At present I have my CH Wireless Thermostat situated in the Hall . I
am about to replace the hall rad and am wondering if this is the best
place for the thermostat.
Is there an ideal place to fit it and what are the reasons for
fitting it in one area as opposed to another ?
I know about not having a TRV on the rad(s) in the room where the
thermostat is .I have one rad in the hall,one in each of two bedrooms
and two in the living room .One is in the kitchen but will soon be
either moved or done away with altogether as it doesn't really get
cold .

On Wed, 12 Nov 2008 13:24:45 +0000 someone who may be
wrote this:-

At present I have my CH Wireless Thermostat situated in the Hall . I
am about to replace the hall rad and am wondering if this is the best
place for the thermostat.
Is there an ideal place to fit it

Possibly, though where is ideal depends on the building and its
orientation.

and what are the reasons for
fitting it in one area as opposed to another ?

Some pointers:

1) don't have it in a room with supplementary heating (including a
kitchen)

2) don't have it in a room with excessive solar gains

3) have it somewhere you want heated all the time (avoid a little
used dining room)

A hall or north facing bedroom can be good places.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

On Nov 12, 1:42*pm, David Hansen
wrote:
On Wed, 12 Nov 2008 13:24:45 +0000 someone who may be
wrote this:-

At present I have my CH Wireless Thermostat situated in the Hall . I
am about to replace the hall rad and am wondering if this is the best
place for the thermostat.
Is there an ideal place to fit it

Possibly, though where is ideal depends on the building and its
orientation.

and what are the reasons for
fitting it in one area as opposed to another ?

Some pointers:

1) don't have it in a room with supplementary heating (including a
kitchen)

2) don't have it in a room with excessive solar gains

3) have it somewhere you want heated all the time (avoid a little
used dining room)

A hall or north facing bedroom can be good places.


before TRVs I woudl have said that you put the thermostat at the
place where you want the temperature to be most constant - in the
living room for example.

But with TRVs doing the temperature control in each room why do people
have thermostats any more? If it's to turn the heating system on in
cold weather then perhaps it should actully be outside!

Robert

"RobertL" wrote in message
...
On Nov 12, 1:42 pm, David Hansen
wrote:
On Wed, 12 Nov 2008 13:24:45 +0000 someone who may be
wrote this:-

At present I have my CH Wireless Thermostat situated in the Hall . I
am about to replace the hall rad and am wondering if this is the best
place for the thermostat.
Is there an ideal place to fit it

Possibly, though where is ideal depends on the building and its
orientation.

and what are the reasons for
fitting it in one area as opposed to another ?

Some pointers:

1) don't have it in a room with supplementary heating (including a
kitchen)

2) don't have it in a room with excessive solar gains

3) have it somewhere you want heated all the time (avoid a little
used dining room)

A hall or north facing bedroom can be good places.


But with TRVs doing the temperature control in each room why do people
have thermostats any more? If it's to turn the heating system on in
cold weather then perhaps it should actully be outside!

Robert

Possibly because a thermostat 'tells' the boiler when it needs to fire
up/down, a TRV closes the flow to the rad.

Don.

"RobertL" wrote in message
...
On Nov 12, 1:42 pm, David Hansen
wrote:
On Wed, 12 Nov 2008 13:24:45 +0000 someone who may be
wrote this:-

At present I have my CH Wireless Thermostat situated in the Hall . I
am about to replace the hall rad and am wondering if this is the best
place for the thermostat.
Is there an ideal place to fit it

Possibly, though where is ideal depends on the building and its
orientation.

and what are the reasons for
fitting it in one area as opposed to another ?

Some pointers:

1) don't have it in a room with supplementary heating (including a
kitchen)

2) don't have it in a room with excessive solar gains

3) have it somewhere you want heated all the time (avoid a little
used dining room)

A hall or north facing bedroom can be good places.


before TRVs I woudl have said that you put the thermostat at the
place where you want the temperature to be most constant - in the
living room for example.

