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Worcester Bosch Heat Pump Review

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Worcester Bosch In Brief:

Bosch is a globally renowned company which has a wide range of products, including heating, air-conditioning and household appliances. It is particularly notable for its power tools, which are considered among the best by building professionals.

Worcester was a British company, making advanced boilers and other heating appliances that merged with Bosch in 1996 to form Worcester Bosch, which is the British subsidiary which sells conventional boilers and air conditioning units, as well as renewable power sources like solar panels and heat pumps.

Worcester Bosch heat pumps are recognised as reliable and durable, and the range comprises different models which would suit all kinds of residences. They are eligible for various grants to offset some of the cost of purchase and installation. 

The basic warranty offered is two years but users can purchase an extended warranty and service contract.

Worcester Bosch Company Overview:

The Bosch Group is a leading global supplier of technology products and services. It employed roughly 421,000 staff worldwide in 2022. The company generated sales of 88.2 billion euros in that same year. Its operations are divided into four business sectors: Mobility, Industrial Technology, Consumer Goods, and Energy and Building Technology.

Worcester Bosch Heat Pump Specifications

Worcester Bosch heat pump
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CS7001i AW Outdoor Unit and Indoor Unit

This is a split heat pump range with an outdoor unit and an indoor module, which of course uses up more space than a monobloc type. It is a high-efficiency air-to-water heat pump which delivers heating and hot water, suitable for both new-builds and retrofitting into existing homes.

There are five models in this range, rated from 5kW output to 17kW.

Main features:

  • Harnesses outside air temperature and boosts it to deliver renewable heating and hot water
  • Quiet in operation with Quiet Mark certified
  • Bosch’s renowned design and build quality
  • Eligible for £5,000 government grant
  • Reduces fuel bills and the building’s carbon footprint
  • Suitable for all home sizes including those located in high-density areas
  • No pipework in the ground is necessary
  • Reliable and low-maintenance

Technical details:

  1. CS7001i AW-5kW
Energy Efficiency Class (35°C)A+++
Energy Efficiency Class (55°C)A++
Water Heating Efficiency ClassN/A
Water Heating Declared Load ProfileN/A
Heating Power at A2 / W355.32
Coefficient of Performance (COP) at +7 / W354.69
Sound pressure level at a distance of 1 m dB(A)39
Sound Power Level Outdoors (dBA)47
  1. CS7001i AW-7kW
Energy Efficiency Class (35°C)A+++
Energy Efficiency Class (55°C)A++
Water Heating Efficiency ClassN/A
Water Heating Declared Load ProfileN/A
Heating Power at A2 / W356.26
Coefficient of Performance (COP) at +7 / W355.31
Sound pressure level at a distance of 1 m dB(A)39
Sound Power Level Outdoors (dBA)47
  1. CS7001i AW-9kW
Energy Efficiency Class (35°C)A+++
Energy Efficiency Class (55°C)A++
Water Heating Efficiency ClassN/A
Water Heating Declared Load ProfileN/A
Heating Power at A2 / W358.95
Coefficient of Performance (COP) at +7 / W355.02
Sound pressure level at a distance of 1 m dB(A)40
Sound Power Level Outdoors (dBA)48
  1. CS7001i AW-13kW
Energy Efficiency Class (35°C)A+++
Energy Efficiency Class (55°C)A++
Water Heating Efficiency ClassN/A
Water Heating Declared Load ProfileN/A
Heating Power at A2 / W3513.07
Coefficient of Performance (COP) at +7 / W354.68
Sound pressure level at a distance of 1 m dB(A)47
Sound Power Level Outdoors (dBA)55
  1. CS7001i AW-17kW
Energy Efficiency Class (35°C)A+++
Energy Efficiency Class (55°C)A++
Water Heating Efficiency ClassN/A
Water Heating Declared Load ProfileN/A
Heating Power at A2 / W3511.71
Coefficient of Performance (COP) at +7 / W355
Sound pressure level at a distance of 1 m dB(A)45
Sound Power Level Outdoors (dBA)53

CS7400i AW Outdoor Unit and Indoor Unit

This is the quietest heat pump offered: the Bosch 7400i AW air-to-water heat pump is perfectly suited for both new builds and complete home renovations. This split unit heat pump utilises high-efficiency, low-carbon home heating technology to deliver green energy suitable for home heating and hot water.

There are two models in this range, rated at 5kW and 7kW, under average climate conditions.

