Key Information
- 35kW Output — Ideal for homes with higher hot water demand
- Gas Combi Boiler — Provides heating and instant hot water from one compact unit
- Compact Cupboard-Fit Design — Small footprint for flexible installation
- Top and Rear Flue Options — Allows greater siting flexibility
- Aluminium Heat Exchanger — Lightweight, durable and efficient
- Patented Four-Sided Cooling System — Reduces stress on internal components
- Grundfos High-Efficiency Pump — Helps reduce energy consumption
- Warm Start Function — Provides quicker hot water delivery
- Two-Stage Frost Protection — Helps maintain reliable operation in colder conditions
- 2-Year Manufacturer Guarantee — Peace of mind from Vaillant
What's Included
The Vaillant ecoFIT Sustain 835 35kW Gas Combi Boiler offers powerful heating and reliable hot water performance in a compact, cupboard-fit design. As part of the ecoFIT Sustain range, it delivers an excellent size-to-output ratio, providing strong performance while maintaining a small footprint that suits modern homes.
Designed for flexible installation and efficient operation, the ecoFIT Sustain 835 combines Vaillant’s trusted engineering with high-quality components to deliver dependable heating and hot water throughout the home.
High Output Heating and Hot Water
With a 35kW output, the ecoFIT Sustain 835 is ideal for homes with higher hot water demand, such as properties with multiple bathrooms. Despite its powerful performance, the boiler maintains a compact cupboard-fit design, allowing it to be installed neatly inside standard kitchen cupboards.
A high-quality aluminium heat exchanger provides efficient heat transfer while remaining lightweight and durable, helping ensure long-term reliability and easier maintenance.
The boiler also delivers up to 89.3% efficiency (SAP 2010), helping households reduce energy consumption and running costs.
Flexible Installation Options
The ecoFIT Sustain 835 is designed to provide maximum installation flexibility. Top and rear flue options allow the boiler to be positioned in a variety of locations within the home.
It is also compatible with Vaillant’s full range of flue systems and intelligent controls, making it easy to create a heating system tailored to the property’s needs.
A patented condensate trap simplifies installation of these gas boilers while offering an additional safety backup for reliable operation.
Energy Efficient Operation
The ecoFIT Sustain 835 incorporates several advanced components to improve efficiency and system performance. A fully modulating low NOx burner and fan help optimise combustion and reduce emissions.
The boiler also features a high-efficiency Grundfos pump, which automatically adjusts its performance to match system demand while using less energy.
With a 1:4 modulation range, the boiler can vary its output according to heating demand, helping maintain efficient operation throughout the year.
Built for Long-Term Reliability
Vaillant has designed the ecoFIT Sustain range with durability in mind. The patented four-sided cooling system helps reduce stress on internal components, which can lower maintenance costs over time.
A clear Vaillant diagnostic display allows engineers to quickly access system information during installation or servicing.
The boiler also includes two-stage frost protection, helping maintain reliable operation during colder weather conditions.
Order from PlumbNation Today
Choose the Vaillant ecoFIT Sustain 835 35kW Gas Combi Boiler for powerful heating, efficient performance and reliable hot water delivery. Order today from PlumbNation for competitive pricing, expert advice and fast UK delivery.
