The ecoFIT pure system boiler is a compact, high-performance heating solution designed for homes where space is at a premium. Hand-built in Vaillant's award-winning Derbyshire manufacturing plant, it delivers efficiency, smart control compatibility, and ultra-quiet operation—all in a cupboard-size unit.

Why Choose a System Boiler?

A system boiler is ideal for homes with multiple bathrooms, providing strong water pressure and a continuous hot water supply. It requires a hot water storage cylinder, ensuring multiple taps and showers can run simultaneously without pressure loss. Unlike conventional boilers, it doesn’t need a separate cold water tank, making installation more efficient.

Features:

• Compact design – Small enough to fit in a standard kitchen cupboard.
• Quiet Mark certified – One of the quietest boilers in its category.
• High-performance aluminium heat exchanger – Delivers outstanding efficiency with low energy consumption.
• Smart energy-saving technology – Modulates down to 20% of maximum output, reducing energy waste and lowering bills.
• Compatible with vSMART™ – Enables remote heating control via the internet for greater convenience.
• Flexible installation – Rear flue option provides more placement choices.
• Total system solution – Works seamlessly with Vaillant cylinders, controls, and accessories.
• ErP ‘A’ rated – High efficiency for both heating and hot water.

Guarantee Options:

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

Technical data:

• Brand - Vaillant
• Range - ecoFIT Pure
• Product Type - 618 System Boiler
• ErP Rating - A
• Wattage - 18kW
• Depth - 295mm
• Width - 390mm
• Height - 700mm
• Weight - 31kg
• Heat Exchanger Material - Aluminium
• Mounting - Wall Mounted
• Nominal Heat Output Range At 50°C To 30°C (Condensing mode) - 5.2-19.1kW
• Nominal Heat Output Range At 80°C To 60°C (Non condensing mode) - 5.0-18.2kW
• 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 - 1.84ltr/hr
• Modulation - 1:5 max/min
• Maximum Heat Output For Water Generation - 25.2kW
• Lowest Water Pressure To Operate Boiler - 0.3Bar
• Expansion Vessel Size - 8ltr
• Gas Inlet Connection (Pipe Size) - 15mm
• Heating Flow And Return Connections (Pipe Size) - 22mm
• NOx Class - 5
• NOx (En 15502-2-1) - 39mg/kWh
• ErP Efficiency - 94%
• ErP Decibel Rating (Sound Power) - 49dB(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