On my boiler, the domestic hot water has got cooler lately, although
the thermostat is turned up. I think the DHW heat exchanger needs
replacing, it has been done some years ago. I assume, these become
furred-up from hard water. Is it possible to soak them in large
volumes of kettle de-scaler and then re-use them? I never thought of
this before. any advice appreciated thankyou.

Circulating a solution of Fernox DS3 through the fresh water side should
do it.


--
Cheers,

John.

Suggested technique? (Or do you mean, after removing the HX?)

In message
,
4square writes
On 3 June, 01:06, John Rumm wrote:
On 02/06/2010 22:35, newshound wrote:



Circulating a solution of Fernox DS3 through the fresh water side
should do it.

--
Cheers,

John.

Suggested technique? (Or do you mean, after removing the HX?)

Yup, sorry should have made that clear. Remove the HX, and arrange some
way of pouring/pumping the descaler through it.


Now have quote from plumber of £130 (inc VAT) for new HX, plus
fitting. I was a bit startled at the cost, but not much I can do
really. Will keep the old HX, try to de-scale it.
Plumber also mentioned could be fault in PCB, and these are £200 it
seems.
He suggested, if it is the PCB, following fitting of new HX, to
replace the boiler.
This combi is only 11 years old, are they all prone to faults?
My original vented system gas CF boiler was in use for about 25 years,
until it leaked.
Seems these new boilers are good for plumbers profits!


A plumber who can'r differentiate between a heat exchanger and a pcb
fault shouldn't be let anywhere near a boiler

11 years old ?

The expected lifetime of a modern boiler is 7 years (i.e just long
enough to be "fit for purpose")


--
geoff

On 5 June, 14:17, geoff wrote:
In message
,
4square writes





On 3 June, 01:06, John Rumm wrote:
On 02/06/2010 22:35, newshound wrote:

Circulating a solution of Fernox DS3 through the fresh water side
should do it.

--
Cheers,

John.

Suggested technique? (Or do you mean, after removing the HX?)

Yup, sorry should have made that clear. Remove the HX, and arrange some
way of pouring/pumping the descaler through it.

Now have quote from plumber of £130 (inc VAT) for new HX, plus
fitting. I was a bit startled at the cost, but not much I can do
really. *Will keep the old HX, try to de-scale it.
Plumber also mentioned could be fault in PCB, and these are £200 it
seems.
He suggested, if it is the PCB, following fitting of new HX, to
replace the boiler.
This combi is only 11 years old, are they all prone to faults?
My original vented system gas CF boiler was in use for about 25 years,
until it leaked.
Seems these new boilers are good for plumbers profits!

A plumber who can'r differentiate between a heat exchanger and a pcb
fault shouldn't be let anywhere near a boiler

11 years old ?

The expected lifetime of a modern boiler is 7 years (i.e just long
enough to be "fit for purpose")

--
geoff- Hide quoted text -

- Show quoted text -

7 years boiler life - is this generally recognised as being
satisfactory? Why so short, when I have an 18-year-old car, a 20yr-
old fridge/freeezer, 25yr-old electric oven / gas hob, all subject
to daily use, with no serious faults. Also, a new wall-hung boiler
means yet more holes in load-bearing walls, for mountings and
vents, and draining of CH system, all extra labour costs. It could
be concluded, that these combi's are not designed and built correctly
in the first place.

In article
..com, 4square writes

7 years boiler life - is this generally recognised as being
satisfactory? Why so short, when I have an 18-year-old car, a 20yr-
old fridge/freeezer, 25yr-old electric oven / gas hob, all subject
to daily use, with no serious faults. Also, a new wall-hung boiler
means yet more holes in load-bearing walls, for mountings and
vents, and draining of CH system, all extra labour costs. It could
be concluded, that these combi's are not designed and built correctly
in the first place.

In my (albeit limited) experience, combis are a waste of time unless you
have an electric shower and have one rated about 3 times what they say
on the tin!

--
John Alexander,

Remove NOSPAM if replying by e-mail

In message
,
4square writes
On 5 June, 14:17, geoff wrote:
In message
,
4square writes





On 3 June, 01:06, John Rumm wrote:
On 02/06/2010 22:35, newshound wrote:

Circulating a solution of Fernox DS3 through the fresh water side
should do it.

--
Cheers,

John.

Suggested technique? (Or do you mean, after removing the HX?)

Yup, sorry should have made that clear. Remove the HX, and arrange some
way of pouring/pumping the descaler through it.

Now have quote from plumber of £130 (inc VAT) for new HX, plus
fitting. I was a bit startled at the cost, but not much I can do
really. *Will keep the old HX, try to de-scale it.
Plumber also mentioned could be fault in PCB, and these are £200 it
seems.
He suggested, if it is the PCB, following fitting of new HX, to
replace the boiler.
This combi is only 11 years old, are they all prone to faults?
My original vented system gas CF boiler was in use for about 25 years,
until it leaked.
Seems these new boilers are good for plumbers profits!

