WORCESTER BOSCH GREENSTAR 4000 BOILER RANGE BY SMARTGAS
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Worcester Bosch Greenstar 4000 Boilers in Edinburgh
Looking for a reliable, energy-efficient boiler that’s perfectly suited to Edinburgh homes? The Worcester Bosch Greenstar 4000 range combines German engineering excellence with practical features designed for Scottish properties.
This is one of our best selling boilers and below you’ll find out all the detailed information on the different styles it comes in.
Whether you’re in a Morningside tenement, a Leith flat, or a family home in Corstorphine, this modern condensing boiler delivers consistent heating and hot water whilst keeping your energy bills in check. For further info on our Worcester Boilers ranges check our main page.
Smart Gas Solutions is your local Worcester Bosch Accredited Installer, bringing over 25 years of experience fitting these premium boilers across Edinburgh and the Lothians. We’ll handle everything from your initial home survey through to warranty registration.
Why Smart Gas Recommends the Greenstar 4000 Range
The Greenstar 4000 isn’t just another boiler — it’s Worcester Bosch’s answer to modern heating demands. Here’s why Edinburgh homeowners are choosing it:
Built for Scottish Homes
With outputs ranging from 12kW to 30kW, there’s a perfect match for every property size. The compact 724mm × 400mm × 310mm dimensions fit neatly between standard kitchen cupboards — crucial for Edinburgh’s space-conscious properties. [WB Manual, p.8]
Whisper-Quiet Operation
Awarded the Quiet Mark certification, the Greenstar 4000 operates below 45dB (system boiler even as low as 42dB) — quieter than normal conversation, library or quiet office. Your neighbours in adjoining flats won’t even know it’s running. [WB Product Data]
Weather Compensation Ready
Edinburgh’s unpredictable weather demands intelligent heating. The Greenstar 4000’s built-in weather compensation adjusts your heating automatically, potentially saving 10-12% on annual gas bills compared to standard controls. [Energy Saving Trust, 2024]
Proven Reliability
Worcester Bosch has been manufacturing boilers for over 50 years. The Greenstar 4000 builds on this heritage with robust aluminium-silicon heat exchangers and intelligent diagnostics that prevent common faults before they occur.
Boiler Types in the Range
Combi Boilers (Most Popular for Edinburgh Flats)
System Boilers (Ideal for Larger Homes)
Key Features & Efficiency Technical Specifications
| Model | Type | Output (kW) | DHW Flow (l/min @35°C) | Fuel | Dimensions (H×W×D) | Typical Use |
|---|---|---|---|---|---|---|
| Greenstar 4000 25 | Combi | 25 (CH range-rated up to ~24) | 10.2 | Natural Gas / LPG | 724 × 400 × 310 mm | Flats & small homes, 1 bathroom |
| Greenstar 4000 30 | Combi | 30 (CH range-rated up to ~24) | 12.3 | Natural Gas / LPG | 724 × 400 × 310 mm | Small–mid homes, 1 bathroom |
| Greenstar 4000 12 | System | 12 | — (uses cylinder) | Natural Gas / LPG | 724 × 400 × 310 mm | Small properties with hot water cylinder |
| Greenstar 4000 15 | System | 15 | — (uses cylinder) | Natural Gas / LPG | 724 × 400 × 310 mm | Small–mid properties with cylinder |
| Greenstar 4000 18 | System | 18 | — (uses cylinder) | Natural Gas / LPG | 724 × 400 × 310 mm | Mid properties, multiple rads, cylinder |
| Greenstar 4000 21 | System | 21 | — (uses cylinder) | Natural Gas / LPG | 724 × 400 × 310 mm | Larger systems, cylinder |
| Greenstar 4000 24 | System | 24 | — (uses cylinder) | Natural Gas / LPG | 724 × 400 × 310 mm | Larger homes, higher CH load, cylinder |
Note: Greenstar 4000 combis: 25 & 30 kW (10.2 / 12.3 l/min @35°C). System: 12/15/18/21/24 kW. Typical dimensions across the range are 724 × 400 × 310 mm.
Technical data verified: Worcester Bosch Installation Manual (6 720 891 161). View/download manual. Last checked: .
Energy-Saving Technology
Intelligent Modulation
Can cut gas use substantially versus old G-rated boilers (A-rated = 90%+ vs G-rated <70%), with typical EST bill savings in the £300 to £500/yr range, property-dependent.[Worcester Bosch News]
Condensing Excellence
Installation & Local Expertise
Our Installation Process
Day 1: Survey & Quote
Our Gas Safe engineer visits your property to assess:
– Current system configuration
– Flue routing options (particularly important in tenements)
– Condensate disposal routes
– Existing pipework condition
– Control upgrade opportunities
Day 2: Installation Day
– 8am arrival with all materials
– System drain-down and old boiler removal
– New Greenstar 4000 positioning and mounting
– Pipework modifications to current standards
– Flue installation (compliant with Scottish Building Standards)
– System filling, commissioning, and testing
– Full handover and control demonstration
– Typically complete by 4pm for straightforward swaps
Post-Installation
– Warranty registration with Worcester Bosch
– Building Standards compliance certificate issued
– Gas Safe notification submitted
– 12-month installation guarantee from Smart Gas
Edinburgh-Specific Considerations
Tenement Flue Regulations
Edinburgh’s tenement buildings require careful flue positioning. We ensure minimum 300mm clearances from openable windows and 600mm from boundaries — crucial for shared walls. [Scottish Building Standards, Section 3]
Condensate Freeze Protection
With Edinburgh winter temperatures dropping below -10°C, we install all condensate pipes with proper insulation and correct fall angles. Internal routing preferred where possible. [BS 6798:2014]
Listed Building Compliance
Working in New Town or Old Town? We coordinate with Edinburgh Council for any external flue terminals on listed properties, ensuring heritage compliance without compromising efficiency.
