Why 3 Tubes?

The 3 tube Contra-Flow principle means that there is 30-50% more warm surface area than with twin or single tube systems. The two 'outside' tubes flow in the opposite direction to the centre tube.. Meaning that where the centre tube is coolest (at the return) then the 2 outers are at their warmest, and vice-versa. However after a few minutes operation water temperature is equalised in all three tubes by temperature with no 'cold spots' (a major drawback of the single direction system).

This method of heat transfer is faster than any other floor heating tube system. With the relatively low water content of the KEE Triple Tubing and the higher flow velocity back to the boiler a natural consequence is a much faster floor warm up time.