Choosing the right boiler for your home is no small task. With so many heating options on the market, finding one that meets your heating and hot water needs while remaining efficient and affordable can feel overwhelming.
Introducing the Worcester Bosch Greenstar 30Si Compact Combi Gas Boiler, a top-rated, space-saving solution ideal for small to medium-sized homes, delivering reliable heating and hot water efficiency.
If you need to upgrade or replace your existing boiler, this Worcester model might just be the ideal fit. This blog will help you make an informed decision, covering everything from specifications, benefits, pricing, installation, and potential savings.
- Content Guide
- » What Makes the Worcester Bosch Greenstar 30Si Compact Stand Out?
- » Who Is the Worcester Bosch Greenstar 30Si Compact Designed For?
- » Pricing Overview of Worcester Bosch Greenstar 30si – Total Cost Breakdown
- » Key Benefits of the Worcester Bosch Greenstar 30Si Compact
- » Installation Guidance: Worcester Bosch Greenstar 30si Compact
- » Why Choose Worcester Bosch?
- » Invest in the Worcester Bosch Greenstar 30Si Compact Today.
- » Professional Boiler Installation Service
- » Frequently Asked Questions (FAQs)
What Makes the Worcester Bosch Greenstar 30Si Compact Stand Out?

The Worcester Bosch Greenstar 30Si Compact is a wall-mounted condensing combi boiler that delivers high efficiency (94%) and excellent reliability. Designed to provide both central heating and hot water in a single unit, it's perfect for homes with limited space.
Here's a quick look at the key features:
| Specification | Details |
|---|---|
| Efficiency Rating | 94% (A-rated for heat and water) |
| Hot Water Output | 30 kW |
| Central Heating Max. Output | 24 kW |
| Dimensions (H x W x D) | 690mm x 390mm x 280mm |
| ERP Rating | A (HEAT) / A (WATER) |
| Warranty | Up to 10 years available |
| Fuel Compatibility | Suitable for mains gas and LPG |
Make sure to call a professional for your boiler installation.
Who Is the Worcester Bosch Greenstar 30Si Compact Designed For?
This boiler is designed for households with lower to medium heating and hot water demands, making it ideal for:
- Small houses or apartments (1-3 bedrooms, 1 bathroom)
- Properties with limited space—fit it straight into a standard kitchen cupboard
- Homeowners or landlords seeking reliability, efficiency, and affordability
- Those looking for easy installation and low maintenance
Pricing Overview of Worcester Bosch Greenstar 30Si – Total Cost Breakdown
Here's a breakdown of the typical cost of the Worcester Bosch Greenstar 30Si Compact, including installation:
- Boiler Unit Price (including VAT): £1,160
- Installation Costs (including VAT): £500 - £1,000 Average
(Installation costs depend on the complexity of the job and your property layout.) - Sundries (e.g., filters, flue, controls): ~£300 Average
Total cost around (inc. VAT): £2,000 - £2,500
It's worth noting that finance options are available at many installation providers to spread the cost.
Key Benefits of the Worcester Bosch Greenstar 30Si Compact
1. Energy Efficiency
Thanks to its 94% efficiency rating, this boiler reduces your energy consumption and keeps your utility bills low. Its A-rated performance ensures consistent heating and hot water while being eco-friendly.
2. Compact and Space-SavingAt just 69cm tall and 28cm deep, it's one of the most compact boilers on the market. Perfect for fitting into tight spaces like kitchen cupboards without compromising on performance.
3. Instant Hot WaterThe 30Si guarantees hot water on demand with virtually no waiting time. It delivers a consistent flow rate of 10.7 litres per minute, which is essential for smaller households with one bathroom.
4. Ease of UseBuilt for simplicity, the boiler comes with two rotary dials for setting heating and hot water temperatures, an analogue pressure gauge, and an LCD display. Features like the blue light indicator provide instant status feedback, ensuring you're always in full control.
5. Smart Thermostat CompatibilityEnhance your heating system by pairing the 30Si with a smart thermostat like Hive or Nest. With a smartphone app, you can control your heating from anywhere, making it simple to boost efficiency and enhance convenience.
6. Reliability and GuaranteeWorcester Bosch is renowned for its product reliability. With a 5-year standard guarantee, extendable to 10 years, you can trust your boiler to keep running smoothly for years.
7. LPG CompatibilityFor homes without access to mains gas, an LPG-compatible version is available, offering the same great features and performance.
8. Frost ProtectionFrost protection allows safe installation in colder spaces, such as garages or lofts, without worrying about winter's impact.
Installation Guidance: Worcester Bosch Greenstar 30Si Compact
Getting a new boiler installed can feel like a big job, but the Worcester Bosch Greenstar 30Si Compact is designed with ease of installation in mind.
Here's what the process typically involves:
AssessmentAn experienced heating engineer will assess your property to confirm that the 30Si Compact is the best fit for your home's heating requirements.
Installation DayExpect a straightforward installation process, owing to the boiler's compact design and wall-mounted configuration. Installation can take between 4-8 hours, depending on the complexity.
Testing and DemonstrationPost-installation, the engineer will test your new boiler and show you how to operate it, including setting the controls and adjusting temperatures.
To avoid costly issues in the future, ensure a gas heating engineer carries out your installation.
Why Choose Worcester Bosch?
Worcester Bosch is renowned for its exceptional quality and reliability, earning high praise in independent Which? Best Buy surveys. Their long-standing reputation is backed by a Royal Warrant, affirming their position as the boiler of choice for the UK's royal household.
Each Worcester Bosch boiler is also designed and manufactured in the UK, ensuring top-build quality and consistent performance. The combination of heritage, innovation, and customer trust makes Worcester Bosch a top choice for homeowners and landlords alike.
Invest in the Worcester Bosch Greenstar 30Si Compact Today.
The Worcester Bosch Greenstar 30Si Compact is a smart, reliable, and energy-efficient choice for small to medium homes. Whether you're a homeowner, landlord, or heating engineer, this compact combi boiler delivers the ideal mix of performance, reliability, and cost-effectiveness.
Check out our blog on "Common Mistakes to Avoid During Boiler Installation" for helpful tips and advice.
Professional Boiler Installation Service
Whether you're upgrading your heating system or installing a new boiler, we make the process seamless and hassle-free.
Get an instant price estimate online in just 20 seconds and take the first step toward a warmer, more energy-efficient home.
Your new boiler installation is just a click away!
Visit our boiler reviews blog section to learn more and gain valuable insights about different boilers.
FAQs
Can the Worcester Bosch Greenstar 30Si Compact handle heavy water usage?This boiler is perfect for small to medium-sized London homes with one bathroom. For larger properties or homes with multiple bathrooms, consider a higher-capacity model like the Worcester Greenstar 38CDi for better performance.
What’s the warranty on the Worcester Bosch Greenstar 30Si Compact boiler?It comes with a standard 5-year guarantee. You can extend it to 10 years when installed by a Worcester Bosch accredited installer—ideal for London homeowners looking for long-term peace of mind.
Does the Worcester Bosch Greenstar 30Si support smart heating controls?Yes! The 30Si Compact works well with smart thermostats like Hive or Nest. You can control your heating remotely—perfect for busy London lifestyles or when you're commuting home.
How energy-efficient is the Worcester Bosch Greenstar 30Si Compact?It boasts a 94% efficiency rating, making it A-rated for energy performance. This means lower energy bills and reduced carbon footprint—great news for eco-conscious Londoners.




