This water heater line features high output coils in both the HF-85-XHO, with an 87-gallon tank, and the HF-115-XHO, with a 115-gallon tank. The counter flow heating coils are designed to promote more condensing when connected to high efficiency mod-con boilers. Smooth wall coils are used to minimize lime and sediment collection. Units can be easily banked together for applications with high water heating demands. Coils can take 300K to 495K BTU/HR. Tanks and coils are all 316 stainless steel construction. Heat-Flo Heating Products.