Unlike ducted heating systems, Hydronic Heating Systems don’t have ducts to spread dust, dust mites, germs, odours and noise. Hydronic Heating is recommended by Asthma Support Organisations and other health professionals. Hydronic Heating operates on the principle of radiation and convection. The two principles result in a natural healthy system that produces luxurious, efficient heat. There are no hot spots and the heat is not only comfortable, it is healthier.