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Last updated: 26th October, 2022


Worcester Bosch Greenstar CDi Compact Combi Review

Worcester Bosch Greenstar CDi Compact Combi Review

One of the most popular compact combi boilers on the market, here we take an in depth look at the main talking points and key features of the Worcester Bosch Greenstar CDi compact.

Worcester Bosch Boilers

As one of the world's leading names in heating innovation, Worcester Bosch, founded in 1962, is synonymous with customer satisfaction.

Blending high end technology with assured traditional engineering, has made the brand one of Europe's most trusted boiler manufacturers.

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Worcester Bosch Greenstar CDi Compact

At iHeat, we stock a wide range of Worcester boilers. However, today we're going to be talking about the popular Greenstar CDi compact model. One of the best compact boilers on the market.

The Worcester Bosch Greenstar CDi Compact has been created to follow the form of the extremely popular original Greenstar branch of the Worcester Bosch range.

Combining the latest in heating design and energy efficient application, the Greenstar hallmark represents a modern icon of the boiler industry.

The versatile Greenstar CDi compact comes in three available kW outputs and flow rates:

kW (kilowatt) Output Size

Flow Rate - l/min (litres per minute)


11.4 l/min


13.1 l/min


14.7 l/min

Greenstar CDi Compact Spec

Efficiency rating


Energy efficiency class

A rated


Wall mounted




680mm (Height) x 390 (Width) x 280mm (Depth)

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Greenstar CDi Compact Review

Greenstar CDi Compact Key Features

Energy Efficiency

The Greenstar CDi compact has an A rated ErP score with a 93% efficiency rating. An energy efficient new boiler can significantly reduce an owner’s energy bills, with an A rated boiler considerably helping homeowners save money compared to an old boiler or antiquated system.

Built In Frost Protection

Cold weather complications account for a huge number of boiler unreliability or breakdown issues, this often results in service or repair fees.

The Greenstar CDi compact releases condensed flue gases via a CondenseSure siphon, in cyclical bursts to reduce blockages stemming from a frozen condensate pipe.

Compact Size

The smallest model in the CDi range, the sleek design of the compact means it can be easily wall mounted or fit into a standard kitchen cupboard.

The CDi compact is ideally suited to heat small properties but does have the power outage and flow rate in its 36kW capacity to sufficiently heat a medium sized home.

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Combi Boiler

Benefits Of Combi Boilers

Combi boilers are a popular choice for a number of reasons. Unlike conventional boilers, combi (combination) boilers link a home’s central heating system and water heating; no separate hot water tank is needed which is cleaner as it avoids potential rust or debris build up.

This allows a compact boiler which could fit into a standard kitchen cupboard or be wall mounted, to thoroughly heat a home without stealing lots of space.

Combi systems are also easier to service or for boiler replacement due to their popularity, meaning greater availability.

CDi Compact A Rated

Aluminium Heat Exchanger

The CDi compact comes as standard, as do all Worcester Bosch boilers, with an aluminium heat exchanger.

Although initially efficient, aluminium is far more susceptible to corrosion compared to stainless steel heat exchangers. Heat exchangers can become faulty over time, but this is a relatively simple fix.

Smart Thermostat

The Greenstar CDi compact is fully compatible with smart thermostats like the Worcester Bosch easy control system.

This means thanks to the brainy bunch who manufactured your new boiler, it can be easily controlled at the touch of a button for rapid regulation and optimisation.

Worcester Bosch Greenstar CDi Compact Price

The price of the Greenstar CDi compact varies on the output you require, the higher the kW output, the more the initial boiler unit cost.

iHeat offers prices ranging from £2190-£2690 on the CDi compact range, this includes free next day installation by a Gas Safe registered engineer.

Should You Buy A New Worcester Bosch Greenstar CDi Compact Boiler?

Overall the CDi compact is a great choice for a new central heating and hot water system.

A lightweight unit, that is both space saving and highly efficient, making it a perfect fusion of design and application for small or medium sized properties.

Providing a substantial heat output for this size boiler, the CDi compact combi definitely provides a healthy cost value from a trusted UK brand. 

Get an instant free quote and fixed price on the Greenstar CDi compact range today here at iHeat

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