Worcester Bosch Compress 2000 AWF 22kW 3 Phase Heat Pump | 7738602288

Description

The Worcester Bosch Compress 2000 AWF 22kW Heat Pump (model CS2000AWF 22 R-T, part number 7 738 602 288) is a full monobloc air-to-water heat pump that provides lower-carbon space heating and hot water from a single outdoor unit with no indoor unit required. It runs from a 400V three-phase supply and delivers flow temperatures up to 60°C, so it suits new builds with underfloor heating as well as renovation projects with existing radiators.

The 22kW three-phase unit suits large homes, multi-occupancy buildings and light commercial properties with a 400V supply. The unit achieves 4.4 COP at A7/W35, an A+++ ErP rating at 35°C flow and A++ at 55°C flow, with a DC inverter compressor, R32 refrigerant and adjustable sound levels down to 62dB(A) in silent mode.

Because the refrigerant circuit is factory sealed, a monobloc install needs no F-Gas qualification, and the pump, expansion vessel and heat exchanger are built into the outdoor unit for fast installation and simple maintenance. Backed by a 7-year guarantee (terms apply) and cascadable up to six units for larger projects.

22kW

Nominal output

400V

Three-phase supply

60°C

Max flow temperature

4.4

COP at A7/W35

62dB(A)

Silent mode, max sound

A+++

ErP class at 35°C flow

All-in-one monobloc design

One outdoor unit does it all: compressor, pump, expansion vessel and heat exchanger are built in, so there is no indoor unit and no F-Gas qualification is required to install it.

Planning permission may be required

The manufacturer's under 0.6 m³ no-planning statement applies only to the 4-6kW and 8-16kW units. At 1120 x 400 x 1557mm this three-phase unit is roughly 0.70 m³, so planning permission may be required. Check with your local planning authority before specifying.

Installation and electrical safety

Installation must be carried out by a competent installer and all electrical work by a registered electrician in line with BS 7671 and Part P. Isolate the mains before starting work. Confirm that a 400V three-phase supply with sufficient capacity is available at the property.

Hot water cylinder and system volume

This unit heats the water circuit only, so domestic hot water needs a separate cylinder served through a three-port valve. An immersion heater is required for disinfection and, if not connected to the heat pump, must be wired to an external time clock. Manufacturer technical bulletin TB 0186 (02/2025) sets a minimum open-system water content of 100L for this output band. Always check the current installation manual.

Key features

Full monobloc simplicity

A single outdoor unit with no indoor unit and no F-Gas qualification needed, so installs are quicker with fewer tools and less training.

Up to 60°C flow temperature

A high flow temperature of up to 60°C makes the unit suitable for new builds and renovations, including properties with existing radiators.

Efficient inverter technology

A DC inverter compressor and electronic expansion valve deliver 4.4 COP at A7/W35 and an A+++ ErP rating at 35°C flow.

Adjustable sound levels

Silent mode reduces maximum sound from 72dB(A) to 62dB(A) at A7/W55, helping with siting in busy neighbourhoods.

Easy access servicing

Key components such as the pump, expansion vessel and heat exchanger sit inside the outdoor unit, and the control box opens with just a few screws.

Scalable by cascade

Cascade up to six units for a combined output of up to 180kW, with the same controls and accessory range.

Technical specification

Product identity

Brand

Worcester Bosch

Series

Compress 2000 AWF

Model

CS2000AWF 22 R-T

Part number (MPN)

7738602288

Type

Air-to-water full monobloc air source heat pump

Refrigerant

R32 (GWP 675)

Supply

400V three-phase

Phase

Three-phase

Performance

Nominal output

22kW

COP at A7/W35

4.4

ErP class at 35°C flow (EN 14825)

A+++

ErP class at 55°C flow (EN 14825)

A++

Maximum supply flow temperature

60°C

Minimum flow rate

0.50 l/s

Minimum open-system water content

100L

Cascade

Up to 6 units (up to 180kW combined)

Acoustics

Maximum sound at A7/W55

72dB(A)

Maximum sound at A7/W55, silent mode

62dB(A)

Physical and siting

Chassis size

Large

Dimensions (w x d x h)

1120 x 400 x 1557mm

Outdoor unit weight

177kg

Minimum clearance, rear air inlets

300mm from any obstruction

Minimum clear zone, front air outlet

1,500mm

Mounting

Floor standing or wall mounted using the manufacturer antivibration kits and brackets

Certification, guarantee and controls

MCS certification number

041-K044-04 b

Guarantee

7 years (manufacturer terms apply; training required for maximum guarantee length)

Controls

Included controller with integrated temperature sensor, zone thermostat function, two-zone system management and an outdoor weather sensor.

