Cabinet Height


Cabinet Width


Cabinet Depth


High SEDBUK efficiency rating and easy to install.

The Keston System S30 boiler provides a simple and reliable solution for a wide variety of sealed domestic systems in both 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 S30 can be conveniently fitted out of sight into a standard kitchen cupboard†.

Complete with a 7 year warranty***, the Keston System boiler provides simple heating control, all from a single compact appliance.

†Please check cupboard size prior to installation

  • Easy to see pressure gauge

  • Large backlit display with user friendly controls

  • Low lift weight

  • Low component count maximising reliability

  • High efficiency

  • Compact dimensions

  • Twin flue up to 27m*

  • 50mm muPVC solvent weld flue allowing simple, cost effective installations**

  • Weather compensator supplied as standard

  • Inbuilt frost protection

  • Fully modulating

  • Digital display with simple diagnostics

  • 7 year warranty***

* For the maximum total equivalent flue length please refer to the installation instructions.

** The only systems approved for this application are: Marley muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe System 2000 muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe Terrain Solvent Weld System (50mm) and Wavin Osma PVC-C Solvent Weld System (50mm). Please use the recommended Solvent Weld Cement for each system.

*** 7 year warranty when installed with a Keston filter and registered within 30 days of installation. 5 year parts & labour warranty as standard. 7 year warranty available until 31/12/18. Terms and conditions apply.

System 30 Technial Specification