Let’s talk about one of our most popular boilers, the Greenstar 4000. Available in combi (25kW – 30kW) and system (12kW – 24kW) variants, this boiler packs a punch and makes installation a dream. With outputs at 1.0 – 1.2 bar for combi maximum flow rate, it's a super quiet powerhouse. 

Built on the tried, tested, and much-loved features of the Greenstar i, the Greenstar 4000 is instantly familiar and yet totally transformed in appearance, performance, and installer plus points. We kept everything we know you love and then raised the bar with the ease of installation, commissioning, and servicing. 

Key features:

• Guaranteed - Up to 10 years peace of mind* 

• Top Performance - Wide modulation range and range rateable to reduce gas consumption 

• Simple Switch - With Greenstar i, i Junior, and Si 

• Flexible - Pre-piping jig and rear piping as standard 

• Innovative Design - Intuitive full-text colour display and RF control compatibility 

• Easy servicing - Front access to all key components including PR

*Terms and conditions apply, training required for maximum guarantee length.