Available in 12, 15, 18, 24, 30, 35k W models, High Efficiency with a NOx Class 5 rating Compact, fits in a standard kitchen cupboard* The first high efficiency condensing boiler in UK with a direct rear flue option Inbuilt frost protection for the all important winter months, On board diagnostics for superior serviceability, Extensive flueing options for flexibility in installation 2 year parts & labour warranty**