Quick Buying Guide to 3 Best Worcester Bosch Greenstar Danesmoor Utility Boilers Reviews and Comparison
The Greenstar Danesmoor Utility Regular by Worcester Bosch is an oil-fired conventional boiler which requires a feeder tank and hot water cylinder.
It is available in outputs of 18kW, 25kW and 32kW and its dimensions measure 855mm (H) 370mm (W) x 600mm (D). By being a slim floor-standing appliance, this boiler is ideal for keeping in your kitchen or utility room and will fit neatly under a worktop and between your cabinets or white goods.
As there are three outputs in the series, the boiler is a great choice for small, medium, and even large-sized homes where a lot of hot water is used at the same time. Prices start at £1,400.00 and go up to £1,866.93, and the boiler comes with a standard 2-year warranty. We can help you with our three best findings available:
- Worcester Bosch Greenstar Danesmoor Utility 12/18 Regular Oil Boiler– The Greenstar Danesmoor Utility 12/18, designed and manufactured by Worcester Bosch, is an oil-fired regular boiler with an output rating of 18 kW.
- Worcester Bosch Greenstar Danesmoor Utility 18/25 Regular Oil Boiler– Designed and manufactured by Worcester Bosch, the Greenstar Danesmoor Utility 18/25 is a regular boiler that runs on oil, perfect for off-grid properties.
- Worcester Bosch Greenstar Danesmoor Utility 25/32 Regular Oil Boiler– The Greenstar Danesmoor Utility 25/32, designed and manufactured by Worcester Bosch, is a regular oil boiler with a powerful output rating of 32 kW.
Name Our Rating Availability Price Efficiency Ratings
Worcester Bosch Greenstar Danesmoor Utility 12/18 Regular Oil Boiler | 8.8/10 | YES | £1,446 | 90% |
Worcester Bosch Greenstar Danesmoor Utility 18/25 Regular Oil Boiler | 8.7/10 | YES | £1,553 | 90% |
Worcester Bosch Greenstar Danesmoor Utility 25/32 Regular Oil Boiler | 9.2/10 | YES | £1,947 | 91% |
Worcester Bosch Greenstar Danesmoor Utility 12/18 Regular Oil Boiler
As one of the most established within the Greenstar range, the Danesmoor oil-fired boiler brand has proven itself as one of the most reliable on the market.
The Danesmoor Regular Boiler has been enhanced to offer compliance with the efficiency requirements of the ErP Directive policy, and actually exceeds the efficiency requirements. This is achieved with a smaller, much more efficient primary heat exchanger, and an upgraded secondary heat exchanger.

Advantages:
- Awarded Which? Best Buy with a score of 87%
- Can be installed in a kitchen, garage or utility room
- Suited to small, medium and large homes without a mains gas supply
Disadvantage:
- Requires separate cylinder and loft tanks
Features:
- 5-year boiler guarantee until 31st December 2015 when installed with a Worcester Greenstar System Filter (terms and conditions apply)
- Cross firing burner
- Single piece primary baffle
- Inspection hatch for easy access
- Output for central heating 12-18kW
- Can be run on a low temperature system
- Suitable for underfloor heating
- New primary heat exchanger incorporating a one piece baffle for quick and easy servicing
- Oil and hydraulic connections within the boiler cabinet are positioned for easy access based on installer feedback and provides an aesthetically pleasing exterior
- Weight has been reduced by up to 17kg compared to the equivalent Greenstar Camray boiler
- 80/125mm room sealed flues with lengths of up to 8m and plume management of up to 5m. Conventional and flexi-flue kits also available
- Available in Kitchen, Utility, or External models
Product Key Specifications:
Name | Worcester Greenstar Danesmoor Utility 12/18 Regular Boiler Oil ErP+ – 7731600147 |
Product Code | 175638 |
MPN | 7731600147 |
EAN | 4057749656681 |
Type | Oil Boiler |
Sub Type | Regular Boiler |
Colour | White |
Warranty (Years) 2
Width (mm) 370
Height (mm) 855
Depth (mm) 600
Weight (Kg) 86
Output (Kilowatts) 18
Output (BTUs) 61500
ErP Space Heating Efficiency A
Fuel Oil
Mounting Floor
Worcester Bosch Greenstar Danesmoor Utility 18/25 Regular Oil Boiler
As one of the most established within the Greenstar range, the Danesmoor oil-fired boiler brand has proven itself as one of the most reliable on the market.
