Radon mitigation systems: is your home safe? So, although there are some disadvantages, in general the benefits of having a combi boiler installed are many, and this is why so many people prefer them. Click save and you are done! Foundation fixed a loud, running toilet and a leaking water source valve it now fills quickly and quietly the entire job took a little over an hour the technician was very friendly, professional, and courteous. Your boiler is at the heart of your home and is a complicated piece of machinery.