A new ultra-efficient range of high output, fully condensing, gas-fired, floor-standing boilers has been launched by MHS Boilers. With best-in-class NOx emissions and efficiencies of up to 109%, the Ultramax R600 is set to become a benchmark for others to follow. The Ultramax R600 range comprises seven models with outputs from 150-571kW and utilises a proven water-cooled, down-firing, premix burner system with an all stainless steel heat exchanger assembly. Ultramax R600 boilers have a NOx emission of less than 35mg/kWh (which easily exceeds the requirements for the best BREEAM score) and can return efficiencies of up to 109%.