But with TRVs doing the temperature control in each room why do people
have thermostats any more? If it's to turn the heating system on in
cold weather then perhaps it should actully be outside!

given the crude control systems on CH these days it wouldn't work very well.
It would tell the boiler to fire and circulate the water even though it was
warm inside but cool outside.
The best place to fit it is in the warmest area.
If it isn't in the warmest area the heating won't turn on even though the
area you want warm has cooled below the desired temp.

On Wed, 12 Nov 2008 18:30:59 -0000, "dennis@home"
wrote:



"RobertL" wrote in message
...
On Nov 12, 1:42 pm, David Hansen
wrote:
On Wed, 12 Nov 2008 13:24:45 +0000 someone who may be
wrote this:-

At present I have my CH Wireless Thermostat situated in the Hall . I
am about to replace the hall rad and am wondering if this is the best
place for the thermostat.
Is there an ideal place to fit it

Possibly, though where is ideal depends on the building and its
orientation.

and what are the reasons for
fitting it in one area as opposed to another ?

Some pointers:

1) don't have it in a room with supplementary heating (including a
kitchen)

2) don't have it in a room with excessive solar gains

3) have it somewhere you want heated all the time (avoid a little
used dining room)

A hall or north facing bedroom can be good places.


before TRVs I woudl have said that you put the thermostat at the
place where you want the temperature to be most constant - in the
living room for example.

But with TRVs doing the temperature control in each room why do people
have thermostats any more? If it's to turn the heating system on in
cold weather then perhaps it should actully be outside!

given the crude control systems on CH these days it wouldn't work very well.
It would tell the boiler to fire and circulate the water even though it was
warm inside but cool outside.
The best place to fit it is in the warmest area.
If it isn't in the warmest area the heating won't turn on even though the
area you want warm has cooled below the desired temp.

Eh ?????

On Wed, 12 Nov 2008 08:15:48 -0800 (PST) someone who may be RobertL
wrote this:-

1) don't have it in a room with supplementary heating (including a
kitchen)

2) don't have it in a room with excessive solar gains

3) have it somewhere you want heated all the time (avoid a little
used dining room)

A hall or north facing bedroom can be good places.


before TRVs I woudl have said that you put the thermostat at the
place where you want the temperature to be most constant - in the
living room for example.

Conflicts with my first point. If there is a coal/wood/gas/electric
fire then the rest of the house may well be cold while the living
room is at the right temperature.

But with TRVs doing the temperature control in each room why do people
have thermostats any more?

Imagine a heating system with all TRVs and just a time clock, the
pump could spend some considerable time pumping against a closed
head. Fit a bypass to the system and the boiler is likely to short
cycle when the house is near temperature. Add a thermostat in the
place which cools down most rapidly and these problems are solved.
There are more sophisticated ways of doing all this, but it adds
cost.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

Some pointers:

1) don't have it in a room with supplementary heating (including a
kitchen)

2) don't have it in a room with excessive solar gains

3) have it somewhere you want heated all the time (avoid a little
used dining room)

A hall or north facing bedroom can be good places.

That just about rules out anywhere in our house
Living room, dining area and kitchen and hall/landing are essentially open
plan. (no doors just arches)
No windows (except a toilet) face north. Double aspect lounge section has
large glass patio doors facing West and collecting a lot of sun after mid
day..
Still can't complain as we are probably in one of the warmest places in the
UK though sometimes fairly breezy.
Oh! and it's upside down..The four bedrooms are downstairs.
Michael in West Sussex

Don wrote :
But with TRVs doing the temperature control in each room why do people
have thermostats any more? If it's to turn the heating system on in
cold weather then perhaps it should actully be outside!

Robert

Possibly because a thermostat 'tells' the boiler when it needs to fire
up/down, a TRV closes the flow to the rad.

Perhaps a need for a flow through the boiler sensing to turn it off,
combined with a thermostat used to turn it back on?