The Danesmoor Regular Boiler has been enhanced to offer compliance with the efficiency requirements of the ErP Directive policy, and actually exceeds the efficiency requirements. This is achieved with a smaller, much more efficient primary heat exchanger, and a upgraded secondary heat exchanger.

Advantages:
- Extremely quiet in operation
- Provides maximum energy efficiency – reduce fuel bills and carbon emissions
- Compatible with solar thermal – additional savings
Disadvantage:
- User controls are basic
Features:
- Exceeds requirements of ErP Directive
- Cross firing burner
- 5-year guarantee on Worcester primary heat exchanger
- Heating outputs from 18 to 32kW
- Can be run on a low-temperature system
- New primary heat exchanger incorporating a one-piece baffle for quick and easy servicing
- Compatible with solar thermal
- Lightweight aiding installation
- 80/125mm room sealed flues with lengths of up to 8m and plume management of up to 8m. Conventional and flexi-flue kits also available
- Available in Kitchen, Utility, or External models
Product Key Specifications:
Name | Worcester Greenstar Danesmoor Utility 18/25 Regular Boiler Oil ErP+ – 7731600151 |
Product Code | 172790 |
MPN | 7731600151 |
EAN | 4057749656728 |
Type | Oil Boiler |
Sub Type | Regular Boiler |
Colour | White |
Warranty (Years) | 2 |
Width (mm) | 370 |
Height (mm) | 855 |
Depth (mm) | 600 |
Weight (Kg) | 89 |
Output (Kilowatts) | 25 |
Output (BTUs) | 85000 |
ErP Space Heating Efficiency | A |
Fuel | Oil |
Mounting | Floor |
Worcester Bosch Greenstar Danesmoor Utility 25/32 Regular Oil Boiler
As one of the most established within the Greenstar range, the Danesmoor oil-fired boiler brand has proven itself as one of the most reliable on the market.
The Danesmoor Regular Boiler has been enhanced to offer compliance with the efficiency requirements of the ErP Directive policy, and actually exceeds the efficiency requirements. This is achieved with a smaller, much more efficient primary heat exchanger, and an upgraded secondary heat exchanger.

Advantages:
- 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
Disadvantage:
- 2-year warranty – would prefer a longer standard guarantee
Features:
- 5-year boiler guarantee until 31st December 2015 when installed with a Worcester Greenstar System Filter (terms and conditions apply)
- Cross firing burner
- Single piece primary baffle
- Inspection hatch for easy access
- Output for Central Heating 25-32kW
- Can be run on a low temperature system
- Suitable for underfloor heating
- New primary heat exchanger incorporating a one-piece baffle for quick and easy servicing
- Oil and hydraulic connections within the boiler cabinet are positioned for easy access based on installer feedback and provides an aesthetically pleasing exterior
- Weight has been reduced by up to 17kg compared to the equivalent Greenstar Camray boiler
- 80/125mm room sealed flues with lengths of up to 8m and plume management of up to 5m. Conventional and flexi-flue kits also available
- Available in Kitchen, Utility, or External models
Product Key Specifications:
Name | Worcester Greenstar Danesmoor Utility 25/32 Regular Boiler Oil ErP+ – 7731600155 |
Product Code | 172797 |
MPN | 7731600155 |
EAN | 4057749656766 |
Type | Oil Boiler |
Sub Type | Regular Boiler |
Colour | White |
Warranty (Years) | 2 |
Width (mm) | 370 |
Height (mm) | 855 |
Depth (mm) | 600 |
Weight (Kg) | 93 |
Output (Kilowatts) | 32 |
Output (BTUs) | 109000 |
ErP Space Heating Efficiency | A |
Fuel | Oil |
Mounting | Floor |
BUYING GUIDE- Worcester Bosch Greenstar Danesmoor Utility Boilers
Given below is a detailed guide on Worcester Bosch Greenstar Danesmoor Utility Boilers:
Does this Boiler have a Good Range of Controls and Features?
