How does a Gas Boiler with a wide modulation range / turn down ratio increase overall system efficiency and save energy? * 1 point The wide modulation range means the boiler can heat up really fast A wide modulation range means the boiler can keep the burner lit for longer time periods, at a low gas rate which puts less stress on components and leads to less short cycling. This increases overall efficiency as the start up procedure of a gas boiler is energy intensive. A wide modulation range means the boiler can keep the burner lit for longer time periods, at a high gas rate which puts less stress on components and leads to more short cycling. This increases overall efficiency as the start up procedure of a gas boiler is energy intensive. Modulation ranges of appliances are not important for overall system efficiency. Always install the cheapest boiler with the longest possible warranty for the customer to save money