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

dennis@home wrote:
"RobertL" wrote in message
...
On Nov 12, 1:42 pm, David Hansen
wrote:
On Wed, 12 Nov 2008 13:24:45 +0000 someone who may be
wrote this:-

At present I have my CH Wireless Thermostat situated in the Hall .
I am about to replace the hall rad and am wondering if this is the
best place for the thermostat.
Is there an ideal place to fit it

snipped some stuff

given the crude control systems on CH these days it wouldn't work
very well. It would tell the boiler to fire and circulate the water
even though it was warm inside but cool outside.
The best place to fit it is in the warmest area.
If it isn't in the warmest area the heating won't turn on even though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

In an effort to cut our gas bill I'm trying to get the family used to having
our programmer/room stat set at 20C instead of previous years where it's
been normal to have it at around 22-23C. The condensing combi boiler is up
in the loft and the guy who installed the system (which was already in when
we bought the house last year) installed the room stat in the living room.

A sort of an unintended side-effect of the desire to cut our bills is that
the living room seems to reach the required temperature of 20C quite easily
and the stat then shuts off the boiler, resulting in the rest of the house
being cold - or at least colder than son in his bedroom doing his homework,
daughter in her bedroom, and anyone wanting a shower, would like it to be.

That's the effect of fitting it in the warmest area - I'm moving our stat
into the hallway.

John

On Wed, 12 Nov 2008 20:05:11 -0000 someone who may be "Michael
Shergold" wrote this:-

That just about rules out anywhere in our house

Then you need a more complicated setup with individual controls for
parts of the house.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

"John" wrote in message
...

The best place to fit it is in the warmest area.
If it isn't in the warmest area the heating won't turn on even though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

If you put it in say the hall and set it to a sensible temp for a hall say
15C the the heating in the house will not come on if its 16C pretty cold for
a lounge or bathroom.


In an effort to cut our gas bill I'm trying to get the family used to
having
our programmer/room stat set at 20C instead of previous years where it's
been normal to have it at around 22-23C. The condensing combi boiler is up
in the loft and the guy who installed the system (which was already in
when
we bought the house last year) installed the room stat in the living room.

A sort of an unintended side-effect of the desire to cut our bills is that
the living room seems to reach the required temperature of 20C quite
easily
and the stat then shuts off the boiler, resulting in the rest of the house
being cold - or at least colder than son in his bedroom doing his
homework,
daughter in her bedroom, and anyone wanting a shower, would like it to be.


That's the effect of fitting it in the warmest area - I'm moving our stat
into the hallway.

That is caused by the system being unbalanced.
You need to adjust the output of the lounge rad downwards so it warms
slower.

Moving the stat or lowering the lounge output will increase your bills as
the rest of the house will be warmer, but that is what you want.

The message
from "John" contains these words:

If it isn't in the warmest area the heating won't turn on even though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

Does seem to be complete nonsense.

In an effort to cut our gas bill I'm trying to get the family used to having
our programmer/room stat set at 20C instead of previous years where it's
been normal to have it at around 22-23C. The condensing combi boiler is up
in the loft and the guy who installed the system (which was already in when
we bought the house last year) installed the room stat in the living room.

A sort of an unintended side-effect of the desire to cut our bills is that
the living room seems to reach the required temperature of 20C quite easily
and the stat then shuts off the boiler, resulting in the rest of the house
being cold - or at least colder than son in his bedroom doing his homework,
daughter in her bedroom, and anyone wanting a shower, would like it to be.

That's the effect of fitting it in the warmest area - I'm moving our stat
into the hallway.

But you are barking up the wrong tree as well. Your heating problem
stems from the room where the stat is heating up faster than the rest of
the house. It matters very little that that is the room you want to be
the warmest in the house ( but see below).

What you need to do is balance the heating system so every room warms up
in approximately the same time. It is likely that the warmest room is
also the room that will have the fastest temperature drop but if that is
not the case then the system needs to be set up so the rest of the house
actually warms up faster than the warmest room otherwise the rest of the
house will gradually drift colder as the thermostat governs the
temperature in the warmest room.

Putting the stat in the hall is the favourite trick of professional
installers as it is generally the easiest place and, as one installer
explained to me, it is conveniently placed to turn the heating down if
you go out. However the hall may be the worst possible place to put the
stat as the temperature drop in the hall is likely to be slower than
that in the living room so the boiler may often not be firing when the
living room actually needs heat except for the relatively rare times
when there is constant traffic in and out of the house.

