Garage Addition Heating

[rompn63]

I just purchased a new home with an unheated 20' wide by 28' deep attached garage. I plan to add a 20' x 24' addition to the rear of it. This will give me a 52' x 20' garage/shop. I plan to install heat in the floor of the addition since I spend every evening in the shop. I'm pretty sure the heated floor in the new shop will not heat the whole garage. I was thinking that I would need to install a small hanging gas heater in the garage to keep that section from drawing the heat from the shop area. Can't afford to tear out the present floor untill I hit the lottery. I live in northwest Indiana.
Any thoughts?

 

[Garys Garage]

How is Crete Il North west Indiana? I just added a 15x30 Addition to my shop, now 30x48 I did add tubes to my floor but have not hooked them up yet. It seems to heat ok now since I insulated.

 

[rompn63]

Sold my home in the Land of Blago and bought in NW Indiana. Property taxes are almost $7000 per year less here in Burns Harbor.
I had heat in the floor of my last garage and I would never be without it.
I was thinking of using an on demand water heater instead of a 40 gal water heater. I thought it would save some space.

 

[ScaldedDog]

Mine is a sample of one, but I was surprised at how much heat my existing 20x20 garage retained when I heated the floor of 33x31 garage I attached to it. If the new garage area is 60*, the old never falls below about 52*, and it used to get down to about freezing. YMMV, of course.

Mark

 

[sillyhillbilly]

Sold my home in the Land of Blago and bought in NW Indiana. Property taxes are almost $7000 per year less here in Burns Harbor.
I had heat in the floor of my last garage and I would never be without it.
I was thinking of using an on demand water heater instead of a 40 gal water heater. I thought it would save some space.

most of the on demand have max volume flow issues, i have seen 4 gallons per minute at 135 degrees or 6 GPM at 106 degrees, if you need more volume you can add more units in parrallel, however the gas piping gets larger as well

 

[rompn63]

Thanks for your help. I guess I will wait until the first heating season before I add a the extra hanging heater.

 

[rompn63]

Its has been a year since I posted about heating my garage addition.
I added an extra 6 feet of depth for a total of 30' deep by 20' wide. This area has two 300' loops of 1/2" pex for a total of 600'. I'm using a Takagi JR on demand natural gas heater to supply the hot water. I fired the system up in early November and it works great. There is enough heat output from the slab to also heat the 20' by 28' old section. I keep the shop area at 55 degrees and the old section stays within a couple of degrees of the new addition.
I have 3 1/2" insulation in all the walls, 12" in the ceiling, and 2" rigid foam under the slab and around the perimeter. The only area not insulated is the slab in the old section.
I'm so happy with the system that I sold the hanging heater I was going to use for the old section.

 

[HoosierBuddy]

Cool. In-floor radiant is the berries.

Phil