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Radiant Heat - Boiler Working Overtime? Furry 12-30-2006
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Posted by Edwin Pawlowski on December 31, 2006, 2:20 pm

>
>>If the heater is firing for 2 hours at 30,000 Btu, it is using the same
>>amount of fuel as a burner firing at 150,000 Btu for half that time.
>
> No. The former uses 60K Btu. The latter uses 75K Btu.
>

Of course. What I typed is not what I was thinking. Point is, firing time
alone is not the determining factor for cost of operation. Longer time at a
lower rate can be cheaper than a huge inefficient burner cycling.



Posted by Matt Whiting on December 31, 2006, 2:46 pm
nicksanspam@ece.villanova.edu wrote:

>>If the heater is firing for 2 hours at 30,000 Btu, it is using the same
>>amount of fuel as a burner firing at 150,000 Btu for half that time.
>
>
> No. The former uses 60K Btu. The latter uses 75K Btu.

No, the latter uses 150,000 Btus since half of two hours is one hour.


Matt

Posted by CWatters on December 30, 2006, 3:32 pm

> Folks,
>
> We have a 1200 sq ft full basement that we're heating via radiant heat.
> There are 4 runs of Pex. We're very happy with it but I'm worried that
> there is something wrong with the system. When the basement calls for
> heat the pump turns on and I can see the temperature gauge go up to
> around 100-110 degrees. There's no gauge on the return but feeling the
> Pex it's obvious that the water coming back is pretty cool. The
> problem: It takes at least an hour, sometimes 2, for the basement to
> warm up enough that the thermostat stops calling for heat. 1200 sq ft
> is a lot of concrete to heat up but isn't that a long time?
>
> Any thoughts much appreciated.
>
> Thanks, Bill
>

The best way to run this type of system might be to have it on all the time
but program in a reduced temperature at times when it would normally be off.
Normally done with a programmable thermostat that has a "set back" feature.



Posted by DK on December 30, 2006, 3:51 pm

>Folks,
>
>We have a 1200 sq ft full basement that we're heating via radiant heat.
>There are 4 runs of Pex. We're very happy with it but I'm worried that
>there is something wrong with the system. When the basement calls for
>heat the pump turns on and I can see the temperature gauge go up to
>around 100-110 degrees. There's no gauge on the return but feeling the
>Pex it's obvious that the water coming back is pretty cool. The
>problem: It takes at least an hour, sometimes 2, for the basement to
>warm up enough that the thermostat stops calling for heat. 1200 sq ft
>is a lot of concrete to heat up but isn't that a long time?
>
>Any thoughts much appreciated.
>
>Thanks, Bill

Actually, that is much faster than most systems.

Consider yourself lucky.

Get a programable thermostat.


Posted by indago on December 30, 2006, 4:49 pm
061230 1341 - Furry posted:

> Folks,
>
> We have a 1200 sq ft full basement that we're heating via radiant heat.
> There are 4 runs of Pex. We're very happy with it but I'm worried that
> there is something wrong with the system. When the basement calls for
> heat the pump turns on and I can see the temperature gauge go up to
> around 100-110 degrees. There's no gauge on the return but feeling the
> Pex it's obvious that the water coming back is pretty cool. The
> problem: It takes at least an hour, sometimes 2, for the basement to
> warm up enough that the thermostat stops calling for heat. 1200 sq ft
> is a lot of concrete to heat up but isn't that a long time?
>
> Any thoughts much appreciated.
>
> Thanks, Bill
>
Turn the water temperature up to 140°


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