Greenstar Heatslave II External Combi Boilers UK

Rapid comfort – Hot water without waiting

Quiet – Enjoy the peace, quiet in operation

Space saving – Choose to fit outside for extra space

Estimated Cost

Greenstar Heatslave II External 12/18 (2022+)

ErP Efficiency Rating: B / A

Fuel Type: Oil

Control Options: EasyControl compatible

Solar Compatibility: Yes

Central Heating Output: 18 kW

Hot Water Flow Rate: 15 l/min

Dimensions (HxWxD): 950 x 640 x 770 mm

ErP Data Sheet: Available
💡 Best suited for smaller homes, delivering efficient heating and hot water on demand.

Greenstar Heatslave II External 18/25 (2022+)

ErP Efficiency Rating: B / A

Fuel Type: Oil

Control Options: EasyControl compatible

Solar Compatibility: Yes

Central Heating Output: 25 kW

Hot Water Flow Rate: 18 l/min

Dimensions (HxWxD): 950 x 640 x 770 mm

ErP Data Sheet: Available
💡 A versatile choice for medium-sized homes, offering reliable heating and strong hot water flow.

Greenstar Heatslave II External 25/32 (2022+)

ErP Efficiency Rating: B / A

Fuel Type: Oil

Control Options: EasyControl compatible

Solar Compatibility: Yes

Central Heating Output: 32 kW

Hot Water Flow Rate: 22 l/min

Dimensions (HxWxD): 950 x 640 x 770 mm

ErP Data Sheet: Available
💡 Perfect for larger households, ensuring powerful heating and an excellent hot water supply.

High Efficiency (A-rated)

Compact Utility Design

Wide Output Range

Renewable Ready

How it Works – Simple, Fast & Hassle-Free

Answer a few quick questions about your home and energy needs.

Choose the perfect renewable solution from tailored options we recommend.

Expert installers ensure a fast, professional, and reliable setup.

How long do Worcester Bosch boilers last?

With regular servicing and maintenance, a Worcester boiler typically lasts 12–15 years. Some can last even longer if well maintained.

What types of boilers does Worcester Bosch offer?

Worcester Bosch manufactures:

Combi Boilers – For instant hot water and heating, no tank required.
System Boilers – Require a cylinder for hot water storage.
Regular (Conventional) Boilers – Work with tanks and are ideal for older systems or larger properties.

How energy efficient are Worcester Bosch boilers?

Most modern Worcester boilers have an A-rated ErP efficiency (over 90%). This helps reduce energy bills and carbon footprint compared to older G-rated boilers.

How often should I service a Worcester Bosch boiler?

You should service your boiler once a year. Annual servicing ensures it runs safely, maintains efficiency, and keeps your manufacturer warranty valid.

Solar Panels

Battery Storage

Solar installation

Buy New boiler

Replace your old boiler

Boiler repair

Ev Charger

Battery Storage

Ev charger installation