Often, it happens that in the cold season the heating power of an ordinary apartment battery is not enough to maintain a stable high temperature in the house, and residents, for normal and comfortable life, have to either change the heating system or come up with some ways to increase the heat in the house.
As practice shows, simply repainting the battery in a dark color is quite effective. Despite the doubtfulness of this method, in a new guise, its heat transfer is insignificant, but increase. Also, increasing the area of the radiator with the help of aluminum casing, you will greatly increase the heat concentration, since aluminum has the property of heating up very quickly.
Usually, the batteries are located close to the walls with windows - the coldest sides of the room, closest to the external, cold environment. Because of this factor, most of the generated heat goes practically nowhere, trying in vain to heat a constantly cooling wall. To prevent this from happening, it is necessary to place a foil layer on the wall behind the battery, and, if possible, put a heat-reflecting screen on the floor. Thanks to this method, hot air will go in the right direction, and the screen, which is prone to heating, will also give off heat.
One way or another, if you still do not have enough heat, and the purchase of additional electric heaters is not entirely justified in your opinion, then still the best solution would be to replace the battery with a newer and better model. After all, cold is not very favorable for a person, and he can once again contribute to disease.