Keston Gas Boilers

Greenheat supply and fit all models of Keston Boilers. Below is a guide for the most popular models from the current range and suitable applications.

Please note boiler types and sizes are only suggestions. We would suggest these are all checked for the output needed for your property.

Water storage means that you have a method of storing water in your home ie. a hot water cylinder or an unvented hot water cylinder.

Keston Combi 30 – (30 & 35 kW)

Offering first-class comfort in a compact, wall-hung appliance small enough to fit inside a standard kitchen cupboard†, the Keston Combi 30 & 35 enable heating and hot water to be controlled independently, ensuring maximum comfort and efficiency.

The Keston Combi & 35 can be sited almost anywhere in the home, without the need for a separate tank. And because they connect to the unique Keston twin-flue system, the boiler can be situated anywhere up to 27* metres from the flue outlet, helping to provide further flexibility when required.

Fully modulating, and with weather compensation, the Combi 30 & 35 provide excellent energy savings, making it the perfect choice for new or replacement installations alike.


Keston System 30

The Keston System range of boilers provides a simple and reliable solution for a wide variety of sealed domestic systems. Available in 30kW, the Keston System provides a dependable and efficient solution for new and replacement installations.

Time saving push & clip flue spigot connections and a wide range of alternative flueing solutions help to ensure the product is installed quickly in virtually any domestic situation. With a lightweight design, concealed connections at the base and no compartment ventilation required, the Keston System can be conveniently fitted out of sight into a standard kitchen cupboard.

Complete with a 2 year parts and labour warranty, the Keston System boiler provides simple heating control, all from a single compact appliance.

heat-largeKeston Heat 45Kw

The Heat range offers a number of key features that enables ease of installation, maintenance and operation the Heat range is designed to ensure all installation requirements can be achieved.

The lightweight design is supported through quality build and aesthetics that allow for the boiler to be installed either on the wall or into a prefabricated floor mounted frame including back-to-back options.

Supported by a 2 year parts and labour warranty, the Heat is a reliable and efficient wall hung solution. The quality of this product range has been developed through meticulous design, careful component selection and proving; leading to reliability and longevity.

The range provides high efficiencies for low running costs with up to 110% part load and seasonal efficiency (ref Building Regs Part L2) up to 97%. The range also provides low NOx emissions at Class 5 and at less than 40mg/kWh achieve maximum points under BREEAM schemes.

Keston Heat 55kW

The 55kw in the Heat range has the same specifications as the Heat 45 above with uprated output.

frame_headerFrame & Header Kits

Compact yet powerful, the Keston C90 delivers up to a 90kW output in a unit only 337mm deep and 1,000mm long. Combining high-efficiency single pass stainless steel heat exchangers with ultra-low emission burners, the C90 provides a complete no nonsense single unit solution ideal for commercial settings. Made from the highest quality stainless steel, the heat exchangers are corrugated to provide a massive surface area within a compact space, whilst maximising efficiency and preventing corrosion. Complete peace of mind and total performance can be achieved thanks to this powerful, compact and efficient solution, making the unit an ideal choice for new-build and replacement installations alike.

Keston range of Combi, system and heat boilers are built in the UK and come with flue positioning capabilities of to up 27 metres which means Keston boilers can be sited almost anywhere in the home.

With Keston , your boiler can be situated any room, any place, anywhere – no compromise.