Archaic words have a charm that never fades away, from french sounding to wondrously mysterious ones. Combi boilers come in various outputs with a 24kw model being suitable for small homes such as flats and very small houses a 28kw boiler costs slightly more and would suit a medium-sized home such as a semi-detached house. Questions regarding your boiler cover? we've got them answered. One of our many specialist services involves clearing.