Carpet

VancouverG

My home is 22 years old and I have a radiant heat system which thanks to some advice from others is working great at the moment.  My only issue is the master bedroom is carpeted and we like our room warm like 22.5 to 23 C.   I just can’t seem to get the temp in that room to reach past 22.5.  No other area of the house has an issue getting to 23 or 24 if wanted (ya we like it warm). Actually it does sometimes after many hours on and then I shut it off and then it may each 23.  So is it possible that the flow is just too fast? What should an ideal flow per zone.  

Jamie Hall

Carpet is an excellent insulator... you may need to run slightly higher temperature water though that one zone, if you can without damage to the floor or the carpet.

VancouverG

One thought I had was to reduce the flow by 1/4 one the pipe valve and thus reduce the flow coming in as the Taco 007 pump may be pushing too much flow.  Is that a concern or is more flow the better

hot_rod

The r value of the carpet, the pad below can be the bigger problem. They make special radiant pad, more like a dense sponge rubber instead of the bonded foam chunks.
Also the furniture in the room will limit the amount of surface area able to radiate.
Below the bed, below any dressers, etc.

VancouverG

The room is big so there is a lot of open space.  My issue is probably the pad and at this point I don’t want to rip up the carpet to change it. So I guess I’m stuck until I replace the carpet. I am currently pumping like 124F into the floor.  

bburd

Flow rate is probably not the issue if the rest of the house is heating properly, unless there is some obstruction in the cold zone. You can tell by the temperature difference between supply and return. As a rule, higher flow will give a bit more heat, but not beyond a certain point.

Others have identified the likely sources of your trouble above.

VancouverG

Ya unfortunately I think it is just the carpet as the water goes in 124 comes back 95-100 after a short time 

Mad Dog_2

This is a common problem.  You can definitely raise the temp in that zone or loop (either easily if its on its own mixing valve or a little work if u have to add one) but I've found you could "cook" the rubber padding 
And get that acrid burnt rubber smell in the room.  Go slowly.   Mad Dog. 

hot_rod

VancouverG said:

Ya unfortunately I think it is just the carpet as the water goes in 124 comes back 95-100 after a short time 

That delta should be more like 10-15 after some run time. So if you could increase flow you would get some increase in heat output.