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Worcester Bosch Greenstar 4000 21kW System Boiler NG

Original price was: £2,603.00.Current price is: £2,585.00.

🔥 Recommended | ✅ Free delivery | ✅ Includes Installation

 

🏡 Perfect For:

✅ 3-4 bedroom homes 🏠
✅ Homes with 2 bathrooms 🚿🚿
✅ Growing families 👨👩👧👦
✅ Properties needing reliable stored hot water

Guaranteed Safe Checkout

Worcester Bosch Greenstar 4000 21kW System Boiler

Model 7733600383 – Powerful & Efficient Heating for Family Homes

The Worcester Bosch Greenstar 4000 24kW System Boiler is an excellent choice for small to medium-sized homes with moderate hot water demands. Its energy efficiency, compact design, and compatibility with renewable energy systems make it a future-proof investment.

🔥 Why This Boiler Shines:

✨ Feature 🌟 Benefit 🎯 Icon
💪 21kW Power Strong performance for family homes 🔥
💰 94% Efficient A-rated energy savings 💷
🛁 System Design Works with your hot water cylinder
🔇 Ultra-Quiet QuietMark certified (43dB) 🤫
🛡️ 10-Yr Guarantee Worcester’s trusted protection

🌡️ Heating Performance:

• Quick heat-up for medium-large homes
• Plenty of hot water for family use
• Compact design (780mm H)

💡Comparison with Other Boilers

Feature 🔥Worcester Bosch Greenstar 4000 21kW 🔥Ideal Logic System S18 🔥Vaillant ecoTEC Plus 620
🔥Output 21 kW 18 kW 20 kW
💷Efficiency 94% ErP 93% ErP 94% ErP
🛡️Warranty 10 years 7 years 10 years
🤫Noise Level Quiet Quiet Quiet

Solar Compatibility

Yes No Yes

👨🔧 Heating Expert Says:

“The sweet spot for family homes – delivers Worcester’s renowned reliability with just the right power for 3-4 bedroom properties.”

🌟Customer Says:

“Perfect for our 4-bed semi – never run out of hot water!” ⭐⭐⭐⭐⭐

  • The O’Connor Family, Manchester

🔧 Professional Installation:

✔ Installed by accredited engineers 👷
✔ Full system power flush 💦
✔ 2-year workmanship guarantee ✅

💎Why Choose This Model?

✔ Ideal power (21kW) for most UK family homes
✔ Works seamlessly with your existing cylinder
✔ Energy efficient operation
✔ 10-year warranty = peace of mind

💷 Great Value Offers:

🎁 FREE 11-year warranty (when installed by us)
🎁 Price match guarantee


Technical details

Greenstar 4000 21kW System

Part number: 7733600383

ErP Efficiency Rating

A

ErP Data SheetErP Data Sheet

Fuel TypeGas (NG)🔥

Control Options

EasyControl Compatible

Solar Compatible

Central heating output (kW)21🔥

Dimensions (mm) height x width x depth724* x 400 x 310

Clearances (mm) above, sides, below and front1134 x 410 x 910 (Including boiler dimensions)*

Maximum horizontal flue (mm)12000*

Maximum vertical flue (mm)60/100 = 12000, 80/125 = 21000

Ingress protection rating IPX4D

Wall mounting jig supplied

NOx emissions (mg/kWh)35

Lift weight (kg)33.2

Warranty terms apply. Price includes standard installation & parts by accredited engineers. 

Ready to Upgrade? Our experts can help:
📞Call 07932 84 2006
💬 Live chat on our website
📧 Email info@nationalboiler.co.uk


 

Weight 33.2 kg
Dimensions 310 × 400 × 724 cm
Bathroom

1-2 Bathrooms

Bedroom

2-3 Bedrooms, 4-5 Bedrooms

Fuel Type

GAS Boiler

Flue Type

Horizontal Flue, Vertical Flue

Boiler kW

21kW Boiler

ErP Efficiency Rating

A

Smart Control

Yes

Solar Pannel Compatible

Yes

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