I have a 20 year old Slant Fin boiler and had been told it would be difficult to find anyone still working who knows that system. Not so! Turns out Hander has two repairmen dedicated to Slant Fins. Brian came right out when I needed some work done, checked out my boiler, knew exactly what was going on, went to get the part and came right back, all taken care of within a few short hours. I'm writing this when we're having below average temperatures and below freezing days so what a relief when my problem was solved so quickly. I'm a Hander fan for life! I have complete confidence in them, their repairmen, and their knowledge base.