Extra heating

[nate379]

I found a ceiling mounted heater for cheap and thinking of adding it into my garage system.

Right now I have just slab heat and the recovery time is horrible.

My thought is to either splice into the garage piping after the zone valve, or add a zone valve and tie into garage heat on controller.

Would run a line voltage T stat to the heater. Set it to 55*. Garage heat set to 65*.

Main T Stat calls for heat, water runs into floor. Temp dips below 55* and the ceiling mounted heater also kicks on.

Water temp to pex is about 130*. Can I expect ok output of heater with "cold" water?

This is the heater I am looking at:
http://www.greendroplet.com/product_info.php?products_id=1186

Can get it for $250.

 

[brewchief]

If you spend some time on modines site you will find tables with how much output reduction you will see, a quick look tells me it will be cut nearly in half depending on air temp and water flow. It still may do the job just fine depending on how much extra heat you need.

 

[nate379]

Yeah looks to be around 12,000BTU. I wonder why they rate it at 200*. I don't know of many residential heat systems that run water that hot (usually see 160-180*)

I have no idea how I would calculate if that is enough heater? Anyone know?

All I need is for heater to kick up garage temp from lets say 40* to 65* in 30-40 mins.
Garage is 24x26 with 9ft ceiling, R21 walls, R60 ceiling, R19 door.
The slab heat is plenty for keeping garage warm, but when I pull cold vehicle in or door is open for a few mins it will take several hours to get the temp stabilized.