--
Roger Chapman

"Roger" wrote in message
k...
The message
from "John" contains these words:

If it isn't in the warmest area the heating won't turn on even though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

Does seem to be complete nonsense.

Shame that its not.

If you put the stat in the coldest place the temperature has to drop below
the desired temp in the warmer areas before the heating will turn on. In
fact the lounge could sit at a lower temperature for weeks at a time without
the heating switching on if you put the stat in a cooler area.

In an effort to cut our gas bill I'm trying to get the family used to
having
our programmer/room stat set at 20C instead of previous years where it's
been normal to have it at around 22-23C. The condensing combi boiler is
up
in the loft and the guy who installed the system (which was already in
when
we bought the house last year) installed the room stat in the living
room.

A sort of an unintended side-effect of the desire to cut our bills is
that
the living room seems to reach the required temperature of 20C quite
easily
and the stat then shuts off the boiler, resulting in the rest of the
house
being cold - or at least colder than son in his bedroom doing his
homework,
daughter in her bedroom, and anyone wanting a shower, would like it to
be.

That's the effect of fitting it in the warmest area - I'm moving our stat
into the hallway.

But you are barking up the wrong tree as well. Your heating problem
stems from the room where the stat is heating up faster than the rest of
the house. It matters very little that that is the room you want to be
the warmest in the house ( but see below).

What you need to do is balance the heating system so every room warms up
in approximately the same time. It is likely that the warmest room is
also the room that will have the fastest temperature drop but if that is
not the case then the system needs to be set up so the rest of the house
actually warms up faster than the warmest room otherwise the rest of the
house will gradually drift colder as the thermostat governs the
temperature in the warmest room.

Putting the stat in the hall is the favourite trick of professional
installers as it is generally the easiest place and, as one installer
explained to me, it is conveniently placed to turn the heating down if
you go out. However the hall may be the worst possible place to put the
stat as the temperature drop in the hall is likely to be slower than
that in the living room so the boiler may often not be firing when the
living room actually needs heat except for the relatively rare times
when there is constant traffic in and out of the house.

The hall is a cr@p place unless you really want the hall to be as hot or
hotter than the lounge.

On Wed, 12 Nov 2008 22:39:52 -0000, "dennis@home"
wrote:



"Roger" wrote in message
. uk...
The message
from "John" contains these words:

If it isn't in the warmest area the heating won't turn on even though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

Does seem to be complete nonsense.

Shame that its not.

If you put the stat in the coldest place the temperature has to drop below
the desired temp in the warmer areas before the heating will turn on. In
fact the lounge could sit at a lower temperature for weeks at a time without
the heating switching on if you put the stat in a cooler area.


I'm trying to understand what you say above . Surely if the stat is
placed in the coldest place and the temp in that room drops below what
the stat is set at the heating will come on ,thereby heating the
lounge as well.

wrote in message
...
On Wed, 12 Nov 2008 22:39:52 -0000, "dennis@home"
wrote:



"Roger" wrote in message
.uk...
The message
from "John" contains these words:

If it isn't in the warmest area the heating won't turn on even though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

Does seem to be complete nonsense.

Shame that its not.

If you put the stat in the coldest place the temperature has to drop below
the desired temp in the warmer areas before the heating will turn on. In
fact the lounge could sit at a lower temperature for weeks at a time
without
the heating switching on if you put the stat in a cooler area.


I'm trying to understand what you say above . Surely if the stat is
placed in the coldest place and the temp in that room drops below what
the stat is set at the heating will come on ,thereby heating the
lounge as well.

Suppose you put it in a bedroom and set it to 15C.
The outside temp drops to 16C.
The house will drop to 16C.
The heating will not turn on, however long it sits at 16C.
Putting an ordinary room stat in the coldest place is a sure way to save
fuel as the heating doesn't come on as often, you will need thermal
underwear though.

If you want to be warm you need to have the stat turn the heating on when
the temperature drops below the warmest temperature you want, normally the
lounge or bathroom. So it needs to be set to the warmest temperature and its
no good putting it in a room where it never gets that warm as it will always
be on.

