The Mini-Boiler has set the bar for electric boilers and it continues to be the most popular boiler on the market today. It outperforms the competition by using quality built and reliable components that provide long lasting performance. The compact size provides an ideal fit when space is limited and it weighs less than 54 pounds. ASME certification is a stamp of approval that gives way to an industry best 20-year vessel and element warranty. The R1 models are staging boilers and are ideal for applications such as high mass radiant floor heating applications. The temperature ranges from 90°-160° F. The R1 series can heat a building up to 1500 sq. ft.