The ecoTEC plus open vent boiler is a compact, high-performance heating solution, designed for homes with traditional open-vented systems. Built in Vaillant's award-winning Derbyshire manufacturing plant, it delivers exceptional energy efficiency, reliability, and ease of installation.

Why Choose an Open Vented Boiler?

An open vent boiler, also known as a regular or heat-only boiler, is ideal for homes that use a hot water cylinder and a separate cold water storage tank, usually located in the loft. This type of system provides consistent water pressure and is perfect for households with multiple bathrooms. It’s also an ideal replacement for older open vented boilers, offering a seamless, energy-efficient upgrade.

Features:

• Compact and lightweight design – Small footprint (602mm x 375mm x 320mm) for flexible siting, including kitchen cupboard installation.
• Rear flue option – Offers greater installation flexibility in various property types.
• Large backlit plain text display – Provides clear visibility in poor lighting conditions and easy monitoring of boiler operation.
• Push-button programming – Simple and intuitive operation for effortless use.
• Built-in two-stage frost protection – Ensures reliable performance all year round.
• Push-fit flue system – Allows for quicker, hassle-free installation.
• Removable side panels – Improves accessibility for maintenance and repairs.
• Wide modulation range – Enhances efficiency by reducing energy consumption based on demand.
• Compatible with all Vaillant controls – Works with a range of smart and programmable controls, including smartphone connectivity for enhanced efficiency and convenience.
• ErP ‘A’ rated – Up to 89.2% efficiency rating (SAP 2009) for lower running costs.
• Hydrogen-ready – Successfully tested with up to 20% hydrogen blend as part of the HyDeploy project, ensuring future-proof low-carbon heating.

Guarantee Options:

• 5-year standard guarantee out of the box.
• 10-year extended guarantee when installed by a Vaillant Advance installer with a boiler protection kit.

Technical data:

• Brand - Vaillant
• Range - ecoTEC Plus
• Product Type - 435 Open Vented Boiler
• ErP Rating - A
• Wattage - 35kW
• Depth - 320mm
• Width - 375mm
• Height - 602mm
• Weight - 23kg
• Heat Exchanger Material - Aluminium
• Mounting - Wall Mounted
• Nominal Heat Output Range At 50°C To 30°C - 7.5-37.1kW
• Nominal Heat Output Range At 80°C To 60°C - 7.1-35.1kW
• Maximum Flow Temperature - 80°C
• Flow Temperature Range - 10°C To 80°C
• Flow Temperature Factory Setting - 75°C
• Approximate Condensate Volume At 50°C To 30°C - 3.57ltr/hr
• Modulation - 1:4.9 max/min
• Maximum Heat Output For Water Generation - 35.1kW
• Gas Inlet Connection (Pipe Size) - 15mm
• Heating Flow And Return Connections (Pipe Size) - 22mm
• Hot And Cold Water Connections (Pipe Size) - 15mm
• NOx Class - 6
• NOx (En 15502-2-1) - 32mg/kWh
• ErP Efficiency - 93%
• ErP Decibel Rating (Sound Power) - 53dB(A)
• Maximum Horizontal Flue Length 60/100 - 10mtr
• Maximum Vertical Flue Length 60/100 - 10mtr
• Maximum Horizontal Flue Length 80/125 - 25mtr
• Maximum Vertical Length 80/125 - 25mtr