Worcester Bosch Greenstar Heatslave II 25/32 Combi Oil Boiler

Written by James Murfin
Updated on 2nd November 2026
Posted on 25th August 2026
Topic: Uncategorised
Worcester Bosch Greenstar Heatslave II 25/32 Combi Oil Boiler
Greenstar Heatslave II 25/32 Combi Oil Boiler
Total Cost
£3,650 – £4,150
Manufacturer Worcester Bosch
Boiler Model Greenstar Heatslave II 25/32 Combi Oil Boiler
Condensing boiler? Condensing
Energy Efficiency Rating 91%
Energy Band A Rated
LPG model/Conversion kit No
Manufacturer Warranty Up to 5 Years
Heating Output 32 kW
Wall Mounted or Floor Standing Floor Standing
DHW Flow Rate 22 l/m
Total Cost £3,650 – £4,150
ERP Rating A Heat B water
Hot Water Max Output 32 kW

Product Description

The Greenstar Heatslave II 25/32 Combi Oil Boiler from Worcester Bosch is a condensing unit with an efficiency rating of 91%. The efficiency rating of a boiler is how much energy is lost during the process of producing heat and hot water. The higher the energy rating, the more efficient the boiler is. The Greenstar Heatslave II 25/32 Combi Oil Boiler is A Rated, meaning it will help keep your carbon footprint down and save you money on your energy bills.

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This Floor Standing boiler has a maximum central heating output of 32 kW and a domestic flow rate of 22 l/m. Unsure what size of boiler you need to cope with the hot water and central heating demands for your home? Complete our instant quote below or read our guide on how to pick the right size boiler for your home.

The Worcester Bosch Greenstar Heatslave II 25/32 Combi Oil Boiler comes with a parts and labour warranty of Up to 5 Years, providing you with peace of mind in the unlikely event that something happens to go wrong with the boiler.

 

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What kind of fuel does your boiler use?

Mains Gas

LPG

Oil

 

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We use our own Gas Safe installers and the best installers the UK has to offer. Every single one is Gas Safe registered and has been thoroughly vetted.

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Written by
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James Murfin Job Title
Posted on: 25th August 2026
Topic: Uncategorised

James Murfin is Boiler Central's technical gas engineer. He writes and checks our guides to help homeowners choose, fit and look after their gas boiler.

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