>We live in a new build duplex (3 years old) which has dimplex electric
>storage heaters. All our walls and ceilings have a black 'soot /
>charcol' dust substance. It is that bad you can write your name in it!
> Inside the heaters also have this black dust. We believe the heaters
>have caused this. Has anyone else ever experienced this?
It is almost universal above any fixed heat producing device
including wall lights. The heat causes air to rise, the air carries
dust and traffic fumes which deposit on the walls. With lamps it can
take years to show up, with heaters much less time. The more the
heater is used the worse the problem becomes. Radiators have the
same effect but as they are often positioned under windows you don't
notice it.
The dust in the heater is similarly just airborne dust which has
deposited as air flows through it. If you live in urban pollution
the problem is exacerbated by the dirty air surrounding you.
Candles make things even worse by raising the pollution level and
providing nice sticky fumes for the dirt to adhere to.
It is not a fault with the heater.
--
Peter Parry.
http://www.wpp.ltd.uk/
>All our walls and ceilings have a black 'soot /
>charcol' dust substance. It is that bad you can write your name in it!
Then you must live in a very polluted location. Generally one can
only see this discolouration on the wall fairly near the heater.
Shelves over the heater will deflect it away from the walls.
> Inside the heaters also have this black dust.
This dust has come into the heater from the air passing through it.
Some of it has landed on the inside, the rest has continued through
the heater.
--
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
Perhaps they have less airborne dust - maybe they don't open their
windows as often, or have a more efficient vacuum cleaner, or have an
ioniser.
Owain
Article from an American mag here;
http://www.homeenergy.org/archive/hem.dis.anl.gov/eehem/98/980109.html
Candles can generate a lot of soot.
The convection air currents passing through the heaters are causing
the air & any soot to impinge on the walls.
The soot may also be from dust settling on the heater elements in
summer & getting burnt off at the start of the heating season.
>Thank you Peter but how come other apartments who use the heater more
>have no dust or discolouration at all??
All will have some - but it may not become noticeable for some years.
Possibly they have been redecorated in the last year or so, possibly
they are a bit better placed not to pick up so many vehicle fumes.
Candles contribute quite a lot of carbon, particularly if they are
used to mask cigarette smoking. A combination of smokers and candles
burned for several hours a day to mask the smell will produce quite
heavy discolouration in a few months whilst a similar house with
non-smokers and no candles may not have noticeable marking for
several years.