  • Harnesses outside air temperature to deliver renewable heating and hot water
  • Extremely quiet in operation with Quiet Mark certified
  • Eligible for £5,000 government grant
  • Reduces fuel bills and a home’s carbon footprint
  • Suitable for all home sizes including use in urban areas
  • Doesn’t require any pipework in the ground
  • Low maintenance

Technical details:

  1. CS7400i AW-5kW
Energy Efficiency Class (35°C)A+++
Energy Efficiency Class (55°C)A++
Water Heating Efficiency ClassN/A
Water Heating Declared Load ProfileN/A
Heating Power at A2 / W355.48
Coefficient of Performance (COP) at +7 / W355.01
Sound pressure level at a distance of 1 m dB(A)42
Sound Power Level Outdoors (dBA)50
  1. CS7400i AW-7kW
Energy Efficiency Class (35°C)A+++
Energy Efficiency Class (55°C)A++
Water Heating Efficiency ClassN/A
Water Heating Declared Load ProfileN/A
Heating Power at A2 / W357.29
Coefficient of Performance (COP) at +7 / W355.01
Sound pressure level at a distance of 1 m dB(A)42
Sound Power Level Outdoors (dBA)50

Like all split units, it requires indoor space, but if you are replacing an existing boiler then it should be reasonably simple to put the indoor module in that space. However, if you are adding a heat pump to your existing boiler – the “belt-and-braces” approach to ensure that there is backup heating in all circumstances, then sufficient space will need to be available to mount the unit.

Note that the latest research from Oxford University, in collaboration with the Regulatory Assistance Project think-tank shows that heat pumps outperform conventional heating in cold climates, confounding criticisms that heat pumps are inadequate in subzero conditions. So there is a case for completely replacing an existing boiler, rather than having both units working in tandem.

Bosch Compress Hybrid 7000i AW

This is the conservative approach to home heating: the Hybrid 7000i AW heat pump delivers low carbon heat, supported by all the benefits and back-up of a gas combi boiler for all year-round comfort. It ensures peace of mind for people who are concerned about the reliability of heat pumps, particularly in low temperatures. It should be noted that heat pumps have fewer moving parts than conventional boilers so there is less to go wrong with them.

Like the rest of the Bosch range, they are suitable for new build homes and can be retrofitted into existing residences.

The control system is automatic, so, depending on both the outdoor air temperature and the room heating requirements, the heater will use either the heat pump or the boiler, or sometimes the two together.

The Hybrid 7000iAW is compatible with Bosch’s 5kW, 7kW and 9kW air-to-water heat pumps. The advantage of this model is that it delivers cost and carbon emissions immediately while being easy to install and interface with existing pipes and radiators.

The hybrid unit is installed between the outdoor heat pump and an existing boiler and optimises the home heating operation.

  • Quiet Mark approved 
  • Sound levels similar to a modern fridge
  • No need for hot water storage
  • Bosch’s renowned design and build quality
  • Suitable for all home sizes
  • Doesn’t require any pipework in the ground
  • Low maintenance

Technical details:

ColourWhite
Width (mm)350
Height (mm)706
Depth (mm)246
Weight (kg)N/A
Rated AirflowN/A
Sound Power Level db(A)36
Sound Pressure LevelN/A
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Worcester Bosch Heat Pump Pros and Cons

Pros

  • Durable and reliable
  • Quiet in operation
  • Stylish looks

Cons

  • Short duration warranty
    Can be tricky to fit in older homes

Worcester Bosch Heat Pump FAQs

Do heat pumps work in the winter?

A: Recent research by Oxford University shows that heat pumps can heat homes and deliver hot water in quite severely cold conditions, and certainly in the British winter. This refutes various media articles that heat pumps function poorly in subzero temperatures.

What’s a hybrid system?

A: This is a system where the heat pump is installed in parallel with an existing boiler, and the control unit swaps between them depending on the heating requirements. This is a judicious approach, where the user can have “the best of both worlds”.

Are rebates or grants available for Worcester Bosch air pumps?

A: VAT was removed from heat pumps in April 2022. The Boiler Upgrade Scheme grant funds replacing boilers with heat pumps. Regional authorities also have incentives, depending on where you live.

Can I keep my existing radiators with a heat pump?

A: Unless the radiators have already been oversized they will probably have to be replaced by larger ones to ensure sufficient hot water delivery from a heat pump.

Is it possible to retrofit heat pumps into older homes?

A: Most manufacturers would say yes to this question; recently Bosch has outlined potential issues, for example, of space available and insulation in older British properties: so a careful assessment of practicability is necessary before purchasing in some residences.

Worcester Bosch Heat Pump Summary

Worcester Bosch air-to-water heat pumps not only look stylish in their design and operation, but they have also received Quiet Mark accreditation. Noise is a significant factor in consumer approval and these quiet units will satisfy discerning users.

Heat pumps tend to be quite reliable in operation, but the short warranty is a concern. Obviously, consumers can pay to extend this to seven years for better peace of mind.

The Bosch brand name is a big plus point and the heat pumps have got a good deal of positive feedback, so together with their reasonable price, are a prime choice for customers looking for a green heating solution.

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Ollie Creevy
Ollie has been writing content online about home improvements for over 3 years. With a real interest and in-depth knowledge of heat pumps and ECO home improvement measures you can use to save on your energy bills. Ollie also keeps up to date with all the Government grants available for you to take advantage of like ECO4 and the Boiler Upgrade Scheme.