Real Customer Experience
“We’ve recently had a new boiler (Worcester Bosch 4000) installed by Smartgas Solutions. The entire process from start to finish was very professional and on a high standard. The communication with the company has been always effortless – they respond in a timely manner. Although there had been a small unpredicted issue following the installation, the company was quick to resolve it! Arron and William left the flat clean and tidy. The boiler functions were explained to us prior to them leaving. 5* service – very professional and knowledgeable. If you are looking to change your boiler, I’d most certainly recommend Smartgas Solutions to do this!”
Ewelina S., Edinburgh ⭐⭐⭐⭐⭐
Smart Controls & Quiet Operation
The Greenstar 4000 excels with intelligent controls:
Worcester Bosch EasyControl
– Designed specifically for Greenstar boilers
– Weather compensation included
– App control from anywhere
– Typical saving: 10-12% on heating bills
Third-Party Options
– Nest Learning Thermostat: Compatible via volt free/low-current connections
– Hive Active Heating: On/off control (no modulation)
– Tado Smart Thermostat: via standard 230v room thermostat wiring
NOTE: using the manufacturers EasyControl setup will always get the most from your boiler.
Quiet Mark Certification
Laboratory-tested at under 45dB(A), the Greenstar 4000 earned the prestigious Quiet Mark award. For context:
– Normal conversation: 60dB
– Greenstar 4000: <45dB
– Whisper: 30dB
This matters in Edinburgh’s stone-built properties where sound travels. Your boiler won’t disturb work-from-home calls or wake light sleepers.
Warranty & Maintenance
Standard Warranty: Up to 7 years manufacturer’s guarantee
Extended Warranty:
– 8 years with Greenstar system filter
– 10 years with Greenstar system filter + Worcester Bosch Accredited Installer (WAI)
Warranty Conditions:
– Installation by Worcester Bosch Accredited Installer (Smart Gas qualified ✅ )
– Annual service by Gas Safe engineer
– Genuine Worcester Bosch parts only
– System inhibitor maintained to BS 7593 standards
Annual Servicing:
Your Greenstar 4000 requires yearly maintenance to maintain efficiency and warranty:
– Combustion analysis and adjustment
– Heat exchanger inspection
– Condensate trap cleaning
– Safety device testing
– System inhibitor check
– Service record completion
Smart Gas Solutions offers fixed-price annual servicing with automatic reminders.
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GREENSTAR 4000 BOILER FAQs
What is the lifespan of a Greenstar 4000 boiler?
Around 10 – 15 years on average. With a correct install, clean system water, and annual servicing, many Greenstar 4000 boilers run efficiently for longer. Replacing filters, checking inhibitor levels, and keeping flow temps sensible all help extend life.
Is the Worcester Bosch Greenstar 4000 a good boiler?
Yes—the Greenstar 4000 is widely regarded as a strong choice. It’s efficient and reliable, runs quietly, and its compact, modern design suits most homes. Compared with older models, it adds smarter controls and energy-saving modulation, making it an excellent all-round upgrade.
How many radiators can a Worcester 4000 run?
Roughly up to 15 average-sized radiators on the 30 kW Greenstar 4000, assuming a typical Edinburgh home and standard outputs per rad. The 25 kW version is usually comfortable up to 10 radiators. Exact numbers depend on heat loss, radiator sizes, and flow temperature.
What's the difference between 25kW and 30kW models?
The 30kW provides faster hot water delivery — filling a bath in approximately 8 minutes versus 10 minutes with the 25kW. The 25kW provides up to 24kW for central heating, while the 30kW also provides up to 24kW for central heating (both models modulate down to 3.0kW minimum). So the main difference is the supply of the hot water, bigger machine = faster output of hot water ✅ . They both provide the same output for the heating system.
Testimonials
What Our Clients Say
FIVE Star Service
We’re not happy until you’re happy. At SmartGas, we intend to keep our 5-star reputation.
Professional Engineers
We pride ourselves on our fully qualified engineers. We never sub-contract our work.
Licence & Insured
As you’d expect, we don’t cut corners and make sure all our customers are protected.
Benefits of Choosing SmartGas for Worcester Bosch Boilers
We look forward to being of service; here’s what you can expect.
Worcester Bosch Accredited Installers
SmartGas is accredited by Worcester Bosch, meaning we meet the highest standards in boiler installation and service quality.
Local Expertise
Based in Edinburgh, we know the local area and understand the specific heating needs of homes in Scotland.
Highly Skilled Engineers
All our engineers are Gas Safe Registered and undergo regular training to stay updated on the latest Worcester Bosch technologies and systems.
Customer-Focused Service
We pride ourselves on our friendly, professional approach, ensuring complete satisfaction for every customer.
Trusted Local Company
With years of service in Edinburgh, we’ve built a reputation as a trusted local heating company backed by Edinburgh Trusted Trader and Which Trusted Trader. Our focus is always on delivering quality workmanship and excellent customer service.
Which Trusted Traders
Trusted Traders is an endorsement scheme for trade services that recognises reputable traders who successfully pass an assessment process carried out by our trading standards professionals.
Edinburgh Trusted Trader
Smart Gas Solutions is proud to be an Edinburgh Trusted Trader. This is the official “go-to” list of Trading Standards Trusted Traders, backed by The City of Edinburgh Council and supported by Police Scotland.
GAS SAFE™
Smart Gas Heating & Plumbing are Gas Safe registered. Gas Safe Register is the official register for engineers who are legally permitted to carry out gas work.
SNIPEF™
Using a SNIPEF Licensed Plumber gives you peace of mind that you are choosing a plumbing business which uses properly trained and qualified operatives.
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