Hi

I have a Bosch Greenstar 28i Condensing boiler and live in a large 3bed
semi..

I have 9 rads all (but one) with TRV's. I also have a Bosch Wirless
Room Thermostat DT20RF

We have large ceilings (its an old victorian house) and the house does
take a while to heat up!. Can anyone advise what is the best method of
heating? IE

Do I turn the boiler to full (I mean the MAX setting, as the dial has
1-6 then a MAX setting) and then set the Room thermostat to 21/22 ?? -
and then leave all the RAD TRV's on the '4' setting (one of maximum) or
all completely open - this will mean the RADS are nearly all constantly
running (with exception maybe of kitchen etc)

Or is it best to control the heat from the room thermostat AND the
TRV's....ie set rads to about number '3' which means they turn off at
around 19'ish degrees...

At the moment I have the boiler set to '6' and the rads between 3-4
which is taking around 4 hours to go from a 'cold' 15-16 upto 21-22
when it fires up at 4:30pm....by around 8:30, the Room thermostat is
turning the boiler off...

Is there a reason you wouldnt use the MAX setting on the CH on the
Greenstar??

wrote in message
ups.com...
Hi

I have a Bosch Greenstar 28i Condensing boiler and live in a large 3bed
semi..

I have 9 rads all (but one) with TRV's. I also have a Bosch Wirless
Room Thermostat DT20RF

We have large ceilings (its an old victorian house) and the house does
take a while to heat up!. Can anyone advise what is the best method of
heating? IE

Do I turn the boiler to full (I mean the MAX setting, as the dial has
1-6 then a MAX setting) and then set the Room thermostat to 21/22 ?? -
and then leave all the RAD TRV's on the '4' setting (one of maximum) or
all completely open - this will mean the RADS are nearly all constantly
running (with exception maybe of kitchen etc)

Or is it best to control the heat from the room thermostat AND the
TRV's....ie set rads to about number '3' which means they turn off at
around 19'ish degrees...

At the moment I have the boiler set to '6' and the rads between 3-4
which is taking around 4 hours to go from a 'cold' 15-16 upto 21-22
when it fires up at 4:30pm....by around 8:30, the Room thermostat is
turning the boiler off...

Is there a reason you wouldnt use the MAX setting on the CH on the
Greenstar??


The room thermostat should be in a room where the radiator(s) have no TRV.
That way you won't have the thermostat and the TRV in the same room trying
to fight each other.

All other rooms have TRV's set to whatever temperature you want ( about II
is what I set them to ).

As a refinement, make sure that the room in which you have the thermostat
( often the hallway, but can be the living room if there is no secondary
heat source like a fire in the living room ) gets to temperature a little
behind the other rooms, so the TRV's in all other rooms have achieved their
intended room temperature and are regulating it before the thermostat turns
the boiler off.
This can be done by throttling the radiator in the room containing the
thermostat, using its lock shield valve if necessary.

Andy.

Thanks for that.

The thermostat is in the room with the RAD with the TRV fully open -
and as its the largest room, it does take longest to get warm..so thats
OK!

Should the boiler be at its number '6' setting....or MAX..whatever the
difference is??
Andy wrote:
wrote in message
ups.com...
Hi

I have a Bosch Greenstar 28i Condensing boiler and live in a large 3bed
semi..

I have 9 rads all (but one) with TRV's. I also have a Bosch Wirless
Room Thermostat DT20RF

We have large ceilings (its an old victorian house) and the house does
take a while to heat up!. Can anyone advise what is the best method of
heating? IE

Do I turn the boiler to full (I mean the MAX setting, as the dial has
1-6 then a MAX setting) and then set the Room thermostat to 21/22 ?? -
and then leave all the RAD TRV's on the '4' setting (one of maximum) or
all completely open - this will mean the RADS are nearly all constantly
running (with exception maybe of kitchen etc)

Or is it best to control the heat from the room thermostat AND the
TRV's....ie set rads to about number '3' which means they turn off at
around 19'ish degrees...

