Does your boiler have a plug? if so, there’s no problem you probably have a two-phase boiler it is very easy to connect a timer to this type of boiler. Combi/combination boiler - a boiler that heats water instantly when you turn on a hot tap it does not need a water storage cylinder or water tanks in the loft. Sparkling clean with less scrubbing – find another use for your elbow grease. If you are considering.