This boiler doesn’t have the largest selection of user controls but the ones it does have are concealed behind a panel to ensure the boiler won’t look out of place when installing next to other kitchen or utility room appliances. When it comes to features, the Greenstar Danesmoor Utility Regular has an efficient primary heat exchanger and an upgraded secondary heat exchanger to enable the boiler to exceed ErP efficiency requirements. It also has an inspection hatch for easy access and a one-piece baffle to ensure annual services can be carried out quickly. Furthermore, this model is Bosch EasyControl compatible to enable you to monitor your energy use and manage your heating and hot water from a smartphone or tablet.
Is it a High Efficiency Boiler?
It sure is. The Greenstar Danesmoor Utility Regular is an A-rated floor-standing oil boiler with a seasonal space heating energy efficiency rating of 90%. If you decide to swap an old oil-fired regular boiler for this model, you’ll not only cut your fuel bills but also dramatically reduce your carbon footprint. But that’s not all. This boiler is compatible with Greenskies solar panels and Greenstore cylinders which, when used together, can provide around 60% of your home’s hot water and save you some serious cash.
How long is the Warranty on this Boiler?
All Worcester Bosch oil-fired boilers come with a 2-year parts and labour warranty as standard, which is what you’ll get with the Greenstar Danesmoor Utility Regular. In the past, Worcester Bosch has offered extended 5-year promotional warranties on oil-fired boilers, so be sure to check the brand’s website.
How will I know if this Boiler is Suitable for My Home?
Because it’s a regular boiler (also called a conventional, traditional or heat only boiler), the Worcester Bosch Greenstar Danesmoor Utility Regular is most suited to homes where a separate hot water storage cylinder and cold-water tanks in the loft are already installed. Regular boilers are also ideal for properties with multiple bathrooms and high hot water demands. As this particular model comes in three heat outputs of 18kW, 25kW and 32kW, it’s suitable for small, medium and large homes.
The highest output option is designed for properties with greater demands, whereas the lowest is intended for homes with smaller needs. But how can you know for sure? It’s pretty much impossible to select the right oil boiler output for your house without consulting an OFTEC registered engineer. A qualified engineer will need to assess your property and requirements in order to recommend the perfect boiler type and output for your household.
What do Industry Experts have to Say?
In the Which? October 2018 Survey our entire range of boilers came out top. Scoring top marks for reliability and customer satisfaction. Our boilers also received a five-star recommendation score from Which? Trusted Traders heating engineers, who say:
“Its reliability is excellent. The customer service and culture is first class and their technical helpline is brilliant. It also has fantastic quality of build.”
Homeowners also highly recommend our boilers with Which?, commenting: “Worcester Bosch is the best boiler brand out there, based on the results of our latest survey. Its boilers are well loved by those who own them.”
Modern heating systems can be complex and sophisticated, and because every home is slightly different, we always recommend speaking to a qualified heating installer. There are three straightforward ways to find local professional installers:
The internet
You can do a general search for local OFTEC registered installers on the internet. Some might have a showroom, giving you the opportunity to meet them first before you make a home visit appointment. For your peace of mind, all OFTEC registered installers carry an ID card, which you should ask to see when they arrive.
OFTEC registered installers
You can search for OFTEC registered installers on the OFTEC website at oftec.co.uk. You can find local professionals by entering your postcode. This will allow you to check individuals and companies to see if they are registered and includes information on what OFTEC registered engineers are and why it’s important to use them.
