🕑 8 minutes read
worcester-greenstar-18ri-review

When replacing a boiler, it's essential to find one that's reliable, efficient, and tailored to your home's needs. That's where Worcester Bosch comes in—known for their award-winning reputation (including the coveted Which? 'Best Buy' award), the Greenstar 18Ri is one of the company's most popular offerings.

But what makes the Worcester Greenstar 18Ri stand out? Is it the right boiler for your home? This review covers all the key features, costs, and benefits to help you make the best decision for your heating needs.

Why Consider the Worcester Bosch Greenstar 18Ri?

The Greenstar 18Ri is a regular boiler, meaning it works with a hot water cylinder and cold-water storage cistern, making it ideally suited for homes with existing traditional heating systems.

With a central heating output of 18kW, it's designed for small to medium-sized homes with relatively low heating demand, such as 3–4-bedroom properties with 6–8 radiators.

Key Features at a Glance:

a-new-worcester-greenstar-18ri-boiler
  • Efficiency Rating: 92% (A-rated on the ErP scale)
  • Warranty: Up to 8 years (when installed by a Worcester Accredited installer with a Greenstar Filter)
  • LPG Compatible: Yes, adaptable for properties off the gas grid
  • Compact Size: Fits comfortably in standard kitchen cupboards (Dimensions: 600 x 390 x 270mm)
  • Solar Compatibility: Future-proofed for integration with Worcester Greenskies solar panels
  • Frost Protection: Ideal for protecting installations in colder areas like garages or lofts

What Makes Worcester Greenstar18Ri Great?

Beyond its core technical specifications, the Greenstar 18Ri is renowned for being quick and easy to install, making it an excellent solution for direct replacements.

Stick with your current pipework, radiators, and cylinder, and you'll face minimal disruption – convenient for homeowners who'd like to avoid a complete system overhaul.

Serviceteam is an accredited Worcester Bosch Installer offering reliable boiler installation services in London.

logos

Efficiency and Environmental Impact

One of the standout features of the Worcester Greenstar 18Ri is its energy efficiency.

a-homeowner-is-checking-energy-graph-on-his-phone
With a 92% efficiency rating and an ErP A rating, this boiler helps reduce energy consumption, lowering your utility bills and carbon footprint.

For homeowners considering solar energy adoption in the future, the 18Ri's compatibility with solar panels ensures your heating system remains eco-friendly long term.

Is the Worcester Greenstar 18Ri Right for Your Home?

Choosing a boiler involves a delicate balance between meeting your heating needs and optimal efficiency. Understanding your home's specific requirements is critical in determining if the Worcester Bosch 18Ri is a good match:

Ideal for:

  • Small or medium-sized homes (3–4 bedrooms with 6–8 radiators).
  • Properties with an existing cylinder and cold-water tank.
  • Households with a low demand for hot water usage or small bathrooms.
  • Homeowners seeking a compact boiler for easy storage in a kitchen cupboard or utility room.

Not Ideal for:

  • Flats, apartments, or homes without storage space for a cold-water tank and cylinder.
  • Large homes with higher heating and hot water demands.
  • Properties relying on gravity-fed hot water systems, as the 18Ri must be fitted within a fully-pumped system.

If your property doesn't quite align with these requirements, Worcester also offers alternative models in the Greenstar Ri range, with outputs ranging from 9kW (smaller homes) to 24kW (larger homes).

Before installing a boiler, be sure to check out our blog on ‘Things to Consider Before Boiler Installation’ for helpful tips and insights.

Get an online boiler installation within 20 seconds!

  • Free Instant Quotes are Available
  • Vaillant Accredited Installer
  • Which? Trusted Trader
  • Up To 12 Years Manufacturer's Guarantee
Get a Quotation Now! logos

Installation Process

Installing the 18Ri is a straightforward process for heating engineers due to its compact and wall-mounted design. A like-for-like replacement can usually be completed within 3–4 hours. If you wish to replace your old regular boiler while keeping your existing components (like radiators and cylinders), this boiler offers an excellent, hassle-free solution.

It's worth noting that this model should only be installed with a fully pumped system—not a gravity-fed one—to ensure optimal performance and compatibility.

Warranty and Guarantee

warranty-logo-graphic-image

Worcester Bosch offers one of the best warranties on the market, giving you up to 8 years of peace of mind when this boiler is installed by a Worcester Accredited Installer and fitted with their Greenstar filter.

