World Health Organization tested and approved. For the past 12 years Sun Frost refrigerators / freezers have been used in more than 50 countries and have an excellent track record. Sun Frost units are very ruggedly constructed and will provide many years of reliable operation, even in the harshest environments. The Sun Frost RFVB provides a means of storing vaccines and medical supplies without the use of fossil fuels. Not only is the need for a fuel supply eliminated, but the unit operates more reliably than kerosene powered refrigerators. The RFVB can freeze 2.2 kg of ice per day, but will use approximately 50 percent more power than the figures in the chart below. The evaporator in the RFVB is protected by a fiberglass liner and cannot be punctured while defrosting, a common porblem in many manual defrost refrigerators. Also contributing to the longevity of the cooling system is the compressors low percentage of run time, only 19 percent in a 32 C (90 F) room. The RFVB is the most efficient vaccine refrigerator available. The cost of a solar power system is typically more than the cost of the refrigerator, so efficency is of prime importance in reducing system costs. 2 year limited warranty.