Finally we get to the most important part of this boiler-replacing tale: the price a quick google search reveals a top-notch, a-rated condensing boiler to be around £, so why is the average price over double that? Aces: energy-saving urea process. Boilers are notoriously inefficient boiler service was something a homeowner would need to do several times throughout their life not anymore! For more information or to speak to one of our friendly team, give us a call on. Do plumbers offer a written warranty?.