boilers are more expensive than furnaces mid efficiency boilers cost anywhere from $ 2500 to $ 4000 while high efficiency boilers run $ 5000 to $ 10000 those prices include installation but keep in mind that installing a boiler is more expensive than installing a furnace because the process is more complexhe furnace itself usually costs $ 1000 to $ 1500 while labor adds an additional $ 1000 to $ 2000 very high efficiency models can cost $ 5000 or more to buy and install removal and haul away of the old furnace usually costs $ 300 to $ 1000 depending on size and difficulty