The SEFE furnace has the same exceptional features as the SEF model, but it is equipped with an electronic board that allows the modulation of the electric elements. As a result, you can enjoy a constant ambient temperature. Moreover, if you have a heat pump and if a thermal exchanger is installed in the return duct, you can also take advantage of the modulation: a constant temperature, without the variations that usually result from heat pump. The SEFE can also be installed in mobile homes using the FSB1 adapter.