Ge’s ultra-supercritical boilers contribute to cycle efficiencies of 44 to 48% lhv basis, significantly reduces both fuel and emission control costs for our customers. Includes annual boiler service & safety check). So for superior standard workmanship at cost-effective prices, look no further than rudkin and herbert! simply give our friendly team a call today for more information. With a typical boiler installation costing anywhere between £3,000 and £5,000, here are five.