Vaillant ecoTEC Plus 835

Type Combi boiler
Fuel Gas
Efficiency Rating A
Standard Warranty 2 years (or up to 10 years when registered through Vaillant Advance)
Weight 38kg
Width x Height x Depth 440mm x 720mm x 372mm
Max kW Output 38kw
Flow rate 14.3l/min


The ecoTEC Plus 835 is in our opinion, an efficient boiler that has the potential to improve your central heating system at home thanks to its modern features.

It has been developed by one of the UK’s leading boiler manufacturers and has compact dimensions that allow it to be slotted easily into a small kitchen in a home that has a reasonable demand for hot-water.


Product description

The ecoTEC Plus 835 is a compact boiler with modern specifications that could make it a suitable option for homeowners looking for energy-efficiency and convenience. It’s typically suited to medium-sized homes thanks to its enviable 35kW power output.

It also boasts an energy efficiency rating of A, which could make it perfect for modern homeowners that hope to have the potential to save on energy**.


Ratings & Reviews

Vaillant’s ecoTEC Plus 835 has received many a stellar rating over the years and continues to draw the plaudits thanks to its high performance. Here are a few of the awards it has received recently:

  • 5-star efficiency rating
  • 5-star brand customer score
  • 5 stars for ease of repair
  • 5 stars for ease of service
  • 5 stars for build quality


*Source: Which as of 03/09/2018.


Similar Alternative Models

Comparing models is always a good idea when it comes to buying a new boiler. Below we’ve outlined a few units that have similar specifications, features and benefits to the ecoTEC Plus 835 from Vaillant. Take a look to make a more informed decision:

1. Worcester Bosch Greenstar 36CDi

  • Up to 10 years’ warranty through HomeServe***
  • Energy efficiency rating of A
  • User friendly display

2. Vaillant ecoTEC Plus 838

  • Typically more suitable for larger homes with higher demand
  • Significant flow rate of 15.9 litres per minute
  • Slightly bigger at a depth of 406mm (versus 372mm)

3. Ideal Logic 30kW

  • Lower flow rate of 12.4 litres per minute
  • A lighter unit at 33.8kg
  • Digital display with a compact design

If you are looking to find a new boiler to install into your home, you could get an indication of how much it might cost by using our free online quote tool today.


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** Source: Saving calculated when replacing G-rated with A-rated boiler in a semi-detached house.

*** Subject to an annual service at the customer's expense. Warranty extension from 5-years to 10-years only available on Worcester Bosch and Ideal gas boilers.