Anyone got any experience and opinion on Viessmann boilers with or
without weather compensation?

We've currently got a seven year old Worcester Bosch boiler (not combi)
and the heat exchanger seems to be starting to shed a grey (aluminium?)
powder into the condensate stream. It's also locking out increasingly
regularly due, we think, to overheating. There's some kettling to be
heard...

Options when it finally fails are either replace the heat exchanger, or
replace the boiler with one that doesn't eat its heat exchanger.
Viessmann had been suggested as it's all stainless steel. Weather
compensation would be nice, though not if it's £silly.

--
F

In article ,
F news@nowhere wrote:
Anyone got any experience and opinion on Viessmann boilers with or
without weather compensation?

We've currently got a seven year old Worcester Bosch boiler (not combi)
and the heat exchanger seems to be starting to shed a grey (aluminium?)
powder into the condensate stream. It's also locking out increasingly
regularly due, we think, to overheating. There's some kettling to be
heard...

Options when it finally fails are either replace the heat exchanger, or
replace the boiler with one that doesn't eat its heat exchanger.
Viessmann had been suggested as it's all stainless steel. Weather
compensation would be nice, though not if it's £silly.

I've got a Vitodens WB2 system boiler with storage hot water. Weather
compensation. Been pretty reliable - but setting the software for it is a
nightmare, even with the service manuals. It is several years old so
modern ones may be better.

It certainly seems to be well built and hopefully will return the higher
initial cost. I installed it myself, and their helpline was pretty good.
But if getting one installed make sure you find someone who knows them
well.

--
*No hand signals. Driver on Viagra*

Dave Plowman London SW
To e-mail, change noise into sound.

Anyone got any experience and opinion on Viessmann boilers with or
without weather compensation?


No personal experience but I see they are rated third best after Worcester
and Vaillant in the latest Which report.

Mike

On 20/09/2013 14:19 Muddymike wrote:

Anyone got any experience and opinion on Viessmann boilers with or
without weather compensation?


No personal experience but I see they are rated third best after
Worcester and Vaillant in the latest Which report.

That's interesting.

I wonder what Which do to take aging into account? The plumbers I've
been talking to have said that the WB is/was an excellent boiler and
they have fitted them for years but, now the boilers are aging and they
are servicing them regularly, they are starting to notice the aluminium
depoits from the interior of the heat exchanger and are needing to
replace the exchangers. The heat exchanger on ours has a rippled
exterior and you can hear it kettling.

WB, apparently, deny there's a problem.

--
F

In article ,
F news@nowhere wrote:
On 20/09/2013 14:19 Muddymike wrote:

Anyone got any experience and opinion on Viessmann boilers with or
without weather compensation?


No personal experience but I see they are rated third best after
Worcester and Vaillant in the latest Which report.

That's interesting.

I wonder what Which do to take aging into account? The plumbers I've
been talking to have said that the WB is/was an excellent boiler and
they have fitted them for years but, now the boilers are aging and they
are servicing them regularly, they are starting to notice the aluminium
depoits from the interior of the heat exchanger and are needing to
replace the exchangers. The heat exchanger on ours has a rippled
exterior and you can hear it kettling.

WB, apparently, deny there's a problem.


I'd be surprised if Which had enough data on early Viessmann boilers to
come to an accurate conclusion about life.

--
*A conscience is what hurts when all your other parts feel so good *

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
F news@nowhere wrote:
On 20/09/2013 14:19 Muddymike wrote:

Anyone got any experience and opinion on Viessmann boilers with or
without weather compensation?


No personal experience but I see they are rated third best after
Worcester and Vaillant in the latest Which report.

That's interesting.

I wonder what Which do to take aging into account? The plumbers I've
been talking to have said that the WB is/was an excellent boiler and
they have fitted them for years but, now the boilers are aging and they
are servicing them regularly, they are starting to notice the aluminium
depoits from the interior of the heat exchanger and are needing to
replace the exchangers. The heat exchanger on ours has a rippled
exterior and you can hear it kettling.

WB, apparently, deny there's a problem.


I'd be surprised if Which had enough data on early Viessmann boilers to
come to an accurate conclusion about life.

They claim the reports are based on sample size;

84% Worcester 1,911
83% Vaillant 903
80% Viessmann 103
76% Remeha 39
69% Glow Worm 446
This is the Top 5 by % satisfaction

Mike

On 09/20/2013 04:03 PM, Muddymike wrote:

They claim the reports are based on sample size;

84% Worcester 1,911
83% Vaillant 903
80% Viessmann 103
76% Remeha 39
69% Glow Worm 446
This is the Top 5 by % satisfaction

Mike

What concerns me is that increasingly people seen to feel 7 10 year
life is acceptable for a boiler costing £2000 £3000 + servicing and
faults ! If you then add in the lost useful heat of an old boiler the
savings are really exaggerated but of course there's now no choice.

Andy C

Muddymike wrote:
In article ,
F news@nowhere wrote:
On 20/09/2013 14:19 Muddymike wrote:

Anyone got any experience and opinion on Viessmann boilers with or
without weather compensation?


No personal experience but I see they are rated third best after
Worcester and Vaillant in the latest Which report.