Worcester Accredited Installers
Worcester Accredited Installers are installation companies that we consider to be reputable, quality conscious and provide value for money. They must have attended our training courses and hold all the required approvals for carrying out work at your home, such as Gas Safe or OFTEC accreditation, before we list them. As well as advising, installing and providing servicing and maintenance, some also offer extended guarantees on our products. To find a local Worcester Accredited Installer simply go to the ‘Find an Installer’ page at worcester-bosch.co.uk and enter your postcode.
https://www.worcester-bosch.co.uk/support/literature/download/8716110393
Construction and Material:
- Floor standing oil-fired condensing boiler
- Literature pack:
Greenstar Danesmoor Installation, Commissioning and Servicing
Instruction manual
User Instructions
Fascia information card
Guarantee registration card
- BSP plug, one inch (Regular only)
- ErP label
Primary system plastic pipework:
Any plastic pipework used for the CH system must have a polymeric
barrier, complying with BS 7921 and installed to BS 5955 with
1000mm (minimum) length of copper or steel pipe connected to the
boiler.
• Plastic pipework used for underfloor heating must be correctly
controlled with a thermostatic blending valve limiting the
temperature of the circuits to approximately 50°C with 1000mm
(minimum) length of copper or steel pipe connected to the boiler,
and a 20K differential must be maintained at the appliance.
Primary system/connections/valves:
Do not use galvanized pipes or radiators.
• All system connections, taps and mixing valves must be capable of
sustaining a pressure of 3 bar.
• Radiator valves should conform to BS 2767:10.
• All other valves should conform to BS 1010.
• An automatic bypass valve must be connected between the heating
flow and return where TRVs are used on all radiators, fitted to give at
least a 3 meter circuit when activated.
• Drain cocks are required at all the lowest points on the system.
• Air vents are required at all high points on the system.
Open vent primary system (Regular only)
• The open vent pipe and feed and expansion pipe must rise
continuously from the appliance.
• The feed and expansion cistern must be positioned to provide a
static head of at least 1 meter above the highest point in the
heating system to the water level in the feed and expansion cistern.
• Ensure adequate space is left in the expansion cistern for expansion
of the system water.
• No valve shall be fitted in the open vent pipe or the feed and
expansion pipe.
• The open vent pipe must be at least 22mmO.
Fully pumped sealed primary system:
• A pressure relief valve, spring loaded safety valve set to operate
at 3bar, must be fitted to the heating flow pipe as close as possible to
the boiler or onto one of the boilers top 1” BSP outlets.
• An expansion vessel must be fitted to the heating return pipe as
close as possible to the boiler and pressurized for the system volume
according to the instructions supplied with the vessel.
• A pressure gauge, 3 bars minimum, must be fitted to the heating
flow pipe or one of the boilers 1” BSP outlets.
• An automatic air vent must be fitted.
Research & methodologies used behind the in-depth analysis of Worcester Bosch Greenstar Danesmoor Utility Boilers:
Ideal for small to large size homes
Highly efficient
Quiet in operation
Compatible with Worcester Bosch Greenskies solar and Worcester Bosch Greensource air to water heat pumps for greener, lower-cost hot water, and heating.
Greenstar Utility (High Output) series
The Greenstar Utility series has been designed to provide a high output energy efficient solution for large homes and light commercial properties. They are intended for installation in a utility area or a dedicated plant room.
Ideal for homes with a high heating and hot water requirement
Highly efficient
Quiet in operation
Compatible with Worcester Bosch Greenskies solar and Worcester Bosch Greensource air to water heat pumps for greener, lower-cost hot water, and heating.
Greenstar Danesmoor External series
The Greenstar Danesmoor External series is an ideal choice for homes where indoor space is at a premium. Available in a wide range of central heating outputs, the boilers perfectly meet the needs of smaller, medium and larger properties.
