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Bosch Compress 7000i AW 8kW

Heat Pumps

Bosch Compress 7000i AW 8kW

Solid mid-market option with a familiar brand and competitive pricing. Good SCOP and a straightforward install profile.

7.6
Great

~£13,000 installed (after £7,500 BUS grant: ~£5,500)

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How it scores

Efficiency (SCOP)(35%)
7.5/10
Noise level(15%)
7.0/10
Install simplicity(15%)
8.5/10
Warranty(15%)
6.0/10
Value(20%)
8.5/10

Scores based on published manufacturer specifications and weighted criteria — not lab testing. Methodology.

Specifications

SCOP
4.9
Type
air-source
Noise level
48
Heat output
8
Refrigerant
R410A
Warranty
5
BUS grant eligible
Yes

What I noticed

The Bosch Compress 7000i AW (9 OR-S) is a solid performer that trades at the value end of the premium bracket. It doesn’t lead in any single metric but is competitive across most of them — a reasonable choice for homeowners who want a recognisable brand and a straightforward installation without paying top-of-market prices.

Who it suits

Budget-conscious buyers who aren’t willing to compromise on brand trust. Bosch’s UK installer network is large, and spares availability is good.

Watch for

This is the original OR-S generation, which runs on R410A — a high-GWP refrigerant that newer models (and Bosch’s own R290 ORE/ORM variants) have moved away from. It posts a strong SCOP of 4.9 at the 35°C low-temperature rating, but efficiency drops to a seasonal figure of around 3.7 at the 55°C flow temperatures older radiators often need, and the unit is capped at a 60°C flow temperature. If you have an existing high-temperature radiator system, weigh that flow-temperature ceiling carefully.

Sources — verified 4 June 2026

  1. Worcester Bosch, “Compress 7000i AW CS7001iAW 9 OR-S — ErP product fiche” — worcester-bosch.co.uk
  2. Bosch, “Compress 7000i AW — Installation manual (technical specifications)” — manualslib.com

Compress 7000i AW 8kW head-to-heads

Side-by-side scoring vs each alternative in our shortlist.

vs

Daikin Altherma 3 R 8kW

Compare specs, scores, and verdict.

vs

Worcester Bosch Compress 7000i AW 8kW

Compare specs, scores, and verdict.

vs

Vaillant arotherm plus 8kW

Compare specs, scores, and verdict.

Other Heat Pumps on my shortlist

Daikin Altherma 3 R 8kW
7.9

Daikin Altherma 3 R 8kW

Compact monobloc design with integrated controls. One of the tidier-looking units on the market, with a well-regarded app and strong SCOP.

~£14,200 installed (after £7,500 BUS grant: ~£6,700)

Worcester Bosch Compress 7000i AW 8kW
8.1

Worcester Bosch Compress 7000i AW 8kW

Worcester Bosch air-source heat pump with R290 refrigerant. Familiar brand to UK homeowners, large installer network, and a competitive 7-year warranty.

~£13,800 installed (after £7,500 BUS grant: ~£6,300)

Vaillant arotherm plus 8kW
8.5

Vaillant arotherm plus 8kW

German-engineered ASHP with A+++ energy rating and among the lowest noise outputs in class at 46dB(A). Eligible for the Boiler Upgrade Scheme grant.

~£14,500 installed (after £7,500 BUS grant: ~£7,000)

Read next

Background reading and decision-tree pages that put this product in context.

Warm Homes Plan & the £7,500 BUS grant

Eligibility, the application route, and how the grant fits a heat-pump quote.

Stage 2: What could you actually save?

How a heat pump shifts the gas-vs-electric cost balance with solar.

Solar panel cost UK 2026

How solar pairs with a heat pump to lower the running-cost gap vs gas.