I have many Alpha combination boilers and have fitted nothing else in our portfolio of rental houses for the last 25 years. They are reliable and generally cause few problems. When something does break down the service from Alpha is good and an engineer is sent out quickly. My recent experience had the boiler fixed within half an hour by the very knowledgeable Alpha enginner Lee Taylor-Winder. He quickly identified the issue and had the necessary parts with him on his van. Very helpful to have a phone call half hour before he arrived and a very friendly and professional engineer.