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Worcester Bosch Greenstar Danesmoor External System

The Worcester Bosch Greenstar Danesmoor External System is an oil-fired boiler that is suitable for outdoor installation and designed for homes off the gas grid.

Part of Worcester Bosch’s market-leading range of boilers, the Greenstar Danesmoor External System is available in three outputs up to 32kW and is ideal for small, medium and large properties. It’s ultra-efficient, solar compatible and can be used with a selection of controls including smart thermostats. This system model has also consistently been voted a Which? Best Buy, making it one of the top rated and most recommended oil-fired boilers on the market today.

How Much Does this Boiler Cost?

Worcester Bosch’s Greenstar Danesmoor External System can be purchased with an output of 18kW, 25kW or 32kW, so you must find out which kW output you require before parting with any cash. Prices vary according to the heat output and typically start at £1,800 and rise to around £2,500 including VAT. This means the higher the output, the more expensive the boiler will be. It often pays to shop around because some suppliers offer competitive deals or are happy to beat quotes that you have obtained elsewhere.

How will I know if this Boiler is Suitable for My Home?

The Worcester Bosch Greenstar Danesmoor External System is an oil-fired system boiler. System boilers need to be installed with a separate cylinder for storing hot water and tend to be best for homes with more than one bathroom. As this system model is an oil boiler, it’s also a sensible option for those who live off the gas grid. If you have a large house and greater demands for heating and hot water, you’re probably going to need the 25kW or 32kW unit. Smaller households with lower demands should steer towards the 18kW version. You must keep in mind that this is just a rough guide, though.

If you want to know whether or not the Greenstar Danesmoor External System is the perfect solution for your home, you’ll need to get some advice from an OFTEC registered engineer. A qualified heating professional will also be able to tell you the correct heat output for your property.

Is it a High Efficiency Boiler?

Yes, it is. The Greenstar Danesmoor External System has an ‘A’ ErP efficiency rating, meaning it should help to save you money on your fuel bills. This is especially true if you currently have an old boiler model installed and decide to replace it with this efficient condensing model. Not forgetting that the boiler can be used with Worcester Bosch’s range of Greenskies solar panels and Greenstore cylinders, both of which provide additional energy and cost savings.

Does this Boiler have a Good Range of Controls and Features?

Worcester Bosch is renowned for making boilers with easy to use controls and impressive features. As for the Greenstar Danesmoor External System, it comes with inbuilt frost protection, a one-piece baffle for quick servicing and flexi-flue and plume management kits. Because the boiler must be placed outside, it’s delivered with a durable green powder coated external cabinet to ensure it is protected from the elements and blends in with the outdoor environment. Even more impressive, this model is compatible with the smart Bosch EasyControl that allows you to control your heating and hot water from a smartphone or tablet.

How long is the Warranty on this Boiler?

Whether you choose the Greenstar Danesmoor External System or another oil-fired boiler from Worcester Bosch, you’ll receive a 2-year parts and labour warranty as standard. Worcester Bosch sometimes offers extended promotional warranties on its range of oil-fired boilers, so be sure to check the brand’s website.

Greenstar Danesmoor External System Sizes and Prices

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
greenstar danesmoor external system 18SystemH – 950 mm
W – 565 mm
D – 780 mm
N/A18 kWA 90% and above£1800
greenstar danesmoor external system 25SystemH – 950 mm
W – 565 mm
D – 780 mm
N/A25 kWA 90% and above£2000
greenstar danesmoor external system 32SystemH – 950 mm
W – 565 mm
D – 780 mm
N/A32 kWA 90% and above£2500

Summary of Important Information

  • Priced between £1,800 and £2,500
  • Heating output of 18kW, 25kW or 32kW
  • Dimensions of 950mm (H) x 565mm (W) x 780mm (D)
  • Uses oil as its fuel source
  • Must be situated outside
  • A-rated for efficiency
  • Solar compatible
  • Smart compatible
  • 2-year warranty as standard

Pros and Cons

To be honest, there isn’t anything we don’t like about the Worcester Bosch Greenstar Danesmoor External System but we feel the standard warranty could be longer than just 2 years. You can find our full list of pros and cons below.


  • Awarded Which? Best Buy with a score of 87%
  • Outdoor installation – frees up space indoors
  • Suited to small, medium and large homes without a mains gas supply
  • Weatherproof cabinet
  • Extremely quiet in operation
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions
  • Compatible with solar thermal – additional savings
  • Compatible with Bosch EasyControl – can tailor hot water times and heating temperatures from your smartphone or tablet, even when you’re not at home
  • 5-year guarantee on the primary heat exchanger
  • 10-year guarantee on the plate heat exchanger


  • Requires separate cylinder
  • 2-year warranty – would prefer a longer standard guarantee
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