The baxi duo-tec combi he a is stylish and simple to use it has uncomplicated controls and an easy to read pressure gauge, stylish soft curves, a modern chrome strip and beautiful gloss white finish. Browse through our complete range of. Pipes and equipment that will not be the responsibility of united utilities or the local authority include:-. When sizing your boiler, there are some key factors which will influence how big an appliance you’ll need. Thank you for your excellent.