W3TH water-mixing temperature control center for floor heating systems is a kind of combined-type ratio adjustable water-mixing unit specially designed for different heating systems such as central heating and independent heating. It can set supply water temperature according to the temperature requirements of the heated rooms, control three-way water-mixing valve via central smart thermostat to automatically adjust the mixing ratio of the primary and secondary water flow or control and adjust the ratio of supply and return water via smart water pump and manual water-mixing valve, so as to reach the constant supply water temperature and flow of the secondary system and fulfill the requirements of optimum energy-saving heating and comfort. This product possesses water shortage & frost protection functions and the characteristics such as simple control setting, small size, easy installation, safe and reliable performance as well as comfort and energy saving.