Are there any downfalls to combi boilers? Andritz designs and delivers boilers using a range of fluidized bed technologies these boilers are distinguished by capacity, fuel, and application. We have a model and output of boiler for every home. Four oz beers of your choice! We will carry out functional tests on the drain once it is unblocked to give confidence that you are not calling them again next week for the same problem. I don't have.