Our website uses cookies to help provide you with the best experience tailored to your interests. To use the website with full comfort, please accept to receive all cookies on our website. For more information with regard to Cookies please see our Privacy policy.

Accept Decline

ecoTEC 46kW & 65kW (Discontinued)

ecoTEC high output boilers

  • Suitable for domestic and commercial projects
  • High quality stainless steel heat exchanger offers more resistance to oxidation and corrosion
  • All major components built-in for easy installation
  • Energy saving two-stage frost protection system and pressure sensor to monitor system pressure via diagnostics and a flow sensor
  • ErP A rated


Attention: This product is now discontinued, so if you are looking for a new product, please refer to ecoTEC plus 48 and 64kW.

With a whole host of built-in features, the installation and servicing of the ecoTEC 46kW & 65kW boilers could not be more straightforward. Lightweight for its class with a compact design and a comprehensive range of flues, fittings and accessories, the ecoTEC boiler can be sited almost anywhere.

Suitable for both domestic and commercial buildings, in addition to properties with more complex layouts. The ecoTEC 46kW & 65kW boilers can be installed in cascade to provide a flexible and extremely efficient heating system. The ecoTEC 46kW & 65kW boilers utilise modulation of the gas valve to automatically optimise heat and hot water supply according to the demands on the system.

ecoTEC 46kW is suitable for both natural gas and LPG applications. LPG conversion kits are available from Vaillant.

Please note ecoTEC 65kW is only compatible with natural gas.

Features and benefits

  • High quality stainless steel heat exchanger - Offers more resistance to oxidation and corrosion
  • Pump included and integrated connection for expansion vessel - Easy installation
  • Built-in two-stage frost protection - Ensure optimal performance all year round
  • Fully modulating low NOx burner – Lower NOx emissions are achieved
  • Easy access to all components from the front, along with a single electronic circuit board and flue gas analysis point – Repairs and servicing are easier than ever
  • All models are equipped with an air separator with auto air vent and filter – To remove fine particles
  • A full range of intelligent eBUS controls, including weather compensators and multiple boiler management control systems – To ensure your system is reliable and easy to run, whatever your requirements
  • Push-fit flue system – Simple to install
  • LPG conversion kit available – Flexibility where mains gas is not available



Technical DataUnitecoTEC 46kWecoTEC 65kW
Article number  00100178190010017820
Heat output range 80/60°CkWNG 12.3 - 44.1
LPG 12.5 - 45.0
NG 13.8 - 63.7
Heat output range 50/30°CkWNG 12.9 - 46.4
LPG 12.5 - 46.4
NG 14.6 - 67.6
Maximum heat input (net)kW4665
Minimum flow temperature °C3535
Maximum flow temperature°C8585
Nominal CH flow rate Δt = 20 K l/hr 1940 2750
ErP rating  AA
Seasonal efficiency* - NG%95.895.5
Dimensions (H x W x D) mm800 x 480 x 450800 x 480 x 472
Dry weight (includes pump) kg4675

*in accordance with the non-domestic building services compliance guide 2013

Related Products

Related Products

Domestic boiler cylinders

  • Slim line, pre plumbed and standard cylinders in the range
  • 2 year guarantee on parts and labour plus 25 year guarantee for the cylinder shell, giving you total peace of mind.
  • Can be retrofitted onto older systems meaning you can upgrade your cylinder without the hassle of the entire system.
  • Improved insulation meaning heat loss is minimised and lower running costs
  • Adjustable feet meaning the cylinder can be installed on uneven ground.

VRC 700 / VRC 700f Weather Compensating Thermostats

  • Works with our complete range of Vaillant boilers
  • Flexible time programs
  • Works with S & Y plan systems
  • Clear, high contrast backlit display