On Wed, 12 Nov 2008 23:53:44 -0000, "dennis@home"
wrote:



wrote in message
.. .
On Wed, 12 Nov 2008 22:39:52 -0000, "dennis@home"
wrote:



"Roger" wrote in message
o.uk...
The message
from "John" contains these words:

If it isn't in the warmest area the heating won't turn on even though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

Does seem to be complete nonsense.

Shame that its not.

If you put the stat in the coldest place the temperature has to drop below
the desired temp in the warmer areas before the heating will turn on. In
fact the lounge could sit at a lower temperature for weeks at a time
without
the heating switching on if you put the stat in a cooler area.


I'm trying to understand what you say above . Surely if the stat is
placed in the coldest place and the temp in that room drops below what
the stat is set at the heating will come on ,thereby heating the
lounge as well.

Suppose you put it in a bedroom and set it to 15C.
The outside temp drops to 16C.
The house will drop to 16C.
The heating will not turn on, however long it sits at 16C.
Putting an ordinary room stat in the coldest place is a sure way to save
fuel as the heating doesn't come on as often, you will need thermal
underwear though.

So you think if the outside Temp is 16C then the inside temp will also
be 16C ?

If you want to be warm you need to have the stat turn the heating on when
the temperature drops below the warmest temperature you want, normally the
lounge or bathroom. So it needs to be set to the warmest temperature and its
no good putting it in a room where it never gets that warm as it will always
be on.

You have just said " It will always be on"

wrote in message
...
On Wed, 12 Nov 2008 23:53:44 -0000, "dennis@home"
wrote:



wrote in message
. ..
On Wed, 12 Nov 2008 22:39:52 -0000, "dennis@home"
wrote:



"Roger" wrote in message
. co.uk...
The message
from "John" contains these words:

If it isn't in the warmest area the heating won't turn on even
though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

Does seem to be complete nonsense.

Shame that its not.

If you put the stat in the coldest place the temperature has to drop
below
the desired temp in the warmer areas before the heating will turn on. In
fact the lounge could sit at a lower temperature for weeks at a time
without
the heating switching on if you put the stat in a cooler area.


I'm trying to understand what you say above . Surely if the stat is
placed in the coldest place and the temp in that room drops below what
the stat is set at the heating will come on ,thereby heating the
lounge as well.

Suppose you put it in a bedroom and set it to 15C.
The outside temp drops to 16C.
The house will drop to 16C.
The heating will not turn on, however long it sits at 16C.
Putting an ordinary room stat in the coldest place is a sure way to save
fuel as the heating doesn't come on as often, you will need thermal
underwear though.

So you think if the outside Temp is 16C then the inside temp will also
be 16C ?

Why not? Do you really want to make it more complicated than it is, you
don't appear to understand the basics without adding in other heat sources.


If you want to be warm you need to have the stat turn the heating on when
the temperature drops below the warmest temperature you want, normally the
lounge or bathroom. So it needs to be set to the warmest temperature and
its
no good putting it in a room where it never gets that warm as it will
always
be on.

You have just said " It will always be on"

Well just think for a change.
If the stat is set to 20C and the TVR in the cooler room is set to 18C the
stat will always be on.

That's the trouble with CH most people don't understand anything about it.
Are you one of the people that think CH will heat up faster the higher you
set the thermostat?

On Thu, 13 Nov 2008 09:10:10 -0000 someone who may be "dennis@home"
wrote this:-

So you think if the outside Temp is 16C then the inside temp will also
be 16C ?

Why not?

Because most houses are not made out of a thin membrane, but rather
are made out of things like bricks.

Even if houses were made out of thin membranes the temperature would
only be the same inside and out in the absence of wind (assuming no
internal heat gains). When there is wind the temperature inside is
highly likely to be higher than the temperature outside [1].

Did you make a comment about understanding the basics?


[1] leaving aside the complex question of how one measures
temperatures. While the air temperature is relatively easy that
doesn't provide a particularly good measurement of conditions in the
room. For example in a building which is not made of a thin membrane
heat will at some times be radiating into the room from the walls.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

The message
from contains these words:

If it isn't in the warmest area the heating won't turn on even though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

Does seem to be complete nonsense.