All the same performance features as the Danesmoor internal models plus:
A robust external cabinet design ensures full weatherproofing
IP45 Ingress Protection ensures high performance even in harsh weather conditions
Added protection against freezing
Compatible with Worcester Bosch Greenskies solar and Worcester Bosch Greensource air to water heat pumps for greener, lower cost hot water and heating.
https://www.worcester-bosch.co.uk/support/literature/download/release/6720813286/12577

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.gumtree.com%2Fp%2Fplumbing-central-heating%2Fworcester-bosch-oil-boiler-greenstar-danesmoor-utility-18-25.%2F1386465124&psig=AOvVaw3EEGY_06zopH5Cf0cqD3yu&ust=1606722431623000&source=images&cd=vfe&ved=2ahUKEwiggcvPoaftAhXg6zgGHYWBCQQQjRx6BAgAEAc
This was installed in Jan 2020 by previous owner, it has consequently hardly been used as the house was left empty over winter.
Top Reviews:
Name: WillowX
Date and Time: 15/08/2017 at 11:05 am
Feedback in Detail:
I’ve no probs with these boilers. Seem to work just fine.
Date: 29/11/2020
Feedback in Detail:
Since having our new Worcester boiler fitted, we have noticed dramatic difference in the heat our radiators give off and how quickly they heat up. Also the difference in how fast and hot our water gets now. Overall, very happy with the boiler.
Date: 28/11/2020
Feedback in Detail:
Very pleased with our boiler thank you.
Date: 27/11/2020
Feedback in Detail:
the boiler was recommended by my local installer and what good choice he made for us the boiler is super-efficient very smart appearance and quiet, fitted in no time at all.
Date: 27/11/2020
Feedback in Detail:
It’s been a year since boiler was installed. Have to admit it was a good investment I can use my phone app to control my heating even when I’m not at home ,it’s nice to come home and be warm and cozy i can set the temperature in advance but can adjust I find now I can turn the temperature down as find the house gets to warm. Anyone thinking of changing their boiler updating their system just do it glad i did.
https://uk.trustpilot.com/review/www.worcester-bosch.co.uk?stars=5&aspects=boiler
FAQs:
Q: How efficient is the Greenstar Danesmoor Utility 12/18?
A: Danesmoor Utility boilers could help to save you money on your energy bills thanks to an efficiency rating of 90% and ErP A-rating.
Q: Is an 18-kW output rating suitable for my home?
A: An output rating of 18 kW is perfect for smaller properties with a single bathroom and 10-15 radiators.
Q: Does the Greenstar Danesmoor Utility range include any other output ratings?
A: The output rating of 18 kW is the lowest in the range so if you live in a larger property then 25 kW and 32 kW models are also available.
Q: Is a regular boiler suitable for my home?
A: A regular boiler is suitable for installation in properties with an open vent heating system. This means that the water heated by the boiler is delivered via a cold-water tank in the loft which is then heated and stored in a hot water cylinder.
Q: How long is the warranty?
A: The Danesmoor Utility 12/18 has a standard 2-year warranty which can be extended to 5 years when certain terms and conditions are met.
Q: What are the key features of the Danesmoor Utility 12/18?
A: Greenstar Danesmoor Utility 12/18 boilers have concealed controls, which adds towards a modern finish, and they’re compatible with Greenskies solar panels.
Q: How big is the Greenstar Danesmoor Utility 12/18?
A: Thanks to compact dimensions of 855 x 370 x 600mm (HxWxD), the Danesmoor Utility is perfectly suited for installation in a kitchen or utility room.
Q: How efficient is the Greenstar Danesmoor Utility18/25?
A: With an efficiency rating of 90% and ErP A-rating for heat, the Danesmoor Utility is a great way to reduce your heating bills.
Q: Is a 25-kW output rating suitable for my home?
A: The output rating of 25 kW is suitable for medium-sized properties with 2-3 bedrooms, 10-15 radiators, and 1-2 bathrooms.
Q: Does the Greenstar Danesmoor Utility range include any other output ratings?
A: In addition to this 25-kW model, Danesmoor Utility boilers are available in a lower output rating of 18 kW and a more powerful 32 kW.
Q: Is a regular boiler suitable for my home?
