Jaga Low-H2O elements are designed to work with Low- water temperatures. The corrugated fins are developed with a maximum aluminium surface and large contact area with the copper tube. The fin distance is optimised to generate the best airflow through the element when using low water temperatures. Up to 16 parallel/serial tubes with specially designed collectors, allows lower water flow while reducing the pressure drop and maintaining the required turbulence. The element is based on the principle of a cross flow heat exchanger, whereby the temperature difference between the water and air is always optimal. The short contact distance between the fin and the air reduces the outlet air temperature, this maintains a laminar airflow in the element and reduces stratification in the room. This means that the warm air does not go immediately to the ceiling but mixes with the ambient room air, just where you want it to become warmer.
In general, you have to double the dimensions of the radiator when reducing the supply water temperature from 170°F to 130°F (this is approximately the point where condensing boilers become fully efficient). Doubling the Low-H2O radiators has a minimal effect on the total mass and inertia. With traditional systems, the water content and mass of the radiators becomes very high. More mass costs more energy to heat the system and increases the inertia of the system.
When reducing the water temperature, the effect of doubling the radiator dimensions is immediately clear: traditional radiators become even much slower!! Slower reacting systems consume far more energy and cannot benefit from free energy.