It may appear difficult to size an electric boiler for radiant heat, but it does not have to be. Hiring a professional is the best way to ensure that you get the right size unit for your needs. In general, the number of loops in the system will determine how much BTU output your boiler requires. You can be confident that your radiant heating system will be a good fit by taking into account multiple variables such as insulation levels, climate, and living space size. Furthermore, experts advise overestimation when calculating BTUs to avoid problems with insufficient boilers later on.