The ecoTEC pro 28kW combination boiler is a reliable, high-efficiency solution for homes with smaller heating and hot water needs. Hand-built in Vaillant's award-winning Derbyshire manufacturing plant, it combines Vaillant’s renowned quality and performance with a simple, cost-effective design.

Why Choose a Combination Boiler?

Combi boilers provide heating and hot water on demand, without the need for a separate hot water cylinder or cold water tank. This makes them an ideal choice for smaller homes, where space and energy efficiency are key considerations.

Features:

• aquaCOMFORT technology – Delivers hot water quickly at a constant temperature, reducing water wastage.
• Fully modulating low NOx burner and fan – Optimises performance for greater efficiency and lower emissions.
• Compact dimensions – At 720mm x 440mm x 335mm, this boiler offers flexible installation options, even in tight spaces.
• Hybrid-ready – Compatible with aroTHERM plus air-to-water heat pump hybrid systems, making it a future-proof heating solution.
• Highly efficient and economical to run – Achieves up to 89.5% efficiency (SAP 2008/2012) for reduced energy costs.
• Flexible flue options – 60/100 push-fit flue system, with an 80/125 adaptor for longer flue lengths and more installation flexibility.
• Boiler Plus compliant – Works with sensoHOME, sensoCOMFORT, and VRC 700 for weather-compensated heating control.
• Patented stainless steel heat exchanger – Ensures highly efficient heat transfer and superior durability.
• Built-in two-stage frost protection – Keeps the system working optimally all year round.
• Easy installation & maintenance – Front-facing component access and removable side panels make servicing straightforward.

Guarantee Options:

• Standard 2-year guarantee out of the box.
• Upgrade to a free 7-year guarantee when registered through Vaillant Advance.
• Optional 10-year guarantee upgrade available for £150 + VAT.

Technical data:

• Brand - Vaillant
• Range - ecoTEC Pro
• Product Type - 28 Combi Boiler
• ErP Rating - A
• Wattage - 28kW
• Depth - 338mm
• Width - 440mm
• Height - 720mm
• Weight - 38kg
• Heat Exchanger Material - Stainless Steel
• Mounting - Wall Mounted
• Nominal Heat Output Range At 50°C To 30°C (Condensing mode) - 5.9-25.9kW
• Nominal Heat Output Range At 80°C To 60°C (Non condensing mode) - 5.2-24.0kW
• Maximum Flow Temperature - 85°C
• Flow Temperature Range - 30°C To 85°C
• Flow Temperature Factory Setting - 75°C
• Approximate Condensate Volume At 50°C To 30°C - 1.9ltr/hr
• Modulation - 1:5 max/min
• Maximum Heat Output For Water Generation - 27.2kW
• Lowest Water Pressure To Operate Boiler - 0.8Bar
• Lowest Water Flow For Operation - 2.0l/min
• Lowest Water Pressure For Maximum Flow Rate - 0.8Bar
• Domestic Hot Water Flow Rate (at DT = Δ35K) - 11.1l/min
• Hot Water Output Temperature Range - 35˚C To 65˚C
• Expansion Vessel Size - 8ltr
• 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) - 33mg/kWh
• ErP Efficiency - 93%
• ErP Decibel Rating (Sound Power) - 49dB(A)
• Maximum Horizontal Flue Length 60/100 - 12mtr
• Maximum Vertical Flue Length 60/100 - 16mtr
• Maximum Horizontal Flue Length 80/125 - 39mtr
• Maximum Vertical Length 80/125 - 41mtr