Bryan Steam LLC has introduced the HE-RV Series of forced draft gas fired, “Flexible Water Tube” boilers. The HE-RV Series offers a guaranteed efficiency of 85%, with the high combustion efficiency resulting from a uniquely designed integrated surface heat extractor. These boilers features 7 sq. ft. of heating surface per boiler horsepower. They operate under normal operating temperatures, without needing to provide for the expense of complications of special venting and/or condensing material. The HE-RV Series is available in eight models with inputs from 3,500 MBH to 8,000 MBH. The Bryan “Flexible Water Tube” design provides for extremely fast internal circulation for maximum heat transfer and operating efficiency. The flexibility of the bent water tube design also eliminates all possible damage from “Thermal Shock” and from stresses caused by poor or unequal internal circulation. This feature is especially important for forced hot water heating systems designed for higher temperatures and greater temperature drops.