A plumber who can'r differentiate between a heat exchanger and a pcb
fault shouldn't be let anywhere near a boiler

11 years old ?

The expected lifetime of a modern boiler is 7 years (i.e just long
enough to be "fit for purpose")

--
geoff- Hide quoted text -

- Show quoted text -

7 years boiler life - is this generally recognised as being
satisfactory? Why so short, when I have an 18-year-old car, a 20yr-
old fridge/freeezer, 25yr-old electric oven / gas hob, all subject
to daily use, with no serious faults. Also, a new wall-hung boiler
means yet more holes in load-bearing walls, for mountings and
vents, and draining of CH system, all extra labour costs. It could
be concluded, that these combi's are not designed and built correctly
in the first place.

No, I think you are missing the bleeding obvious there


--
geoff

In message , John
writes
In article
.com, 4square writes

7 years boiler life - is this generally recognised as being
satisfactory? Why so short, when I have an 18-year-old car, a 20yr-
old fridge/freeezer, 25yr-old electric oven / gas hob, all subject
to daily use, with no serious faults. Also, a new wall-hung boiler
means yet more holes in load-bearing walls, for mountings and
vents, and draining of CH system, all extra labour costs. It could
be concluded, that these combi's are not designed and built correctly
in the first place.

In my (albeit limited) experience, combis are a waste of time unless you
have an electric shower and have one rated about 3 times what they say
on the tin!

It has less to do with it being a combi than just a modern boiler


--
geoff

"John" wrote in message
...
In article
.com, 4square writes

7 years boiler life - is this generally recognised as being
satisfactory? Why so short, when I have an 18-year-old car, a 20yr-
old fridge/freeezer, 25yr-old electric oven / gas hob, all subject
to daily use, with no serious faults. Also, a new wall-hung boiler
means yet more holes in load-bearing walls, for mountings and
vents, and draining of CH system, all extra labour costs. It could
be concluded, that these combi's are not designed and built correctly
in the first place.

In my (albeit limited) experience, combis are a waste of time unless you
have an electric shower and have one rated about 3 times what they say
on the tin!

You said it, "limited". Buy yourself a proper, quality, correctly sized
combi and install an in-line instant electic heater for the shower as
backup, which can also do a tap as well.

Look at an ATAG 51kW, W-Bosch HighFlow 550, Broag 39C.

"geoff" wrote in message
...
In message
,
4square writes
On 3 June, 01:06, John Rumm wrote:
On 02/06/2010 22:35, newshound wrote:



Circulating a solution of Fernox DS3 through the fresh water side
should do it.

--
Cheers,

John.

Suggested technique? (Or do you mean, after removing the HX?)

Yup, sorry should have made that clear. Remove the HX, and arrange some
way of pouring/pumping the descaler through it.


Now have quote from plumber of £130 (inc VAT) for new HX, plus
fitting. I was a bit startled at the cost, but not much I can do
really. Will keep the old HX, try to de-scale it.
Plumber also mentioned could be fault in PCB, and these are £200 it
seems.
He suggested, if it is the PCB, following fitting of new HX, to
replace the boiler.
This combi is only 11 years old, are they all prone to faults?
My original vented system gas CF boiler was in use for about 25 years,
until it leaked.
Seems these new boilers are good for plumbers profits!


A plumber who can'r differentiate between a heat exchanger and a pcb fault
shouldn't be let anywhere near a boiler

11 years old ?

The expected lifetime of a modern boiler is 7 years (i.e just long enough
to be "fit for purpose")

Maxie, can you point to some figures about this 7 years, or did you just
make that up?

"4square" wrote in message
...

7 years boiler life - is this generally recognised as being
satisfactory?


A quality combi from an established maker will last 20 years, if installed
properly, have a Magna Boost filter on the return and a "clean" system.
Redose with X-400 every 4 years - no need to drain, just drain off enough to
get a 1 litre can poured in.

Having a scale reducer on the hot water inlet will make the DHW plate heat X
last longer.

Also having one with an outside weather compensator will prolong longevity
as the burner will be at a reduced level for most of the time when heat the
CH - also it saves a lot of money in gas bills.

In message , Doctor Drivel
writes

"geoff" wrote in message
...

Now have quote from plumber of £130 (inc VAT) for new HX, plus
fitting. I was a bit startled at the cost, but not much I can do
really. Will keep the old HX, try to de-scale it.
Plumber also mentioned could be fault in PCB, and these are £200 it
seems.
He suggested, if it is the PCB, following fitting of new HX, to
replace the boiler.
This combi is only 11 years old, are they all prone to faults?
My original vented system gas CF boiler was in use for about 25 years,
until it leaked.
Seems these new boilers are good for plumbers profits!


