The Geminox FCX oil-fired condensing boilers, specially designed for use in the United States and Canada, use a three-way mixing valve to provide maximum efficiency and have an Environmental Protection Agency energy star efficiency rating between 92 and 97 percent. The boiler features a steel, non-condensing primary heat exchanger and a stainless steel, condensing secondary heat exchanger. Geminox FCX boilers can use either inside or outside air, which passes through a concentric or split vent, for combustion.
The boiler's dual-temperature circuit combines low and high temperature applications to the same water heating system. The FCX boilers also feature built-in temperature controls, full system circulation and an expansion tank. The FCX comes in two models, the FCX22 and FCX30, both with a footprint of 27.5 inches by 23.7 inches, and thermostatic mixing valves, which prevent bacteria from contaminating the system and also prevent scalding water temperatures. Heating circuit water capacity in the FCX22 is 4.23 gallons and in the FCX30 is 6.6 gallons.
Geminox recommends the FCX boiler for radiant heating installed in floors due to its low mass and low temperature boiler. When operating with mixed outputs of 100 to 120 degrees, the FCX returns temperatures of 80 to 100 degrees.
Founded in 1987 in France, Lucky Distributing in Portland, Oregon, which has expanded burner options and boiler size to increase the range of FCX applications, imports the boilers directly from the company. Geminox products, which are sold across Europe, include gas-fueled condensing boilers, electric boilers and multi-fuel boilers that use both wood and oil.