Vaillant ecoFIT Pure 835 Combi Boiler – High Efficiency Heating Solution
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The Vaillant ecoFIT pure 835 35kW Combi Boiler is a high-performance heating solution designed to deliver reliable central heating and hot water on demand. Combining a powerful 35kW output with a compact, space-saving design, this combi boiler is particularly suited to medium to large-sized homes with higher hot water requirements. Its efficient operation, quiet performance and compatibility with Vaillant controls make it a practical choice for modern heating installations.
Applications & suitability
Medium to large homes
The 35kW output makes the boiler suitable for properties requiring dependable heating and higher levels of domestic hot water performance.
Space-conscious installations
Its compact design allows the boiler to fit inside most kitchen cupboards, making it a practical option where installation space is limited.
High hot water demand
With an approximate hot water flow rate of 14.5 litres per minute, it is designed to support homes with greater hot water requirements.
Combi heating system
Provides central heating and domestic hot water from a single appliance without requiring a separate hot water storage cylinder.
Key specifications
| Product details | |
| Brand | Vaillant |
| Range | ecoFIT pure |
| Model | 835 |
| Boiler type | Combi boiler |
| Output | 35kW |
| Hot water flow rate | Approx. 14.5 litres per minute |
| ErP rating | A rated |
| Heat exchanger | Aluminium |
| Operation | Quiet operation |
| Controls compatibility | Compatible with a range of Vaillant controls and smart thermostats |
| Product supply | Boiler only |
Installation & compatibility
The Vaillant ecoFIT pure 835 should be installed by a qualified Gas Safe registered engineer in accordance with applicable installation requirements. The boiler is compatible with a range of Vaillant heating controls and smart thermostats, allowing users to manage heating and hot water settings conveniently. Flue kits and controls are sold separately unless specifically included with the selected package.
Design & performance benefits
Powerful 35kW output
Provides strong heating performance and high levels of domestic hot water delivery for properties with greater demand.
Compact installation
The space-saving design is suitable for cupboard installations, helping maximise available living and storage space.
Efficient performance
The ErP A rating supports efficient heating and hot water operation, helping optimise energy use during everyday operation.
Quiet operation
Designed with noise reduction in mind and Quiet Mark approved for quieter operation in residential environments.
Maintenance & everyday use
The integrated user-friendly display provides convenient access to boiler settings, while compatible Vaillant controls and smart thermostats can provide additional heating management options. Annual servicing by a qualified professional is recommended to help maintain safe, reliable and efficient boiler operation and to support applicable manufacturer warranty requirements.
Ideal for
The Vaillant ecoFIT pure 835 35kW Combi Boiler is ideal for medium to large-sized homes, busy households and properties with higher hot water requirements. Its combination of powerful output, approximately 14.5 litres per minute hot water flow, compact cupboard-friendly design, A-rated efficiency and quiet operation makes it a practical choice for homeowners upgrading an existing heating system or installing a new combi boiler.
