Max BTU's

Andy_14

What is the max btu's per sq.ft. you can get out of a bare concrete slab without it being to hot for bare feet?

hr

Inside or out?

Snowmelt systems can provide 150-175 BTu/ sq foot The wider the delta t between floor surface temperature and air temperature, the greater the output.

Inside a home depends on the surrounding air temperature. A rough rule of thumb is 2 btu for every degree of difference between floor temperature and air.

Floor surface temperature for constant residential use is generally 85° or less. Some commercial spaces may run higher temperatures.

So 85° floor temperature with 68° air would output about 34 btu/ square foot.

The RPA RadPad is a hand calculator for this type of exercise Think you can buy one at Books and More, here.

hot rod

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Andy_14

Could I get away with 95 degree bare concrete floor temp and still be able to walk on it with bare feet?

Unknown

Over 90 it starts to get a little uncomfortable.

If you have a bare concrete floor though your water temps are low, and you could add a little radiant wall or ceiling with no additional mixing to shift some of the load off the floor, as one alternative.

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Mike T., Swampeast MO

It would not be comfortable--in fact it would be oppressive.