Total plumbing - providing quality. You can tell us of your complaint via. We have the perfect boiler for your home. A company where all of the gas engineers are gas safe registered. A combi (or combination) boiler is an ingenious space-saving idea, and an increasingly popular choice in uk homes in fact, combi boilers now account for well over half of all the new domestic boilers installed in britain every year. Get all your questions answered in.