At the moment I have the boiler set to '6' and the rads between 3-4
which is taking around 4 hours to go from a 'cold' 15-16 upto 21-22
when it fires up at 4:30pm....by around 8:30, the Room thermostat is
turning the boiler off...

Is there a reason you wouldnt use the MAX setting on the CH on the
Greenstar??


The room thermostat should be in a room where the radiator(s) have no TRV.
That way you won't have the thermostat and the TRV in the same room trying
to fight each other.

All other rooms have TRV's set to whatever temperature you want ( about II
is what I set them to ).

As a refinement, make sure that the room in which you have the thermostat
( often the hallway, but can be the living room if there is no secondary
heat source like a fire in the living room ) gets to temperature a little
behind the other rooms, so the TRV's in all other rooms have achieved their
intended room temperature and are regulating it before the thermostat turns
the boiler off.
This can be done by throttling the radiator in the room containing the
thermostat, using its lock shield valve if necessary.

Andy.

wrote in message
oups.com...
Thanks for that.

The thermostat is in the room with the RAD with the TRV fully open -
and as its the largest room, it does take longest to get warm..so thats
OK!

Should the boiler be at its number '6' setting....or MAX..whatever the
difference is??

There's a recent thread called "TRV temp control or boiler temp control?"
which might be helpful.

wrote in message
oups.com...
Thanks for that.

The thermostat is in the room with the RAD with the TRV fully open -
and as its the largest room, it does take longest to get warm..so thats
OK!

Should the boiler be at its number '6' setting....or MAX..whatever the
difference is??

A fully open TRV is good in a thermostatted room. Whether it takes that room
longest to heat up depends on how they've sized the radiators, but you sound
as if you've got everything OK.

Opinions differ on CH temperature, it may depend a bit on whether you have a
condenser or not*.
Most people seem to think that hot is best, so that's no 6. I think that'll
correspond to 82 to 89 C or thereabouts. I can't remember the reasoning: it
may be something to do with the boiler being designed for operation at that
temp, or the shorter boiler 'on' times ( and hence pump runs etc ) needed
for hotter CH boiler setting.

You'll need to turn the temp up higher in cold weather anyway otherwise you
won't get enough heat from your rads.

*There was a thread a week or two ago on this very subject. Google groups
will have cached it even if its gone from your newsserver.

Andy.
Andy wrote:
wrote in message
ups.com...
Hi

I have a Bosch Greenstar 28i Condensing boiler and live in a large 3bed
semi..

I have 9 rads all (but one) with TRV's. I also have a Bosch Wirless
Room Thermostat DT20RF

We have large ceilings (its an old victorian house) and the house does
take a while to heat up!. Can anyone advise what is the best method of
heating? IE

Do I turn the boiler to full (I mean the MAX setting, as the dial has
1-6 then a MAX setting) and then set the Room thermostat to 21/22 ?? -
and then leave all the RAD TRV's on the '4' setting (one of maximum) or
all completely open - this will mean the RADS are nearly all constantly
running (with exception maybe of kitchen etc)

Or is it best to control the heat from the room thermostat AND the
TRV's....ie set rads to about number '3' which means they turn off at
around 19'ish degrees...

At the moment I have the boiler set to '6' and the rads between 3-4
which is taking around 4 hours to go from a 'cold' 15-16 upto 21-22
when it fires up at 4:30pm....by around 8:30, the Room thermostat is
turning the boiler off...

Is there a reason you wouldnt use the MAX setting on the CH on the
Greenstar??


The room thermostat should be in a room where the radiator(s) have no
TRV.
That way you won't have the thermostat and the TRV in the same room
trying
to fight each other.

All other rooms have TRV's set to whatever temperature you want ( about
II
is what I set them to ).

As a refinement, make sure that the room in which you have the thermostat
( often the hallway, but can be the living room if there is no secondary
heat source like a fire in the living room ) gets to temperature a little
behind the other rooms, so the TRV's in all other rooms have achieved
their
intended room temperature and are regulating it before the thermostat
turns
the boiler off.
This can be done by throttling the radiator in the room containing the
thermostat, using its lock shield valve if necessary.

Andy.