We got a new combi heater and tankless water heater from Convertible after both the main larger companies left us in the cold in more ways than one... after hearing all the deceit and manipulations from them we checked HomeStars and found these guys, to the point, honest, simple and fast ... don't get fooled, tricked from by the large companies. We went with the smaller honest company that does not expedite to cheap labor and call centers far away in another continent.
It was a great hassle ($$$) to get rid of the other large companies, which is where they make most of their money ... so better go with companies (like this one) that actually show you what happens after the number of years of service, rather than the other corporations that give you "discounts" in advance and "take you from behind" (after the service period (many fees) or when your system breaks down and does not have replaceable parts).
Many kudos to these guys (convertible) for being in the business for so long and providing awesome support, service, and quality! -- may you live long and prosper!