Available in 24k W, 30k W or 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 No need to wait for hot water with a 5-second** hot water response Optional glide down plug in timer, all the functionality of an external timer without the need for extra wiring Inbuilt frost protection for the all important winter months, The Flexicom cx combi boiler has on board diagnostics for superior serviceability, Extensive flueing options for flexibility in installation 2 year parts & labour warranty+