Shame that its not.

If you put the stat in the coldest place the temperature has to drop below
the desired temp in the warmer areas before the heating will turn on. In
fact the lounge could sit at a lower temperature for weeks at a time
without
the heating switching on if you put the stat in a cooler area.

Dennis lives in my kill file for obvious reasons so I only see the
nonsense he spouts when it is re-posted.

I'm trying to understand what you say above . Surely if the stat is
placed in the coldest place and the temp in that room drops below what
the stat is set at the heating will come on ,thereby heating the
lounge as well.

Of course.

What you need to consider are the external factors effecting the heating
and where you want the temperature control to be most consistent.

Put the stat in the living room and that room at least will be
temperature controlled over close limits. Have the stat elsewhere and
TRVs on the rads in the living room and the limits are likely to be
somewhat larger and more variable even if heating system has been
balanced properly.

As I suggested before if you have the stat in the hall you get the worst
of both worlds - a closely controlled temperature in a place where such
precision doesn't really matter and a step change in boiler response
depending on whether or not the external door is opened.

Place the stat in a north facing bedroom (as suggested upthread as well)
and you do at least get a room where external influences are a minimum
but do you really want a bedroom to be at the same temperature all the
time the heating is on? Separate heating zones for upstairs and
downstairs are becoming commonplace these days which would rule that
option out for controlling downstairs heat in any event.

The major problem with a stat in the living room is the presence of a
supplementary heating source which could lead to the rest of the house
cooling down if it puts out a meaningful amount of heat but even that
can be worked round with a little bit of effort.

--
Roger Chapman

"Roger" wrote in message
k...
The message
from contains these words:

If it isn't in the warmest area the heating won't turn on even
though
the area you want warm has cooled below the desired temp.

snip

As I suggested before if you have the stat in the hall you get the worst
of both worlds - a closely controlled temperature in a place where such
precision doesn't really matter and a step change in boiler response
depending on whether or not the external door is opened.

Place the stat in a north facing bedroom (as suggested upthread as well)
and you do at least get a room where external influences are a minimum
but do you really want a bedroom to be at the same temperature all the
time the heating is on? Separate heating zones for upstairs and
downstairs are becoming commonplace these days which would rule that
option out for controlling downstairs heat in any event.

The major problem with a stat in the living room is the presence of a
supplementary heating source which could lead to the rest of the house
cooling down if it puts out a meaningful amount of heat but even that
can be worked round with a little bit of effort.

It's one of those conundrums that doesn't have an answer - well it does,
TRV's on all the radiators for starters and seprate zones. The main problem
with a thermostat, not in the hall but half way up the stairs, as I had one
once, was not the close control or the step change on front door opening
(which never happens as, in real life most of the other doors are open and
the cold air hits your feet) but having the hall in the north of the
building in winter and sun heating wintery south facing rooms which then got
too hot as the heating was on. The sitting room has problems as have been
described.

In the light of experience, I would put the thermostat in the dining room if
you have one. It is less likely to have separate heat sources or an outside
door and is still a living room and reasonable furnished and curtained
(usually) and only slightly cooler than the sitting room. It's not ideal but
best you can do IMHO


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not

"David Hansen" wrote in message
...
On Thu, 13 Nov 2008 09:10:10 -0000 someone who may be "dennis@home"
wrote this:-

So you think if the outside Temp is 16C then the inside temp will also
be 16C ?

Why not?

Because most houses are not made out of a thin membrane, but rather
are made out of things like bricks.

Even if houses were made out of thin membranes the temperature would
only be the same inside and out in the absence of wind (assuming no
internal heat gains). When there is wind the temperature inside is
highly likely to be higher than the temperature outside [1].

Untrue.
The wind does not effect the temperature only the rate of heat loss.


Did you make a comment about understanding the basics?

Don't start that one when you clearly think the wind effects the temperature
when it doesn't.

[1] leaving aside the complex question of how one measures
temperatures. While the air temperature is relatively easy that
doesn't provide a particularly good measurement of conditions in the
room. For example in a building which is not made of a thin membrane
heat will at some times be radiating into the room from the walls.

