Applications Circulation of hot or cold water in • Heating systems • Domestic hot water systems • Cooling and air-conditioning systems.The valve works at lower temperatures than radiator systems with temperatures between 35*C to 65*C depending upon the construction of the floor.The blending valve is the heart of the control system with hot water from the boiler mixed to supply water at the correct temperature back to the underfloor pipework.The supply temperature of the water can be adjusted to suit the construction of the floor.