VAILL ECOTEC+ 637 NG ERP SYS 10021835

The Vaillant ecoTEC plus 637 System Boiler (Natural Gas) is a high-efficiency, wall-mounted condensing boiler designed for sealed heating systems. With up to 37 kW central heating output, it provides reliable performance for homes with higher heating demands. As a system boiler, it supplies heating only and works with a separate hot water cylinder for domestic hot water.

Engineered by Vaillant Group UK Limited, this ErP A-rated appliance uses advanced condensing technology and a modulating burner to optimize energy use and maintain steady, comfortable temperatures. Its compact, quiet design and smart control compatibility make it suitable for both radiator and underfloor heating systems when correctly specified.

The unit integrates key hydraulic components typically required for a sealed system, helping to streamline installation. It’s compatible with Vaillant controls and accessories and requires an appropriate flue kit and cylinder for a complete system.

• Brand: Vaillant
• Model: ecoTEC plus 637 System Boiler (NG)
• Manufacturer: Vaillant Group UK Limited
• Manufacturer part number: 10021835
• Fuel: Natural Gas
• Boiler type: System (heating only; separate hot water cylinder required)
• Nominal central heating output: up to 37 kW
• Efficiency: ErP A-rated, condensing
• Wall-mounted, compact and quiet operation
• Integrated components for sealed systems (e.g., pump and expansion vessel)
• Compatible with Vaillant smart controls and standard heating systems
• Suitable for medium to large homes when correctly specified