Worcester Bosch Greenstar Danesmoor Review
Key Takeaways
- The Greenstar Danesmoor remains a current oil-boiler option for off-grid UK homes.
- Three output sizes are available, reaching 18kW, 25kW and 32kW.
- Danesmoor boilers carry an A rating for space-heating efficiency.
- Internal and external models provide greater flexibility when choosing an installation location.
- Eligible oil-heated homes can also compare heat pumps using enhanced BUS support.
If your home isn't connected to the mains gas grid, choosing a new heating system isn't always as straightforward as comparing the latest gas boilers.
It's not a very small number of homeowners.
The most recent government figures show that about 16% of domestic properties in Great Britain were not connected to the gas grid in 2024, whereas in the South West the figure is 24%, which is almost one in four domestic properties.
For many rural and off-grid properties, alternative heating fuels, including heating oil, remain an important part of home heating.
If you've been keeping up with the government's plans for off-grid heating over the past few years, it's reasonable to question whether buying another oil boiler still makes sense.
At one point, proposals suggested that new fossil-fuel heating systems, including oil boilers, could be phased out in existing off-gas-grid homes from 2026.
However, the proposed off-grid heating ban has changed considerably since then.
The current government has confirmed that it will not proceed with the previous proposal to introduce regulations restricting fossil-fuel heating installations in off-gas-grid properties from 2026.
And that brings us rather neatly to the Worcester Bosch Greenstar Danesmoor.
The Danesmoor remains available in the UK, including through us, and is designed specifically for homes that rely on oil heating.
But with heat pumps receiving increasing government support through the Boiler Upgrade Scheme, and the UK's heating system gradually moving away from fossil fuels, does buying a Danesmoor still make sense?
Let's take a closer look.
What Is The Worcester Bosch Greenstar Danesmoor?
The Worcester Bosch Greenstar Danesmoor is a range of oil-fired condensing boilers designed primarily for properties without access to mains gas.
Unlike the Worcester Bosch Greenstar 1000 or Greenstar 4000, which many homeowners will know as gas boiler ranges, the Danesmoor burns heating oil.
It isn't just one boiler model either.
The current range covers different outputs and installation configurations, allowing homeowners to choose between boilers installed inside or outside the property.
Worcester Bosch currently lists 12/18, 18/25, and 25/32 models, providing maximum central-heating outputs of 18kW, 25kW, and 32kW, respectively.
All three carry an A ErP efficiency rating.
That gives the Danesmoor enough flexibility to cover a fairly broad range of property sizes and heating requirements.
Can You Still Buy A Worcester Bosch Greenstar Danesmoor?
Yes.
Some older Worcester Bosch boiler names remain scattered across the internet long after the products have left current ranges.
But Worcester Bosch continues to list current 2022+ Greenstar Danesmoor models.
Currently, we stock the Greenstar Danesmoor Utility 18/25kW Internal Oil System Boiler, as well as the 12/18kW and 25/32kW versions. External regular and system Danesmoor boilers are also available.
The Danesmoor remains a current option for UK homeowners requiring an oil-fired heating system in 2026.
Danesmoor Models Explained
The Danesmoor model range is incredibly versatile. Worcester Bosch offers different installation configurations.
These differences include:
Danesmoor Utility
The Utility versions are designed for indoor installation.
The current Danesmoor System Utility models measure 855mm high, 370mm wide and 600mm deep, giving them a relatively narrow footprint. Worcester Bosch describes them as suitable for installation beneath a kitchen counter where the installation allows.
That can make the Utility particularly useful when replacing an existing internally installed oil boiler.
Danesmoor External
Don't particularly fancy giving an oil boiler valuable space inside your house?
There's another option.
The Greenstar Danesmoor External moves the boiler outside.
Current External models measure 950mm x 565mm x 780mm and incorporate frost protection intended to keep the boiler operating in harsh weather conditions.
For properties with limited internal space, that's a significant advantage.
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How Efficient Is The Worcester Bosch Greenstar Danesmoor?
Modern oil boilers have come a considerable way from the old non-condensing units still hiding in some UK homes.
Also, the Greenstar Danesmoor is a condensing oil boiler.
Jargon Buster: Condensing oil boiler
A condensing boiler is a highly efficient heating system that recovers latent heat from exhaust gases that would otherwise be lost through the flue, using this reclaimed energy to pre-heat the water returning to the boiler and significantly reducing fuel consumption.
This means it recovers additional heat from its exhaust gases rather than simply allowing that energy to escape through the flue.
The current Danesmoor range carries an A ErP rating for space heating.
We currently list the Danesmoor Utility 18/25 system boiler at around 90% efficiency.
If you're replacing an ageing boiler, the condition and efficiency of your existing system therefore matter just as much as the badge on the replacement.
Which Danesmoor Output Do You Need?
It's tempting to match boiler output directly to the number of bedrooms.
Unfortunately, houses aren't quite that cooperative.
Two four-bedroom homes can have completely different heating requirements depending on their age, insulation, construction, number of radiators, glazing and heat loss.
