Features and benefits

NOx emissions below 40mg/kWh
NOx emissions of 40mg/kWhr
Seasonal Efficiency (L2B) 320kW 96.4%, 395kW 96.8%, 470kW 96.7%, 545kW 97.0%, 620kW 96.8%
Boiler outputs from 320 - 620kW
Suitable for cascading of multiple boilers
Controls can be installed at the side or on the front of the boiler
Suitable for use with RC35 (single boilers) or 4000 series controls
EMS control with auto-diagnosis system
Aluminium/Silicon heat exchanger
Water-side stream optimised for effective and robust operation
No minimum water volume circulation
Simple commissioning and maintenance
Fully modulating pre-mix burner
Sealed combustion operation possible
Efficiency of 109.7% at 40/30°C
Maximum operating pressure of 6 bar
Extremely quiet, operates at 55dB(A) at full load
Weight (depending upon output) 410kg to 520kg
Easy transport, assembly and installation
Can be installed in either orientation to suit the plant room layout.

High performance commercial heating

A high efficiency condensing boiler, perfect for single or multiple boiler installations in medium to large buildings including schools, hotels, care homes, offices and commercial buildings.

Compact, quiet and perfect for both new build and renovation projects.

It combines high efficiency and low emissions with a wide range of practical benefits.

Performance with economy

Available in 5 outputs – 320kW to 620kW – the GB402 has been developed to provide lower running costs and reduced carbon and NOx emissions.

This is achieved through the use of a powerful, lightweight cast aluminium heat exchanger and thermally insulated boiler body.

The clean burning, pre-mix burner and intelligent combustion controller enable the GB402 to operate in a wide modulation range of between 20% to 100%, with a seasonal efficiency of up to 110%.