Radiant Heat & Thermostat

Kungur · Post by **Kungur** » Sun. Feb. 24, 2013 5:37 pm

Well I have been inquiring about a few upgraeds to my system. A KAA-2 with radiant floor heat. In a previuos post. Today I would kie ti=o seek advice about thermostats. Much of my system was reviewed by a hvac guy and for the most part it functions well. But when I did the install I used a regular thermostat. I would appreciate hearing from anyone, who has radiant floor heat, about the idea of switching to a thermostat that is for this type of heat. How would it help,where would I place a sensor,etc..
Thanks!

Kungur · Post by **Kungur** » Wed. Feb. 27, 2013 8:57 am

No One?

McGiever · Post by **McGiever** » Wed. Feb. 27, 2013 8:11 pm

sensor installation...

http://s3.pexsupply.com/product_files/079-install.pdf

You may not get many replies,you may be reduced to a discussion w/ a sales rep. at Pex Supply.

CoalUserWannabe · Post by **CoalUserWannabe** » Wed. Feb. 27, 2013 8:25 pm

I have been to a place in the Poconos where radiant heat is installed, and the rooms ( total 12 ) are always nice and toasty, I was told it's running on a keystoker coal boiler, the floor loop is kept at around 110-115 using an injection pump "I have no clue what that is " since my girl friend and I were just visiting somebody there and having few drinks.

Post by **Rob R.** » Wed. Feb. 27, 2013 8:29 pm

They make thermostats for radiant slabs that do a better job of keeping the temperature stable. The thermostat will "pulse" the circulator off and on to give things a chance to react...and the boiler time to catch its breath. I have a Uponor thermostat made for radiant heat leftover from my last job, it might be a good fit for your setup.

Kungur · Post by **Kungur** » Fri. Mar. 01, 2013 8:36 am

Thanks for your replies. Rob I will PM you.

Freddy · Post by **Freddy** » Fri. Mar. 01, 2013 10:42 am

Weird.... I thought I posted an answer here the day you asked 'No one?".

I'll try again....

If you have 100% radiant then a regular ol' thermostat will work just fine. But, if you have part radiant & part baseboard and an open area, the baseboard will heat faster and tell the radiant thermostat that it's satisfied. That's when a "slab-stat" comes in. A slab stat has a sensor that's IN the floor. The idea is is you keep the floor at 80 or 81 then the air stays about 69 or 70, and you will be very comfy. The water temp to keep the floor at 80 varies.... 95 or 100 will keep concrete or gypcrete up there, but wood with carpet you may be needing water temps of 140 or higher.

Sting · Post by **Sting** » Fri. Mar. 01, 2013 12:07 pm

all this electronic and digital control is wonderful -- until it don't work

suggestion -- go back and read Pumping Away
Study the part about piping temperature reducing loops

but thats just an idea - your mileage may vary

gizmo · Post by **gizmo** » Fri. Mar. 01, 2013 12:21 pm

I have all different kinds of thermostats.The
only thing that seems to matter in my set up
is the differential setting.I can't stand more than
1 Degree.It takes to long to recover if it gets
way out there.