Worcester Bosch Compress 5800i Wall-hung Heat Pump Indoor Unit

The Worcester Bosch Compress 5800i Wall-hung Heat Pump Indoor Unit is a compact, wall-mounted indoor unit for the Compress 5800i AW air-to-water heat pump system, providing efficient space heating and domestic hot water (DHW) with integrated controls and connectivity for modern homes.

Product Description

The Compress 5800i wall-hung Heat Pump indoor unit is designed for easy integration with the outdoor unit, featuring a built-in 3kW electric heater for backup during extreme cold. This Heat Pump supports high flow temperatures up to 75°C, suitable for radiators or underfloor heating, and includes a 2.4" colour display with touch controls. With Connect-Key K30 Bluetooth/WiFi connectivity, it enables app-based commissioning and monitoring via Bosch EasyAir. This unit minimises installation complexity while delivering A+++ ErP-rated efficiency.

Key Features

• Wall-hung design: Compact for tight spaces, no pre-plumbed cylinder needed.
• Built-in backup heater: 3kW electric element for fail-safe operation in cold weather.
• High flow temperatures: Up to 75°C for compatibility with existing radiators.
• Connect-Key K30: Integrated Bluetooth/WiFi for remote control and setup.
• Quiet operation: Low noise with advanced sound management.
• ERP A+++ rated: High efficiency for reduced energy bills.
• Weather optimised: Pairs with outdoor unit for -25°C performance.
• Easy commissioning: Guided setup via app for installers.

Technical Specifications

• Model: WB-8738214990 – Compress 5800i Wall-hung Indoor Unit.
• Power supply: 230V 1ph 50Hz.
• Backup heater: 3 kW electric.
• Maximum flow temperature: 75 °C.
• ErP rating: A+++.
• Connectivity: Connect-Key K30 (Bluetooth/WiFi).
• Display: 2.4" colour with 7 touch buttons.
• Operating temperature: -25°C to +43°C (system).

Dimensions & Weights

• Width: 400 mm.
• Depth: 300 mm.
• Height: 710 mm.
• Weight: 26 kg.
• Clearances: Front min 800 mm, Rear min 200 mm, Left/Right min 400 mm, Top min 550 mm.

System & Application Notes

• Ideal for pairing with Compress 5800i AW outdoor unit in homes up to 100m².
• Compatible with radiators, underfloor heating, and low-loss headers.
• Suitable for new builds and retrofits; supports smart home integration.
• Installation by qualified MCS-certified engineers; qualifies for grants.
• 7-year warranty on indoor unit; 10-year on compressor.