A plumber who can'r differentiate between a heat exchanger and a pcb
fault shouldn't be let anywhere near a boiler

11 years old ?

The expected lifetime of a modern boiler is 7 years (i.e just long
enough to be "fit for purpose")

Maxie, can you point to some figures about this 7 years, or did you
just make that up?


I have seen the figure quoted in several trade mags

Prolly not in the manufacturers brochures you use (for some reason)

--
geoff

geoff wrote:

Maxie, can you point to some figures about this 7 years, or did you
just make that up?


I have seen the figure quoted in several trade mags

Prolly not in the manufacturers brochures you use (for some reason)

Drivel is blowing it out of his bottom, again.

"Modern condensing boilers, by contrast, have lightweight aluminium
alloy heat exchangers and are heavily dependent on electronic control
systems, which have a limited life. It was recently reported in an
engineering journal that modern condensing boilers have a life
expectancy of five years. Whereas your existing boiler - given a
reasonable degree of care and maintenance - might last another 25
years."

http://www.telegraph.co.uk/property/...g-boilers.html

"geoff" wrote in message
news
In message , Doctor Drivel
writes

"geoff" wrote in message
...

Now have quote from plumber of £130 (inc VAT) for new HX, plus
fitting. I was a bit startled at the cost, but not much I can do
really. Will keep the old HX, try to de-scale it.
Plumber also mentioned could be fault in PCB, and these are £200 it
seems.
He suggested, if it is the PCB, following fitting of new HX, to
replace the boiler.
This combi is only 11 years old, are they all prone to faults?
My original vented system gas CF boiler was in use for about 25 years,
until it leaked.
Seems these new boilers are good for plumbers profits!


A plumber who can'r differentiate between a heat exchanger and a pcb
fault shouldn't be let anywhere near a boiler

11 years old ?

The expected lifetime of a modern boiler is 7 years (i.e just long
enough to be "fit for purpose")

Maxie, can you point to some figures about this 7 years, or did you just
make that up?

I have seen the figure quoted in several trade mags

Who published them? Maxie, it is lies and more lies.

Prolly not in the manufacturers brochures you use (for some reason)

Maxie, I doubt if it is in the makers brochures.

"Steve Firth" wrote in message
.. .
geoff wrote:

Maxie, can you point to some figures about this 7 years, or did you
just make that up?


I have seen the figure quoted in several trade mags

Prolly not in the manufacturers brochures you use (for some reason)

Drivel

This pervo needs locking up. Tagging is too good for him.

http://www.telegraph.co.uk/property/...ilers.htmlJeff Howells is an idiot and laughed at in the heating business for histotal absence of knowledge. He never mentioned that a Keston could be fluedup the chimney using cheap plastic drain pipe - because he didn't know.

Doctor Drivel wrote:

"Steve Firth" wrote in message
.. .
geoff wrote:

Maxie, can you point to some figures about this 7 years, or did you
just make that up?


I have seen the figure quoted in several trade mags

Prolly not in the manufacturers brochures you use (for some reason)

Drivel

This pervo needs locking up. Tagging is too good for him.

It's always easy to tell when Drivel has been rattled - he posts
multiple responses to the same post and he cuts all context from his
reply.

"Steve Firth" wrote in message
...
Doctor Drivel wrote:

"Steve Firth" wrote in message
.. .
geoff wrote:

Maxie, can you point to some figures about this 7 years, or did you
just make that up?


I have seen the figure quoted in several trade mags

Prolly not in the manufacturers brochures you use (for some reason)

Drivel

This pervo needs locking up. Tagging is too good for him.

It's

This pervo needs locking up. Tagging is too good for him.

In message , Doctor Drivel
writes

"geoff" wrote in message
news
In message , Doctor Drivel
writes

"geoff" wrote in message
...

Now have quote from plumber of £130 (inc VAT) for new HX, plus
fitting. I was a bit startled at the cost, but not much I can do
really. Will keep the old HX, try to de-scale it.
Plumber also mentioned could be fault in PCB, and these are £200 it
seems.
He suggested, if it is the PCB, following fitting of new HX, to
replace the boiler.
This combi is only 11 years old, are they all prone to faults?
My original vented system gas CF boiler was in use for about 25 years,
until it leaked.
Seems these new boilers are good for plumbers profits!


A plumber who can'r differentiate between a heat exchanger and a
pcb fault shouldn't be let anywhere near a boiler

11 years old ?

The expected lifetime of a modern boiler is 7 years (i.e just long
enough to be "fit for purpose")

Maxie, can you point to some figures about this 7 years, or did you
just make that up?

