Turn thermostat down or leave steady?

Posted by Frank on October 30, 2009, 9:02 am

Stormin Mormon wrote:

> Boilers are typically left hot, so there isn't a bunch of
> humidity in the boiler, rusting it out. And, boiler systems
> often do take a LONG time to recover temp.
>

I usually think, forced hot air. Boiler, I don't know but imagine water
in tank would keep fairly hot if not circulated. Thermodynamically,
turning temperature down saves energy.

Posted by mm on October 30, 2009, 8:29 pm

On Fri, 30 Oct 2009 08:18:35 -0400, "Stormin Mormon"

>Boilers are typically left hot, so there isn't a bunch of
>humidity in the boiler, rusting it out. And, boiler systems
>often do take a LONG time to recover temp.

Yeah, but do you have one? His first answer assumed you did.

>--
>Christopher A. Young
>Learn more about Jesus
> www.lds.org
>.

>>Boiler installers never put daily "set back" thermostats on
>>boilers,
>>only forced air systems get those, and they tell you to set
>>the
>>thermostat once and leave it there.

>Why did you assume the Mormon had a boiler?

>>The rules are completely different for radiant heated
>>buidings vs air
>>heated buildings.

Posted by Stormin Mormon on October 30, 2009, 9:32 pm

My heat source is a 90% downflow hot air furnace.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

On Fri, 30 Oct 2009 08:18:35 -0400, "Stormin Mormon"

>Boilers are typically left hot, so there isn't a bunch of
>humidity in the boiler, rusting it out. And, boiler systems
>often do take a LONG time to recover temp.

Yeah, but do you have one? His first answer assumed you
did.

Posted by DD_BobK on October 29, 2009, 9:51 pm

> > >> No, it takes too long to re-heat the boiler and all the water in the
> > >> pipes, radiators, and floor tubing. =A0It is always best to set it o=

nce

> > >> and leave it there all winter. =A0Too much energy is lost when all t=

hat

> > >> water is asked to re-heat all the surfaces again. =A0For example whe=

n I

> > >> feel the return manifold from the coils under my concrete slab after
> > >> the slab was allowed to cool, the return water is ice cold, all that
> > >> energy to reheat the slab. =A0No, bad asvice, best to keep it warm a=

> > >> leave it there, saves tons of energy.

> > We use warm water here to shower. =A0I'd say that a higher % of people =

use

> > heat pumps or gas to heat rather than water. =A0In your case, MAYBE it =

> > cheaper to leave it on, but I think you are only quoting yourself, and =

> > analytic studies by any testing agency. =A0Can you find any said studie=

s? =A0I

> > don't doubt that you believe what you say is true, I just think that it=

> > not.
> > Steve

> Boiler installers never put daily "set back" thermostats on boilers,
> only forced air systems get those, and they tell you to set the
> thermostat once and leave it there.
> The rules are completely different for radiant heated buidings vs air
> heated buildings.
> In an air heated building you heat the air, in a radiant heated
> building you heat the building materials and that in turn heats the
> people. =A0When you lose all that stored energy it costs a fortune to
> recover it back in boiler usage. =A0There is nothing quite like the
> warmth of a radiant-heated house.

So the laws of themodynamics are different from system to system?

Heat its lost to the environment based on the difference in
temperature between the heated space & the unheated space. As the
temperature of the heated space falls, the heat loss also fails. When
the temperature of the heated space falls to that of the unheated
space, heat loss stops.

I believe you are confusing the "time" it takes to recover with "huge
amounts of energy are required to re-heat everything".

If you were correct in your thinking (& oyu are not) the whole concept
of temperature setback would not work (& it does).

cheers
Bob

Posted by mm on October 29, 2009, 11:30 pm

wrote:

>So the laws of themodynamics are different from system to system?
>Heat its lost to the environment based on the difference in
>temperature between the heated space & the unheated space. As the
>temperature of the heated space falls, the heat loss also fails. When
>the temperature of the heated space falls to that of the unheated
>space, heat loss stops.
>I believe you are confusing the "time" it takes to recover with "huge
>amounts of energy are required to re-heat everything".
>If you were correct in your thinking (& oyu are not) the whole concept
>of temperature setback would not work (& it does).
>cheers
>Bob

I think part of this is because we tend to think of the heat needed to
heat something from the outside temp to what we want inside. But
what the furnace does most of the time is just replace heat that is
lost to the outside. And still it runs a lot.

So it runs even more when it has gotten colder than normal inside,
because it was on setback. But it has run not at all perhaps or much
much less the entire time people were out and the thermostat was set
back.

Looked at another way, the furnace is usually just raising the temp
one or two degrees, from the temp at which it turns on, 67^? to where
it turns off, 69^?, and still it runs a lot when we are home

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Turn thermostat down or leave steady? - Page 3