Greenstar Heatslave Oil Combi Boiler Models

Combi boilers are the most popular heating and hot water solution in the UK. Over 15 million have been fitted across the country and they are now the preferred choice for most householders and installers. Worcester was the pioneer of the combi boiler in the UK, with the Greenstar range developed to suit virtually all homes.

All Worcester Greenstar oil combis are designed and manufactured to provide high levels of performance and operating efficiency. This is achieved through features such as the ‘keep hot’ facility (which ensures hot water is almost instantly available) and the Heatslave II’s in-built thermal store which enables the boiler to provide instant hot water for prolonged periods.

What is a thermal store?

A thermal store is a small tank integrated in the Greenstar Heatslave II combi, with the store containing the same water that is found in your radiators. By storing heat within the hot water store, the Heatslave II can instantly heat (via a heat exchanger) the cold water that enters the boiler and then passes to your hot tap or shower, increasing your hot water comfort.

Greenstar Heatslave II Range

The Worcester 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.

Key benefits of the Worcester Greenstar Heatslave II:

  • 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

Fitted from £4072 Inc. VAT

ENQUIRE TODAY
Greenstar Heatslave II 12/18 Greenstar Heatslave II 18/25 Greenstar Heatslave II 25/32
ErP Efficiency Rating – Water Heating B B B
ErP Efficiency Rating – Space Heating A A A
ErP Data Sheet

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet
Solar Compatible  Yes  Yes  Yes
Control Options  Yes  Yes  Yes
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 35°c ∆T (litres per minute) 15 18 22

Greenstar Heatslave II External Range

The Worcester Greenstar Heatslave II External boiler boasts the same features as the internal model.

This boiler is suitable for small, medium and large sized homes with one or two bathrooms and is installed outside which frees up space within your home. The boiler is contained in a cabinet that’s robust and which protects the boiler against all weathers.

Key benefits of the Worcester Greenstar Heatslave II External boiler:

  • Precise heating and hot water control
  • Green powder coated cabinet blends in with your garden and protects the boiler from the elements
  • A range of models to meet the needs of smaller homes as well as two bathroom homes
  • 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
  • Controls concealed in a drawer
  • Inbuilt frost protection

Fitted from £4245 Inc. VAT

ENQUIRE TODAY
Greenstar Heatslave II 12/18 Greenstar Heatslave II 18/25 Greenstar Heatslave II 25/32
ErP Efficiency Rating – Water Heating B B B
ErP Efficiency Rating – Space Heating A A A
ErP Data Sheet

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet
Solar Compatible  Yes  Yes  Yes
Control Options  Yes  Yes  Yes
Central heating output (kW) 18 25 32

Dimensions (mm) height x width x depth
950 x 640 x 770 950 x 640 x 770 950 x 640 x 770
Hot water flow rate 35°c ∆T (litres per minute) 15 18 22

New Oil Boiler Special Offer

For a limited time period, when you buy any new oil boiler, we’re offering your first year’s service worth £120 (inc.VAT) absolutely FREE.

Contact us today to get your quote and find out more.

ENQUIRE TODAY