<s>
The	O
data	B-Application
furnace	I-Application
is	O
a	O
method	O
of	O
heating	O
residential	O
homes	O
or	O
offices	O
by	O
running	O
computers	O
in	O
them	O
,	O
which	O
release	O
considerable	O
amounts	O
of	O
waste	O
heat	O
.	O
</s>
<s>
Data	B-Application
furnaces	I-Application
can	O
theoretically	O
be	O
cheaper	O
than	O
storing	O
computers	O
in	O
huge	O
data	B-Operating_System
centers	I-Operating_System
because	O
the	O
higher	O
cost	O
of	O
electricity	O
in	O
residential	O
areas	O
(	O
when	O
compared	O
to	O
industrial	O
zones	O
)	O
can	O
be	O
offset	O
by	O
charging	O
the	O
home	O
owner	O
for	O
the	O
heat	O
that	O
the	O
data	B-Operating_System
center	I-Operating_System
gives	O
off	O
.	O
</s>
<s>
Some	O
large	O
companies	O
that	O
store	O
and	O
process	O
thousands	O
of	O
gigabytes	O
of	O
data	O
believe	O
that	O
data	B-Application
furnaces	I-Application
could	O
be	O
cheaper	O
because	O
there	O
would	O
be	O
little	O
to	O
no	O
overhead	O
costs	O
.	O
</s>
<s>
The	O
cost	O
of	O
a	O
traditional	O
data	O
storage	O
center	O
is	O
up	O
to	O
around	O
$400	O
per	O
server	O
,	O
whereas	O
the	O
overhead	O
cost	O
per	O
server	O
of	O
a	O
home	O
data	B-Application
furnace	I-Application
is	O
around	O
$10	O
.	O
</s>
<s>
The	O
first	O
kind	O
of	O
data	B-Application
furnace	I-Application
(	O
DF	O
)	O
could	O
be	O
a	O
low	O
cost	O
seasonal	O
DF	O
.	O
</s>
<s>
This	O
kind	O
of	O
DF	O
would	O
use	O
an	O
existing	O
broadband	B-General_Concept
connection	O
to	O
perform	O
delay-tolerant	O
jobs	O
such	O
as	O
content	O
indexing	O
or	O
the	O
processing	O
of	O
large	O
sets	O
of	O
scientific	O
data	O
.	O
</s>
<s>
For	O
a	O
data	B-Application
furnace	I-Application
heating	O
water	O
,	O
the	O
heating	O
needs	O
to	O
be	O
at	O
least	O
56°	O
C/	O
133°F	O
to	O
prevent	O
the	O
development	O
of	O
pathogens	O
while	O
limiting	O
the	O
risks	O
of	O
skin	O
.	O
</s>
<s>
Unlike	O
traditional	O
data	B-Operating_System
centers	I-Operating_System
that	O
are	O
constantly	O
monitored	O
,	O
data	B-Application
furnaces	I-Application
should	O
be	O
treated	O
as	O
the	O
most	O
insecure	O
environment	O
for	O
data	O
storage	O
.	O
</s>
<s>
A	O
German	O
company	O
Cloud&Heat	O
offers	O
hot	O
water	O
heated	O
by	O
a	O
distributed	O
data	B-Operating_System
center	I-Operating_System
installed	O
in	O
the	O
premises	O
.	O
</s>
