Radiator is not hot for three reasons:

1, pipeline, pipe impassability is;

2, pressure is insufficient, pipe network pressure is not enough, lead to circulation;

3, and blockage of the radiator. This case is clear radiator is the best way.

Generally a bit, but not much; If it's convenient to be clean, if very trouble not to clean it. Because they do not heat must be the front of the heating system has a problem, or the process is too long, you in the further. Not hot there are many reasons for this, if is caused by blockage problem within the radiator is not hot, when cleaning can solve the problem!