Outdoor Wood Furnace Info

All-Purpose OWF Discussions => Plumbing => Topic started by: daveyjones on April 26, 2011, 06:20:03 PM

Title: max water temp going into concrete slab?
Post by: daveyjones on April 26, 2011, 06:20:03 PM

Hi, I am wondering what the max temps that are used in hydronic heating in a concrete slab. I assume I will need a tempering (mixing) valve from the woodboiler itself.

Title: Re: max water temp going into concrete slab?
Post by: willieG on April 26, 2011, 06:25:27 PM

most say a max of 85 or so ...i run mine a little hotter 95 to 100 (i have ceramic tile on the floor and they seem to take it ok)

feels nice on the feet in the middle of winter.

Title: Re: max water temp going into concrete slab?
Post by: RSI on April 26, 2011, 07:13:21 PM

I have heard 110-120.

Title: Re: max water temp going into concrete slab?
Post by: kjw58 on April 26, 2011, 07:49:29 PM

I'm heating a 32x48 pole barn with hydronic heat in the floor and I run the water in at 120-125.  Just finished up the 10th heating season with no issues, working great   :thumbup:

Title: Re: max water temp going into concrete slab?
Post by: rosewood on April 26, 2011, 08:16:36 PM

i always heard 90 deg for radiant

Title: Re: max water temp going into concrete slab?
Post by: daveyjones on April 26, 2011, 08:40:50 PM

Thanks for the input. This seems like a greatest resource on the web! Now I have spent over $2000 on propane last year.  I am considering an outdoor woodstove, due to the free firewood I have access to cutting. I am just wondering if I would be better off throttling the boiler operating temp down enough without a tempering valve. I'm just starting to draw up a diagram/schematic

Title: Re: max water temp going into concrete slab?
Post by: Gomer1 on August 22, 2011, 09:08:39 PM

I have heard too hot of water temp will ruin the floor from the ground up.....does anyone know if this is true???