Why, a plumber would be ashamed to take as long as that over a job! Full boiler service, need all... Call today for your free estimate! We've been keeping you comfortable for four generations. All the clever stuff is included inside, so you don’t need to find space for a cold water expansion tank in the roof or a hot water storage cylinder in the airing cupboard or anywhere else in your home so that’s good news! The most common types existing in the uk are the oil and gas combi boilers.