A heat emitting radiator for heating a space is provided that includes a radiator panel with tubing forming a fluid circuit or loop, wherein the loop includes at least one opening for inserting a heating element that can heat a fluid in the fluid circuit. The radiator may also include a heat absorbing material, such as stone, in thermal contact with the radiator panel. The radiator can be selectively de-activated when a certain temperature has been achieved in the space or in the fluid, allowing heat absorbed by a heat absorbing material positioned within the radiator to then be radiated into the space. The radiator can then be re-activated when a selected low temperature has been reached. The heating element may be a DC electrical heating element configured to be connected to an AC power source.