Vaillant ecoFIT pure 835 Combi Gas Boiler

ecoFIT pure 835 Combi Gas Boiler
Total Cost
£1,992 - £2,492
Manufacturer Vaillant
Boiler Model ecoFIT pure 835 Combi Gas Boiler
Condensing boiler? Condensing
Energy Efficiency Rating 94%
Energy Band A Rated
LPG model/Conversion kit No
Manufacturer Warranty 10 Years
Heating Output 26.7 kW
Wall Mounted or Floor Standing Wall Mounted
DHW Flow Rate 14.1 l/min
Total Cost £1,992 - £2,492
ERP Rating A Heat A Water
Hot Water Max Output 35 kW

Overview of Vaillant ecoFIT pure 835 Combi Gas Boiler

The Vaillant ecoFIT pure 835 Combi Gas Boiler is a high-efficiency, compact combination boiler that delivers reliable heating and hot water performance for modern homes.

Designed with sustainability and energy efficiency in mind, the ecoFIT pure 835 is perfect for households looking to reduce their energy bills without compromising on comfort.

This model is part of Vaillant’s renowned ecoFIT range, featuring advanced German engineering, durable components, and easy installation. Whether you’re upgrading from an older boiler or installing a new system, the ecoFIT pure 835 offers the perfect balance of performance, energy-saving technology, and compact design.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

Vaillant ecoFIT pure 835 Combi Gas Boiler Key Features

1. Compact Design

The ecoFIT pure 835 is designed to fit in tight spaces, including kitchen cupboards. Its small footprint makes it ideal for properties with limited space or for homeowners looking to keep things discreet.

2. High Efficiency

With an ErP A-rating for both heating and hot water, this combi boiler ensures lower energy consumption, helping reduce your carbon footprint and utility bills.

3. Quiet Operation

Thanks to its high-quality build and low-noise components, the ecoFIT Pure 835 runs quietly, making it ideal for homes where peace and quiet are a priority.

4. Hot Water on Demand

This combi boiler provides instant hot water, eliminating the need for a separate cylinder or tank. Perfect for medium-sized households with 2–3 bedrooms and one bathroom.

5. Intelligent Controls Compatibility

It’s compatible with Vaillant’s vSMART™ app-controlled thermostat, allowing for remote control, scheduling, and energy monitoring via your smartphone or tablet.

Is Vaillant ecoFIT pure 835 Suitable for My Home?

The ecoFIT pure 835 is ideal for medium-sized homes, typically with 2–3 bedrooms and one bathroom.

It’s designed to deliver high hot water flow rates and responsive heating performance, even during peak demand. If your household doesn’t require multiple bathrooms or excessive hot water usage, this model is an excellent choice.

For larger homes with more than one bathroom, you may want to consider a higher-output model in the ecoFIT range.

Size

The Vaillant ecoFIT pure 835 is known for its compact and lightweight design. It measures approximately:

  • Height: 700mm
  • Width: 390mm
  • Depth: 295mm

This makes it perfect for installations inside kitchen cupboards or utility room wall mounts, giving you flexibility without compromising on performance.

Vaillant ecoFIT pure 835 Range of Models

The ecoFIT pure range comes in multiple output levels to cater to different household needs. Here’s a comparison table with links to our dedicated product pages:

ModelPrice
Vaillant ecoFIT pure 825 Combi Gas Boiler£1,707 – £2,207
Vaillant ecoFIT pure 830 Combi Gas Boiler£1,858 – £2,358

Vaillant ecoFIT pure 835 Combi Gas Boiler Warranty Period

The ecoFIT pure 835 typically comes with a standard 5-year warranty, which can often be extended to 7 or even 10 years when installed by a Vaillant Advance installer. This warranty covers parts and labour, giving you peace of mind and assurance of long-term reliability.

Make sure to register your boiler within 30 days of installation to activate the full warranty.

Vaillant ecoFIT pure 835 Combi Gas Boiler Installation and Maintenance

Professional installation is key to getting the best performance from your Vaillant ecoFIT pure 835. Our Gas Safe registered engineers ensure safe and efficient installation, with full system testing and setup included.

Maintenance is just as important—annual servicing keeps your boiler running efficiently and ensures your warranty remains valid. We offer flexible maintenance packages and annual servicing to keep your heating system in peak condition.

Benefits of Choosing Vaillant ecoFIT pure 835 Combi Gas Boiler

  • Energy Efficient: A-rated for heating and hot water, helping lower energy bills.
  • Space Saving: Compact design that fits in most kitchen cupboards.
  • Quiet Performance: Enjoy comfort without the noise.
  • On-Demand Hot Water: No storage cylinder needed—just instant hot water when you need it.
  • Reliable Brand: Manufactured by Vaillant, a trusted German brand with over 140 years of experience in heating technology.
  • Extended Warranty Options: Up to 10 years of coverage for added peace of mind.

Get an Instant Quote for Vaillant ecoFIT pure 835 Today

Ready to upgrade your boiler? You can receive a free, no-obligation quote online for a Vaillant ecoFIT Pure 835 combi boiler in just a few clicks.

Frequently Asked Questions

How efficient is the Vaillant ecoFIT pure 835?

The ecoFIT pure 835 has an ErP A rating and a seasonal efficiency of around 94%, making it a highly efficient choice for modern homes.

What size home is the ecoFIT pure 835 suitable for?

It’s ideal for medium-sized homes with up to 3 bedrooms and 1 bathroom.

Does the ecoFIT pure 835 require a hot water tank?

No, it’s a combi boiler, which means it provides hot water on demand without the need for a separate storage tank.

Can I use smart controls with this boiler?

Yes, it’s compatible with Vaillant’s vSMART™ and other smart thermostats for remote control and energy monitoring.

How long is the warranty for the ecoFIT pure 835?

It comes with a standard 5-year warranty, which can be extended up to 10 years with a Vaillant Advance installer.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

Who are our fitters?

We use our own Gas Safe installers and the best installers the UK has to offer. Every single one is Gas Safe registered and has been thoroughly vetted.

Get my fixed price now

Get a great price on a Which? Best Buy boiler online in minutes


We have all the best combi boilers in the UK, plus you can see the cost of a new boiler online in under 20 seconds for your peace of mind.

Here's whats included with your full Gas Safe installation boiler quote from Boiler Central.

Don't just take our word for it...

Read More Reviews