The Vaillant ecoTEC Plus 424 is a highly efficient open vent (heat-only) boiler designed for traditional heating systems that use a hot water cylinder and loft tanks. With a 24kW output, it is perfectly suited for medium to larger homes requiring reliable heating, low running costs, and the premium engineering Vaillant is known for.

This ErP-compliant boiler combines excellent efficiency, quiet operation, and long-lasting performance—making it an ideal upgrade solution for older open-vented boilers.

Key Features

• 24kW output – ideal for medium to large homes

• ErP A-rated efficiency to help reduce energy bills

• Quiet Mark approved for ultra-quiet operation

• Advanced modulation technology for consistent heat and energy savings

• Traditional heat-only design – works with cylinders and loft tanks

• Durable aluminium heat exchanger for long service life

• Clear digital interface offering easy control and diagnostics

• Built-in frost protection for loft or garage installations

• Compact, lightweight design for easier fitting

• Premium Vaillant quality, trusted throughout the UK

Ideal For

• Homes with an existing open-vented system

• Properties with a hot water cylinder

• Medium to large homes needing a reliable 24kW heat-only boiler

• Customers seeking a premium, quiet, and efficient boiler

What’s Included

• Vaillant ecoTEC Plus 424 Open Vent Boiler (ErP)
  (Flue, controls, and accessories sold separately)

Why Choose the ecoTEC Plus 424?

With powerful performance, excellent fuel efficiency, and Vaillant's renowned reliability, the ecoTEC Plus 424 is a top choice for homeowners upgrading from older heat-only boilers. Its quiet operation and advanced modulation deliver superior comfort and efficiency year-round.