The Vaillant ecoTec Plus 418 is a high-efficiency open vent (heat-only) boiler designed for traditional heating systems with a hot water cylinder and loft tanks. With a 18kW output, it is perfectly suited for medium-sized homes that require reliable heating performance, excellent fuel efficiency, and the premium build quality Vaillant is known for.

This ErP-compliant boiler offers ultra-quiet operation, advanced modulation, and exceptional reliability—making it a favourite among installers and homeowners upgrading older open-vented boilers.

Key Features

• 18kW heating output – ideal for medium-sized homes

• ErP A-rated efficiency for lower running costs

• Quiet Mark approved for very quiet operation

• High modulation ratio to reduce cycling and improve comfort

• Compatible with traditional open-vented systems

• Durable aluminium heat exchanger for optimal performance

• Clear digital display for easy user control and diagnostics

• Frost protection, suitable for loft or garage installations

• Compact, lightweight design for easier fitting

• Premium Vaillant engineering for long-term reliability

Ideal For

• Homes with an existing open-vent hot water system

• Properties using a hot water cylinder

• Medium homes needing an 18kW heat-only boiler

• Customers wanting high efficiency and premium build quality

What’s Included

• Vaillant ecoTec Plus 418 Open Vent Boiler (ErP)
  (Flue and accessories sold separately)

Why Choose the ecoTec Plus 418?

This model delivers an excellent balance of performance, quietness, and energy efficiency. With Vaillant’s advanced engineering, the ecoTec Plus 418 ensures reliable heating, reduced fuel usage, and long-term durability—making it an ideal upgrade for older heat-only boilers.