Manufacturer accessory part numbers

Hose kit 300mm 1 1/4"

7-738-602-360

System freeze protection kit, 18-30kW

7-738-602-368

3-way valve, 18-30kW

7-738-602-525

Floor antivibration kit, 18-30kW

7-738-602-377

Wall antivibration kit, 18-30kW

7-738-602-378

Wall mounting brackets

7-738-602-374

Drain pan for condensate

7-738-602-371

3-phase electric back-up heater

7-738-602-370

Double zone distribution unit: direct + mixed (with mixing valve)

7-738-602-361

Double zone distribution unit: direct + mixed

7-738-602-362

DHW temperature sensor, 10m

7-738-602-363

DHW temperature sensor, 30m

7-738-602-364

Compress 2000 AWF output range

Output

Supply

Model

Part number

COP A7/W35

4kW

230V 1-phase

CS2000AWF 4 R-S

7738602277

5.1

6kW

230V 1-phase

CS2000AWF 6 R-S

7738602278

4.95

8kW

230V 1-phase

CS2000AWF 8 R-S

7738602279

5.15

10kW

230V 1-phase

CS2000AWF 10 R-S

7738602280

4.95

12kW

230V 1-phase

CS2000AWF 12 R-S

7738602281

4.95

14kW

230V 1-phase

CS2000AWF 14 R-S

7738602282

4.6

16kW

230V 1-phase

CS2000AWF 16 R-S

7738602283

4.5

18kW

400V 3-phase

CS2000AWF 18 R-T

7738602287

4.7

22kW

400V 3-phase

CS2000AWF 22 R-T

7738602288

4.4

30kW

400V 3-phase

CS2000AWF 30 R-T

7738602290

3.91

Frequently asked questions

Do I need an F-Gas qualification to install this heat pump?

No. The Compress 2000 AWF is a full monobloc with a factory-sealed refrigerant circuit, and Worcester Bosch states that no F-Gas qualification is needed to install it. The installation must still meet water regulations, BS 7671 / Part P electrical requirements and, for grant-funded work, MCS requirements.

Do I need a hot water cylinder or buffer vessel?

Yes, you need a separate domestic hot water cylinder if the system is to provide hot water, connected through a three-port valve (manufacturer 3-way valve for this output: 7-738-602-525). An immersion heater is required for disinfection. Manufacturer bulletin TB 0186 (02/2025) gives a minimum open-system water content of 100L for this output band, so a buffer or sufficient system volume may be needed. Always confirm against the latest installation manual.

Will I need planning permission?

The manufacturer's under 0.6 m³ statement applies only to the 4-6kW and 8-16kW outdoor units. This three-phase unit measures 1120 x 400 x 1557mm, roughly 0.70 m³, so planning permission may be required. Check with your local planning authority before installation.

What flow temperatures and efficiency can I expect?

The unit supports flow temperatures up to 60°C, with a COP of 4.4 at A7/W35, A+++ at 35°C flow and A++ at 55°C flow under EN 14825. Lower flow temperatures give better efficiency, so pair it with underfloor heating or correctly sized radiators. Output-versus-outdoor-temperature curves at 35°C, 45°C and 55°C flow are published by the manufacturer to help with emitter selection.

How loud is it and where should it be sited?

Maximum sound at A7/W55 is 72dB(A), reducing to 62dB(A) in silent mode. Leave at least 300mm clear behind the rear air inlets and 1,500mm clear in front of the air outlet. Fit the antivibration kit (7-738-602-377) for floor or wall mounting to reduce transmitted noise, and refer to the installation manual for full clearances.

Can I cascade this unit, and what guarantee does it carry?

Yes, the Compress 2000 AWF range can be cascaded up to six units for up to 180kW combined. The product carries a 7-year guarantee subject to Worcester Bosch terms, and training is required for the maximum guarantee length. The unit also holds MCS product certification (041-K044-04 b), which is needed for grant-funded installs alongside an MCS-certified installer, so check current scheme rules.

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