We're just checking your postcode. The reliability and customer score are based on responses from a survey of 9,610 which? members about their boilers that took place in may 2017 reliability sample size (161). The energy combi boiler comes with a great range of outputs, attractive modern design, bright easy-to-use interface and a choice of controls. If your property has been affected by sewage flooding, please let us know straight away by calling.