Cabinet Height


Cabinet Width


Cabinet Depth


Complete hassle-free home comfort from a single compact appliance.

Offering first-class comfort in a compact, wall-hung appliance small enough to fit inside a standard kitchen cupboard†, the Keston Combi C35 enables heating and hot water to be controlled independently, ensuring maximum comfort and efficiency.

The Keston Combi C35 can be sited almost anywhere in the home, without the need for a separate tank. And because it connects to the unique Keston twin-flue system, the boiler can be situated anywhere up to 25* metres from the flue outlet, helping to provide further flexibility when required.

Fully modulating, and with weather compensation, the Combi C35 provides excellent energy savings, making it the perfect choice for new or replacement installations alike.

†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
  • Compact dimensions
  • Twin flue up to 25m*
  • 50mm muPVC solvent weld flue allowing simple, cost effective installations**
  • Weather compensator supplied as standard
  • Pre-fitted filling loop
  • Inbuilt frost protection
  • Fully modulating
  • On board diagnostics
  • Automatic bypass
  • 2 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.

Combi 35 Technical Specification