This comprehensive, no-quibble guarantee is hard to beat, ensuring your heating investment is well protected.

Solar Heating Compatible

For eco-conscious homeowners, the Greenstar 18Ri is ready for the future.

It's compatible with solar heating systems, like Worcester's Greenskies Solar Panels, enabling you to reduce reliance on fossil fuels and seamlessly transition to renewable energy without needing to replace your boiler.

Costs to Expect

The total cost for the Worcester Greenstar 18Ri falls between £1,698–£2,198, including installation.

Here's a breakdown of the typical costs:

  • Boiler Price (incl. VAT): £898
  • Installation Costs: £500–£1,000 (depending on the complexity of the work)
  • Sundries (Filter, Flue, etc.): £300

Note: Installation costs vary depending on whether a straightforward replacement or more extensive modifications to the heating system are needed.

Always request a personalised quote from a certified installer to get an accurate estimate.

Pros and Cons of Choosing Greenstar 18Ri Boiler?

Pros

1. High Efficiency
The Greenstar 18Ri boasts a seasonal efficiency rating of 92% and an ErP A-rating for heat. This level of performance helps you lower energy consumption while also reducing your energy bills.

2. Space-Saving Design
Its compact size easily fits into a standard kitchen cupboard or press, making it ideal for homes with limited space.

3. Solar Heating Compatibility
Future-proof your home with this boiler's compatibility with solar heating systems, allowing you to embrace renewable energy options down the line.

4. Quick Installation
With a typical installation time of about 4 hours, getting your new boiler up and running is hassle-free.

Cons

While the Worcester Bosch Greenstar 18Ri is an excellent choice for many, there are a few points to keep in mind:

  • Not Ideal for Smaller Properties
    As a regular boiler, it requires a separate hot water cylinder, which may not be practical for homes with limited space.
  • Challenges in Homes with High Ceilings
    For homes with high ceilings and minimal insulation, this boiler may not deliver optimal heating performance.

Is It Right for Your Home?

The-Victorian-type-houses-in-London

The Worcester Bosch Greenstar 18Ri is perfect for medium-sized homes seeking efficient and compact heating solutions. If you have the space for a hot water cylinder and want a boiler that supports future solar heating upgrades, this model is an excellent investment.

However, smaller homes or properties with unique heating challenges might benefit from exploring other options.

With its energy efficiency, user-friendly installation, and space-saving design, the Greenstar 18Ri is a boiler that delivers comfort and convenience, making it a reliable choice for many households.

Get a Boiler Installation Quote Online in Just 20 Seconds!


Get a Quotation Now!

What Customers Think

Worcester Bosch has a strong industry reputation for reliability and performance. Customers often praise their boilers for efficient heating, user-friendly controls, and durable construction.

Here's what some users have said:

"Fantastic boiler with great efficiency. It fits perfectly into our small utility cupboard, and the installation was seamless!"
Maria J., Homeowner

"We needed a like-for-like replacement, and the 18Ri was the perfect choice. We've already noticed lower energy bills."
Arthur P., Landlord


With high customer satisfaction scores and endorsements from trusted sources, it continues to be a top choice.

Find the Right Boiler for You

heating-engineer-is-installing-a-boiler

If you're not sure whether the Greenstar 18Ri is the perfect fit for your home, a qualified heating engineer can assess your property's requirements and recommend the best size and model.

Always consult with a professional to ensure your system is installed safely and optimally.

Start your search for an installer today—simply compare quotes from trusted professionals in your area. With finance options available, competitive installation prices, and plenty of ongoing support, it's never been easier to upgrade your home heating system.

Our Final Verdict

The Worcester Greenstar 18Ri is an excellent choice for homeowners looking for an efficient, compact, and reliable boiler. Its straightforward installation process and compatibility with existing systems make it ideal for hassle-free replacements.

With an impressive 92% efficiency, solar compatibility, and up to an 8-year warranty, you're investing in a durable and future-ready heating solution.

Whether you're replacing an old boiler or simply exploring options for better efficiency, the Worcester Greenstar 18Ri is definitely worth considering.

To ensure the long-term efficiency and reliability of your boiler, make sure to schedule an annual boiler service.

Get Your Best Deal From Serviceteam

Get free installation quotes from serviceteam's trusted engineers in under 30 seconds!
Compare quotes and discover the best option for your home.

Discover more about Worcester Bosch boilers and other brands in our ‘Boiler Reviews’ section.

Back to Home