Which makes no difference to what I said.
Leave it long enough and it will reach outside temp and the heating still
hasn't switched on.

On Thu, 13 Nov 2008 10:13:54 -0000 someone who may be "dennis@home"
wrote this:-

Even if houses were made out of thin membranes the temperature would
only be the same inside and out in the absence of wind (assuming no
internal heat gains). When there is wind the temperature inside is
highly likely to be higher than the temperature outside [1].

Untrue.
The wind does not effect the temperature only the rate of heat loss.

A fascinating assertion. If one accepts it, for the sake of
argument, then the rate of heat loss must not affect the
temperature. As I said, fascinating.

You may have the last word.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

On Thu, 13 Nov 2008 09:10:10 -0000, "dennis@home"
wrote:



wrote in message
.. .
On Wed, 12 Nov 2008 23:53:44 -0000, "dennis@home"
wrote:



wrote in message
...
On Wed, 12 Nov 2008 22:39:52 -0000, "dennis@home"
wrote:



"Roger" wrote in message
.co.uk...
The message
from "John" contains these words:

If it isn't in the warmest area the heating won't turn on even
though
the area you want warm has cooled below the desired temp.

What on earth are you on about?

Does seem to be complete nonsense.

Shame that its not.

If you put the stat in the coldest place the temperature has to drop
below
the desired temp in the warmer areas before the heating will turn on. In
fact the lounge could sit at a lower temperature for weeks at a time
without
the heating switching on if you put the stat in a cooler area.


I'm trying to understand what you say above . Surely if the stat is
placed in the coldest place and the temp in that room drops below what
the stat is set at the heating will come on ,thereby heating the
lounge as well.

Suppose you put it in a bedroom and set it to 15C.
The outside temp drops to 16C.
The house will drop to 16C.
The heating will not turn on, however long it sits at 16C.
Putting an ordinary room stat in the coldest place is a sure way to save
fuel as the heating doesn't come on as often, you will need thermal
underwear though.

So you think if the outside Temp is 16C then the inside temp will also
be 16C ?

Why not? Do you really want to make it more complicated than it is, you
don't appear to understand the basics without adding in other heat sources.


If you want to be warm you need to have the stat turn the heating on when
the temperature drops below the warmest temperature you want, normally the
lounge or bathroom. So it needs to be set to the warmest temperature and
its
no good putting it in a room where it never gets that warm as it will
always
be on.

You have just said " It will always be on"

Well just think for a change.
If the stat is set to 20C and the TVR in the cooler room is set to 18C the
stat will always be on.

Are you suggesting that the stat and the TVR will be in the same
room .AIUI the rads in the room with the stat should not have a TVR .


That's the trouble with CH most people don't understand anything about it.
Are you one of the people that think CH will heat up faster the higher you
set the thermostat?

Err no!

"David Hansen" wrote in message
...
On Thu, 13 Nov 2008 10:13:54 -0000 someone who may be "dennis@home"
wrote this:-

Even if houses were made out of thin membranes the temperature would
only be the same inside and out in the absence of wind (assuming no
internal heat gains). When there is wind the temperature inside is
highly likely to be higher than the temperature outside [1].

Untrue.
The wind does not effect the temperature only the rate of heat loss.

A fascinating assertion. If one accepts it, for the sake of
argument, then the rate of heat loss must not affect the
temperature. As I said, fascinating.

Correct, the rate of heat loss does *not* have any effect on when the stat
switches.

You may have the last word.

Good, then I don't have to explain why you are wrong.

wrote in message
...


If the stat is set to 20C and the TVR in the cooler room is set to 18C the
stat will always be on.

Are you suggesting that the stat and the TVR will be in the same
room .AIUI the rads in the room with the stat should not have a TVR .

No, I haven't said where the TRVs are.
I have said what will happen if someone puts the stat in a room where the
TRV is set lower.
And we are talking about someone moving the stat.

If you want to do the job properly then fit stats in each room and fit zones
valves.
TRVs and a room stat are a cheap bodge.