends on installation, controls, operating temperatures, heating-system design and usage.

Condensing Boiler Technology

The Greenstar Highflow 440CDi is a condensing boiler.

Condensing operation allows the appliance to recover additional heat from water vapour in the flue gases when operating conditions allow condensation to occur.

Worcester Bosch’s ErP documentation specifically identifies the 440CDi as a condensing boiler.

Modulating Heating Output

The 440CDi is designed to modulate its heating output rather than operating continuously at one fixed output.

Its documented central-heating output range is approximately 7.4–29.2kW.

This allows the boiler to reduce its output when the heating demand is lower, helping the appliance match the heating requirement more closely.

Floor-Standing Highflow Design

The Highflow 440CDi is a floor-standing appliance rather than a conventional wall-hung combi boiler.

Its cabinet dimensions are approximately:

850mm high × 600mm wide × 600mm deep.

The Worcester Bosch literature indicates that the Highflow CDi cabinet is designed to fit beneath a standard kitchen worktop, while installation and servicing clearances must still be observed.

Installation Clearances

Manufacturer documentation specifies minimum clearances around the appliance.

The Highflow documentation identifies approximately:

• 15mm above
• 5mm left
• 5mm right
• 25mm front minimum for the appliance configuration

However, greater space may be required for installation, servicing and access, including 600mm servicing clearance at the front in the documented installation guidance.

The complete manufacturer installation manual should always be followed for the actual installation.

Natural Gas and LPG Versions

The Greenstar Highflow 440CDi ErP was supplied in both natural-gas and LPG versions.

Worcester Bosch documentation identifies:

• Natural Gas: 7731600098
• LPG: 7731600099

Both versions have a documented 30kW rated heat output and A-rated seasonal space-heating efficiency.

Important: The exact fuel version must be confirmed before purchase. Do not assume a natural-gas appliance can simply be installed on LPG without the correct manufacturer-approved configuration.

Highflow 440CDi ErP Specifications

Worcester Bosch’s technical documentation confirms the 30kW rating, 92% seasonal space-heating efficiency, A rating, XL load profile and 20 L/min hot-water flow. Current manufacturer literature also lists the Highflow 440CDi at approximately 112kg.

Highflow 440CDi vs Standard Wall-Hung Combi Boiler

The Greenstar Highflow 440CDi should not be treated as simply another compact wall-hung combi boiler.

Its key difference is its floor-standing high-flow format.

The larger cabinet allows the boiler to provide a higher domestic hot-water flow rate than many smaller combi appliances. The 440CDi’s documented 20 L/min flow rate is one of its principal selling points.

This makes it particularly relevant to projects where hot-water performance is more important than having the smallest possible wall-mounted boiler.

Who Is the Greenstar Highflow 440CDi For?

The Highflow 440CDi can be considered for suitable residential properties where the installation requires:

• High domestic hot-water flow
• A floor-standing combi boiler
• Direct mains-fed domestic hot water
• No separate hot-water storage cylinder
• Around 30kW heating capacity
• Condensing boiler technology
• A-rated space-heating efficiency
• A larger boiler cabinet

However, boiler selection should be based on actual heating demand and hot-water requirements rather than property size alone.

Replacement Boiler Considerations

If the Greenstar Highflow 440CDi is being purchased as a replacement boiler, the installer should verify:

• Existing heat demand
• Gas type
• Gas supply capacity
• Incoming mains-water pressure
• Hot-water flow requirements
• Existing pipework
• Flue configuration
• Condensate disposal
• Electrical requirements
• Installation clearances
• Local regulations
• Availability of replacement parts and manufacturer support

This is particularly important because the 440CDi is an older Highflow ErP model. Worcester Bosch’s current literature identifies specific manufacturing periods and documentation for the Highflow 440CDi, while newer Worcester Bosch boiler ranges are now available.

Important Product Availability Note

The Greenstar Highflow 440CDi ErP is an older model generation. Worcester Bosch’s current professional documentation separates the older Highflow 440/550 CDi literature from its newer boiler ranges.

Therefore, EuroFuelSupply should not describe this product as a current-generation Worcester Bosch boiler unless the exact stock status and manufacturer support position have been verified.

For SEO, the page should continue targeting the exact product because buyers still search for the model by its established name.

Why Buy the Worcester Greenstar Highflow 440CDi?

The Highflow 440CDi offers several important features:

• 30kW rated output
• 7.4–29.2kW central-heating output
• 20 L/min domestic hot-water flow
• Floor-standing design
• Condensing operation
• A-rated seasonal space-heating efficiency
• XL domestic hot-water load profile
• Natural-gas and LPG versions
• Direct mains hot-water production
• No standard separate DHW cylinder required

Buy Worcester Greenstar Highflow 440CDi in Europe

EuroFuelSupply supplies heating and energy products for supported European markets, serving homeowners, installers, trade customers, developers, retailers and wholesale buyers.

For the Worcester Greenstar Highflow 440CDi ErP, customers should provide the required fuel type, quantity and delivery destination so EuroFuelSupply can confirm current availability and the correct configuration.

For trade and wholesale requirements, request a quotation with your delivery country, location and required quantity.

Important: Gas boiler installation, commissioning, flue installation and fuel conversion must be completed by an appropriately qualified professional and in accordance with the regulations applicable in the installation country.

Frequently Asked Questions

What is the Worcester Greenstar Highflow 440CDi?

The Worcester Greenstar Highflow 440CDi is a floor-standing gas condensing combi boiler with a rated output of 30kW and a domestic hot-water flow rate of approximately 20 litres per minute.

Is the Greenstar Highflow 440CDi a combi boiler?

Yes. It is a combination boiler, meaning it provides central heating and domestic hot water from one appliance.

What is the output of the Worcester 440CDi?

The rated heat output is 30kW, while the documented central-heating output range is approximately 7.4–29.2kW.

What is the hot-water flow rate?

The Greenstar Highflow 440CDi provides approximately 20 litres per minute at a 35°C temperature rise.

Is the 440CDi condensing?

Yes. Worcester Bosch identifies the 440CDi ErP as a condensing boiler.

Is the Worcester 440CDi A rated?

Yes. The 440CDi ErP has an A-rated seasonal space-heating efficiency of 92%. Its water-heating efficiency class is B.

What are the dimensions of the Highflow 440CDi?

The documented cabinet dimensions are approximately 850mm high × 600mm wide × 600mm deep.

Is the Highflow 440CDi wall mounted?

No. It is a floor-standing boiler.

Does the 440CDi require a hot-water cylinder?

No. It is a combi boiler that heats domestic hot water directly from the mains, so a separate hot-water storage cylinder is not normally required.

Is there an LPG version?

Yes. Worcester Bosch documentation identifies the Greenstar Highflow 440CDi ErP LPG version as part number 7731600099.

Is the Greenstar Highflow 440CDi still a current model?

It is an older Highflow ErP model. Worcester Bosch’s documentation separates its older Highflow 440/550 CDi literature from newer boiler ranges. Buyers should therefore confirm stock, parts and support availability before ordering.

Is the 440CDi suitable as a replacement boiler?

It may be suitable for a replacement project where the exact model, fuel type, flue, heating demand, water supply and installation requirements are compatible. A qualified installer should assess the installation before replacement.