From a cold start-up, how long do you estimate it takes to heat up your slab? Just trying to get some base time frames of what others have seen. I have a 960 sq/ft, 5" slab that I'm heating with two 300' loops. Currently running 120 degree into the slab. The system started up (consistently that is!) at about 8PM last night. I didn't lose a single degree of heat in the garage even though I do not have seals around the doors yet and we had a windchill of about 8 degrees last night. I am tempering the water right now until everything is fully heated, but at 5:30 this AM the return line was coming back luke warm. I'm guessing the mixture was about 40 degrees when we started last night.
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How long until the slab is warm?
- Thread starter ikessky
- Start date
overdriv
Well-known member
I have a little over 1000 sqft. heated with PEX and 720 sqft. not heated, connected. Started it Feb 1st this year, temperature outside was in the teens and a blizzard.
If I remember correctly, the 40 Gal water heater ran steady for about 36 hours to get the air temp in my garage to 60*. But after a few hours into the run, I figured out that I was circulating the water to fast, so slowed the pump to low speed and then got a 20* drop in the returning water temp.
After balancing my loops it usually runs at a 15* drop with the floor up to temp.
This fall when the slab got to be 60*, I turned the system on and walked away. The thermostat is set on 62* and it varies very little, even when we drive a cold car into the non-heated part. It is such a great heat. If you are working in there, 62* seems to be about the most comfortable.
Good Luck!
If I remember correctly, the 40 Gal water heater ran steady for about 36 hours to get the air temp in my garage to 60*. But after a few hours into the run, I figured out that I was circulating the water to fast, so slowed the pump to low speed and then got a 20* drop in the returning water temp.
After balancing my loops it usually runs at a 15* drop with the floor up to temp.
This fall when the slab got to be 60*, I turned the system on and walked away. The thermostat is set on 62* and it varies very little, even when we drive a cold car into the non-heated part. It is such a great heat. If you are working in there, 62* seems to be about the most comfortable.
Good Luck!