A: Regular boilers should be installed into properties with an open vent heating system. Homes heated in this way have a cold-water tank in the loft which delivers water to the boiler through a pipe via gravity to then be stored in a hot water cylinder once heated.
Q: How long is the warranty period?
A: The Danesmoor Utility 18/25 has a 2-year warranty as standard which can be extended to 5 years under certain conditions.
Q: What are the key features of the Danesmoor Utility 18/25?
A: The Danesmoor Utility 18/25 is an easy-to-use boiler with concealed controls. Plus, if you’re interested in renewable energy then it’s fully compatible with Greenskies solar panels.
Q: How big is the Greenstar Danesmoor Utility 18/25?
A: Greenstar Danesmoor Utility 18/25 boilers have dimensions of 855 x 370 x 600mm (HxWxD) which makes this a compact boiler that can be installed under a standard kitchen worktop.
Q: How efficient is the Greenstar Danesmoor Utility 25/32?
A: Thanks to the high-efficiency rating of 91% and ErP A-rating for heat, the Danesmoor Utility 25/32 could help to save you money on your energy bills.
Q: Is a 32-kW output rating suitable for my home?
A: A regular boiler with an output rating of 32 kW, the Danesmoor Regular 25/32 is best suited to larger homes with 2-3 bathrooms and 15-20 radiators.
Q: Does the Greenstar Utility range include any other output ratings?
A: This is the most powerful boiler in the Greenstar Danesmoor Regular range of boilers. Should you need a lower output than 18 kW and 25 kW models are available too.
Q: Is a regular boiler suitable for my home?
A: Regular boilers are suitable for properties with an open vent heating system. Homes heated in this way have a cold-water tank in the loft which sends cold water to the boiler through a pipe, via gravity, to be heated and then stored in a hot water cylinder.
Q: How long is the warranty?
A: The Danesmoor Utility 25/32 comes with a standard 2-year warranty which you’ll have the option to extend to 5 years under certain terms and conditions.
Q: What are the key features of the Danesmoor Utility 25/32?
A: Danesmoor Utility regular boilers have a number of key features including concealed heating controls, compatibility with Greenskies solar panels and Greenstore cylinders.
Q: How big is the Greenstar Danesmoor Utility 25/32?
A: Dimensions of 855 x 370 x 600mm (HxWxD) make this a compact boiler that can be installed in a kitchen or utility room.
DID YOU KNOW?
- Worcester Bosch’s Greenstar Danesmoor Utility Regular is 90.7% efficient and an Energy Saving Trust endorsed boiler with a SEDBUK rating of ‘A. ‘ This means the boiler has the ability to lower your energy bills and reduce your carbon footprint.
- “Our boilers are designed to last for between 12 and 15 years and the failure of durable components after just two years is normally down to outside influences.”
https://www.theguardian.com/money/2013/sep/23/worcester-bosch-boiler-broke-warranty
- Worcester Bosch boilers are known for being truly built to last. Over the years, they’ve earned the trust of homeowners right across the UK and Europe. They’re manufactured with quality components and are probably my favorite brand to fit.
- The green light on a Worcester Bosch boiler typically indicates that the burner is operating properly, which is a good sign. However, sometimes the green light can go off, with the boiler still working fine.
- Worcester Bosch continues to be the best gas boiler brand. Its customers are the happiest of any brand’s customers.
https://www.worcester-bosch.co.uk/products/boilers/which-best-buys
Conclusion:
Fully compliant with the latest ErP (Energy-related Products) Directive, the Greenstar Danesmoor Utility Regular is a great choice for reducing fuel consumption and those costly energy bills. You can even improve efficiency with this one as it can work in conjunction with some of Worcester’s smart optional controls and Greenskies solar panels.
This boiler is also a safe and practical solution if you have small children because the simple to use controls have been concealed. Of course, this means you can have it installed in the kitchen or another room that sees a lot of activity without worrying that your young kids might mess about with the controls.
You will also be pleased to know that the boiler has been designed with simplicity in mind for fast and straightforward installation so it won’t take your installer long to get the appliance set up and ready for use.