I have seen the figure quoted in several trade mags

Who published them? Maxie, it is lies and more lies.

Prolly not in the manufacturers brochures you use (for some reason)

Maxie, I doubt if it is in the makers brochures.


By ****, you're a retard

--
geoff

"geoff" wrote in message
...
In message , Doctor Drivel
writes

"geoff" wrote in message
news
In message , Doctor Drivel
writes

"geoff" wrote in message
...

Now have quote from plumber of £130 (inc VAT) for new HX, plus
fitting. I was a bit startled at the cost, but not much I can do
really. Will keep the old HX, try to de-scale it.
Plumber also mentioned could be fault in PCB, and these are £200 it
seems.
He suggested, if it is the PCB, following fitting of new HX, to
replace the boiler.
This combi is only 11 years old, are they all prone to faults?
My original vented system gas CF boiler was in use for about 25 years,
until it leaked.
Seems these new boilers are good for plumbers profits!


A plumber who can'r differentiate between a heat exchanger and a pcb
fault shouldn't be let anywhere near a boiler

11 years old ?

The expected lifetime of a modern boiler is 7 years (i.e just long
enough to be "fit for purpose")

Maxie, can you point to some figures about this 7 years, or did you just
make that up?

I have seen the figure quoted in several trade mags

Who published them? Maxie, it is lies and more lies.

Prolly not in the manufacturers brochures you use (for some reason)

Maxie, I doubt if it is in the makers brochures.

By ****, you're a retard

Maxie, you are a one, Always joshing. What a fella. You must look
fabulous in your turned down wellies and donkey jacket. What a fella. A
breath of fresh indeed. Do you come out with snappy chatter on stage Maxie?
Fantastic.

John wrote:
In article
.com, 4square writes
7 years boiler life - is this generally recognised as being
satisfactory? Why so short, when I have an 18-year-old car, a 20yr-
old fridge/freeezer, 25yr-old electric oven / gas hob, all subject
to daily use, with no serious faults. Also, a new wall-hung boiler
means yet more holes in load-bearing walls, for mountings and
vents, and draining of CH system, all extra labour costs. It could
be concluded, that these combi's are not designed and built correctly
in the first place.

In my (albeit limited) experience, combis are a waste of time unless you
have an electric shower and have one rated about 3 times what they say
on the tin!


We have no problem with ours (Vaillant 242e, same as original poster) in
conjunction with a Diva thermostatic mixer and Grohe rainshower head. People
can even run other hot or cold taps in the house and the person in the shower
only notices the drop in pressure.

"chunkyoldcortina" wrote in message
...
John wrote:
In article
.com, 4square writes
7 years boiler life - is this generally recognised as being
satisfactory? Why so short, when I have an 18-year-old car, a 20yr-
old fridge/freeezer, 25yr-old electric oven / gas hob, all subject
to daily use, with no serious faults. Also, a new wall-hung boiler
means yet more holes in load-bearing walls, for mountings and
vents, and draining of CH system, all extra labour costs. It could
be concluded, that these combi's are not designed and built correctly
in the first place.

In my (albeit limited) experience, combis are a waste of time unless you
have an electric shower and have one rated about 3 times what they say
on the tin!

We have no problem with ours (Vaillant 242e, same as original poster) in
conjunction with a Diva thermostatic mixer and Grohe rainshower head.
People can even run other hot or cold taps in the house and the person
in the shower only notices the drop in pressure.

Some of Deva mixers have a pressure equaliser inside. Probably why your
shower reacts so quickly. If you had a beefier combi and a dedicated 22mm
cold feed pipe back to the stop tap, who would see even better performance.

In message , chunkyoldcortina
writes
John wrote:
In article
.com, 4square writes
7 years boiler life - is this generally recognised as being
satisfactory? Why so short, when I have an 18-year-old car, a 20yr-
old fridge/freeezer, 25yr-old electric oven / gas hob, all subject
to daily use, with no serious faults. Also, a new wall-hung boiler
means yet more holes in load-bearing walls, for mountings and
vents, and draining of CH system, all extra labour costs. It could
be concluded, that these combi's are not designed and built correctly
in the first place.
In my (albeit limited) experience, combis are a waste of time unless
you
have an electric shower and have one rated about 3 times what they say
on the tin!


We have no problem with ours (Vaillant 242e, same as original poster)
in conjunction with a Diva thermostatic mixer and Grohe rainshower
head. People can even run other hot or cold taps in the house and the
person in the shower only notices the drop in pressure.

Yeah, I used to have one, good flow rate, hardly any problems

well ... the fan bearings went (not a problem for me, of course) and
the (old style) secondary heat exchanger turned into a shower head when
I tried using my descaling machine on it - other than that a great
boiler

Took it out still working after 20 years service


--
geoff