As a rough indication, however, the current Danesmoor range gives you three steps:
- 12/18: up to 18kW
- 18/25: up to 25kW
- 25/32: up to 32kW
The 18/25 sits in the middle of the range and is suitable for medium-sized properties and higher heating requirements.
However, bigger isn't automatically better.
An oversized boiler can be inefficient and may short-cycle, repeatedly switching on and off because its output exceeds the property's heating demand.
The correct output should therefore be determined through a proper assessment of the property and heating system, rather than simply choosing the largest available box.
Can The Greenstar Danesmoor Work With Solar?
Yes.
Worcester Bosch lists the current Danesmoor System Utility range as solar compatible.
That's potentially useful for homeowners who want to combine different technologies rather than rely entirely on a single energy source.
Exactly how much benefit you'll receive depends on the wider heating and hot-water system, so this is something worth discussing when your installation is designed.
What About HVO?
There's another interesting detail hidden in Worcester Bosch's professional documentation.
Worcester Bosch lists HVO conversion kits for several current Greenstar Danesmoor System Utility and External System models.
Hydrotreated vegetable oil, or HVO, has attracted interest as a possible lower-carbon alternative to conventional heating oil.
However, we'd be cautious about treating this as a guarantee that buying a Danesmoor makes your heating system future-proof.
Fuel availability, cost and future government policy all remain important considerations.
Think of HVO compatibility as an interesting additional capability rather than a crystal ball.
Greenstar Danesmoor Guarantee
Worcester Bosch advertises up to a seven-year guarantee on the Greenstar Danesmoor System Utility when installed by a Worcester Accredited Installer, subject to its terms and conditions.
As always, check the exact boiler guarantee conditions attached to your installation rather than assuming every Danesmoor automatically receives the maximum term.
Greenstar Danesmoor Pros And Cons
Sometimes it’s best to draw up a list of pros and cons to determine whether or not a heating solution is suitable for your home.
| Pros | Cons |
|---|---|
| Designed specifically for off-grid homes | Still relies on a fossil fuel when running on conventional heating oil |
| A-rated condensing boiler | Oil prices can fluctuate |
| 18kW, 25kW and 32kW maximum output choices | Requires an oil storage tank |
| Internal and external installation options | System versions require a separate hot-water cylinder |
| External models save indoor space | Low-carbon heating policy continues to develop |
| Solar compatibility | A heat pump may be a better long-term option for suitable homes |
| HVO conversion kits available for certain models | HVO availability and price remain considerations |
| Up to seven-year guarantee available subject to conditions | Correct sizing and installation require specialist assessment |
Should You Buy A Worcester Bosch Greenstar Danesmoor?
This is where the Danesmoor becomes more interesting than simply asking whether it's a "good boiler".
Technically, there's plenty to like.
It's a modern condensing oil boiler from an established UK heating manufacturer, comes in several useful outputs, and offers the choice of internal or external installation.
But whether you should replace an existing oil boiler with another oil boiler requires a bigger conversation in 2026.
An Engineer's View
The Danesmoor remains a highly reliable workhorse for off-grid properties, especially when space is at a premium and an external model is required. However, it is vital to thoroughly assess your property's insulation and long-term heating strategy, as transitioning to a heat pump could offer better efficiency and government support.
- Matthew Powell, Gas Safe Engineer
If your property isn't connected to mains gas, already has an oil tank and heating system, and moving to another technology would involve significant additional work, then a Danesmoor can be a relatively straightforward replacement option.
On the other hand, government policy is clearly encouraging low-carbon heating.
The Boiler Upgrade Scheme now provides enhanced support for eligible off-gas-grid properties replacing oil heating with an air-to-water heat pump, so it's worth comparing both routes before committing to another oil boiler.
That's especially true because a new boiler should hopefully last you many years.
The question isn't simply:
"Can I still install an oil boiler?"
At the moment, the answer to that is yes.
The more useful question is:
"What heating system makes the most sense for this particular property over the years ahead?"
Find The Exact Danesmoor Model For Your Home
For some off-grid homes, the Worcester Bosch Greenstar Danesmoor may still provide a very practical answer.
If you're considering replacing your current boiler, the easiest place to start is with WarmZilla's online boiler survey.
Answer a few questions about your home, heating system and hot-water requirements, and we'll help narrow down the most suitable options for your property.
Frequently Asked Questions
Is The Worcester Bosch Greenstar Danesmoor Still Available In The UK?
Yes. Worcester Bosch continues to list current Danesmoor models, while WarmZilla stocks several Utility and External versions. Worcester Bosch also continues to publish current product specifications and installation literature.
How Efficient Is The Worcester Bosch Greenstar Danesmoor?
The current Greenstar Danesmoor range has an A ErP rating for space heating. WarmZilla currently lists the 18/25 Utility System model at around 90% efficiency.
Which Greenstar Danesmoor Size Do I Need?
The range offers maximum heating outputs of 18kW, 25kW and 32kW. The correct size depends on factors such as property size, insulation, heat loss, and radiator requirements, so it should be professionally assessed rather than chosen based on bedroom count alone.
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