That's interesting.

I wonder what Which do to take aging into account? The plumbers I've
been talking to have said that the WB is/was an excellent boiler and
they have fitted them for years but, now the boilers are aging and
they are servicing them regularly, they are starting to notice the
aluminium depoits from the interior of the heat exchanger and are
needing to replace the exchangers. The heat exchanger on ours has a
rippled exterior and you can hear it kettling.

WB, apparently, deny there's a problem.


I'd be surprised if Which had enough data on early Viessmann boilers
to come to an accurate conclusion about life.

They claim the reports are based on sample size;

84% Worcester 1,911
83% Vaillant 903
80% Viessmann 103
76% Remeha 39
69% Glow Worm 446
This is the Top 5 by % satisfaction

Mike

Who's satisfaction?

--
Adam

On 20/09/2013 14:19, Muddymike wrote:
Anyone got any experience and opinion on Viessmann boilers with or
without weather compensation?


No personal experience but I see they are rated third best after
Worcester and Vaillant in the latest Which report.

Mike

pdf of article at:
http://www.staticwhich.co.uk/documen...ers-334002.pdf

On 25/09/2013 11:00 Allan wrote:

pdf of article at:
http://www.staticwhich.co.uk/documen...ers-334002.pdf

Thanks: appreciated!

--
F

F wrote:
On 25/09/2013 11:00 Allan wrote:

pdf of article at:
http://www.staticwhich.co.uk/documen...ers-334002.pdf

Thanks: appreciated!

+1

--
Adam

On 20/09/2013 11:23 F wrote:

Weathercompensation would be nice, though not if it's £silly.

I'm (not for the first time!) confused.

Reading through the Viessmann weather compensation literature it
explains that the boiler will set a lower flow temperature if the
weather is warm, and a higher one in cold weather 'to adjust the
radiator output, to maintain a constant temperature indoors'.

If the boiler is messing with radiator temperatures 'to maintain a
constant temperature', how would my current programmable room thermostat
be set?

--
F

In article ,
F news@nowhere wrote:
On 20/09/2013 11:23 F wrote:

Weathercompensation would be nice, though not if it's £silly.

I'm (not for the first time!) confused.

Reading through the Viessmann weather compensation literature it
explains that the boiler will set a lower flow temperature if the
weather is warm, and a higher one in cold weather 'to adjust the
radiator output, to maintain a constant temperature indoors'.

If the boiler is messing with radiator temperatures 'to maintain a
constant temperature', how would my current programmable room thermostat
be set?

You don't have a room thermostat - programmable or otherwise. You set the
software in the boiler to give the required temperature.

--
*What do little birdies see when they get knocked unconscious? *

Dave Plowman London SW
To e-mail, change noise into sound.

F wrote:

If the boiler is messing with radiator temperatures 'to maintain a
constant temperature', how would my current programmable room thermostat
be set?

As you like it. When it's colder outside the boiler will send hotter
water to help reach the programmer's set temperatute quicker.

On 24/09/2013 22:14 F wrote:

If the boiler is messing with radiator temperatures 'to maintain a
constant temperature', how would my current programmable room thermostat
be set?

There would appear to be a conflict in advice...

'You don't have a room thermostat - programmable or otherwise. You set
the software in the boiler to give the required temperature.'

'As you like it. When it's colder outside the boiler will send hotter
water to help reach the programmer's set temperatute quicker.'

--
F

In article ,
F news@nowhere wrote:
If the boiler is messing with radiator temperatures 'to maintain a
constant temperature', how would my current programmable room thermostat
be set?

There would appear to be a conflict in advice...

Not from me. ;-)

'You don't have a room thermostat - programmable or otherwise. You set
the software in the boiler to give the required temperature.'

That is exactly how my weather compensation works.

'As you like it. When it's colder outside the boiler will send hotter
water to help reach the programmer's set temperatute quicker.'

Programmer as in boiler programmer - rather than room stat one?

--
*Acupuncture is a jab well done*

Dave Plowman London SW
To e-mail, change noise into sound.

Dave Plowman (News) wrote:

F news@nowhere wrote:

'You don't have a room thermostat - programmable or otherwise. You set
the software in the boiler to give the required temperature.'

That is exactly how my weather compensation works.

So no room stat at all? OK the boiler can probably sense the flow and
return temperatures but how is it to know what effect that temperature
difference is having?

In article ,
Andy Burns wrote:
Dave Plowman (News) wrote:

F news@nowhere wrote:

'You don't have a room thermostat - programmable or otherwise. You set
the software in the boiler to give the required temperature.'

That is exactly how my weather compensation works.

So no room stat at all? OK the boiler can probably sense the flow and
return temperatures but how is it to know what effect that temperature
difference is having?

The software works it out. All the parameters needed are there. You set
things so the house is at the temperature you want. After that, the
outside temp is all that's needed by way of a sensor. If you wish to have
different temperatures throughout the day, you do it by zoning.

It's rather similar to the old way of balancing rads to give the
temperature required in each room - rather than using TRVs. Which worked
very well if properly designed and adjusted.

--
*All those who believe in psychokinesis, raise my hand *

Dave Plowman London SW
To e-mail, change noise into sound.