Greenstar Heatslave II overview

Our Greenstar Heatslave II boiler is the UK's most popular oil combi boiler.

This boiler has a sleek, modern design and is suitable for small, medium and large sized homes with one or two bathrooms.

  • Precise heating and hot water control
  • Smart modern design with controls concealed in a drawer
  • A range of models to meet the needs of smaller homes as well as two bathroom properties
  • Suitable for kitchen installation - fits underneath a standard kitchen worktop
  • Compatible with a range of optional controls for greater efficiency and comfort
  • Works with water heated by green sources such as solar energy and wood fired boilers for increased efficiency.
  • Eco hot water mode saves energy

  • Contact one of our installers and be in with a chance to win £400 worth of Bosch appliances. Terms
Greenstar Heatslave II Greenstar Heatslave II
Greenstar Heatslave II Greenstar Heatslave II
Download ErP Data Sheet

This efficiency rating icon is for a product within a range of products. View all products in this range

Technical Details

Greenstar Heatslave II 12/18 Greenstar Heatslave II 18/25 Greenstar Heatslave II 25/32
ErP Efficiency Rating
B
A
B
A
B
A
ErP Data Sheet ErP Data Sheet ErP Data Sheet ErP Data Sheet
Solar Compatible
Control Options
Central heating output (kW) 18 25 32
Dimensions (mm) height x width x depth 855 x 520 x 600 855 x 520 x 600 855 x 520 x 600
Hot water flow rate (litres per minute) 15 18 22

Related documents

  • Greenstar 12-32 Heatslave II Combi Internal ErP Operating Instructions Manufactured after 01.09.14

Frequently Asked Questions

Question
Can I use artificially softened water in the heating circuit with my boiler?
Can Worcester products be used with underfloor heating?
Should I turn my oil boiler off when my oil tank is being filled?
What can cause an oil boilers burner to lockout?
Should I have my heating system treated or cleansed?
The heating system is constantly losing pressure what should I do?
What is pluming?
Will I receive anything in writing when I have a new boiler installed?
What sort of shower can I run off my combi boiler?
Why is the hot water produced by my combi boiler sometimes cloudy?
What are timers, programmers and programmable room thermostats?
How could mains water pressure affect my combi boiler?
Do you recommend treatment of the central heating water?
How does part L of the Building Regulations affect my boiler installation?
What do the error symbols mean on my boiler?
What is ErP?
What is Energy Labelling?
Under ErP, what about systems that contain different products?
How do controls affect ErP?
My new Greenstar oil boiler's flue overheat thermostat keeps tripping out
What is a thermostatic radiator valve (TRV)?
Why might I want to programme hot water times with my combi boiler?
Can I use third party controls with your boilers?
What do the error symbols mean on my boiler?
What do the error symbols mean on my boiler?
Why might I want to programme hot water times with my combi boiler?
Can I use artificially softened water in the heating circuit with my boiler?
Find answer to more frequently asked questions

Find a local installer

Each heating system needs custom designing. By using the search feature, you can find and contact a Worcester Accredited Installer in your area to book a home visit.

After calculating the best system for your home, your installer will then come and visit you at home to assess your heating and hot water needs and give you a free estimate.

  • Contact one of our installers and be in with a chance to win £400 worth of Bosch appliances. Terms