Water Temperature For Radiant Floor Heating

When floors are conditioned within this range most people wearing normal footwear will enjoy having their feet on the floor.

Water temperature for radiant floor heating.

According to ashrae the american society of heating refrigerating and air conditioning engineers a floor temperature that creates optimal human comfort for most people lies just about at 75 f as shown in this graph. Typical radiant heat floor system operating temperatures typical radiant floor systems operate at 85 125 f water temperature entering the tubing and put the floor surface temperature about 5 degrees above the room thermostat set temperature. This includes the walls furniture and of course you the occupant of the building. You will need to be aware of the incoming groundwater temperature as cold water will drop the overall water temperature.

Water heaters are good for radiant floor heating because they maintain a low temperature. All surfaces within the room are heated to the same temperature as the floor. Water from the floors runs back into the water heater. That temperature is safe and comfortable as well as being efficient.

As warm water circulates through the tubing or as electricity warms the heating elements the concrete flooring turns into an efficient inconspicuous radiator. You really only need a maximum of 120 f for your floor. A pump kicks on and water runs from the water heater and into the floors. If you can see the numbers on the gauges in the photo the water going out is about 100 degrees and the water coming back is about 80 degrees.