D
IA
GR
A
M
SH
OW
IN
G
H
E
A
T
H
ER
O
D
IR
EC
T
I
N
A
D
U
A
L
H
E
A
T
IN
G
SYST
E
M
C
ON
N
EC
T
ED
T
O
A
N
OI
L
OR
G
A
S
B
OI
L
ER
W
IT
H
A
P
R
ESSU
R
E
C
YL
IN
D
ER
,
SOL
A
R
A
N
D
R
A
D
IA
T
OR
S
S
e
e
d
e
tail
e
d
V
ide
o
on w
e
bsi
te
w
ww
.h
e
a
th
e
ro.i
e
3
O
P
T
IO
N
A
L
G
R
A
V
IT
Y
CIRCUIT
T
O
R
A
DI
A
T
O
RS
Summary of Contents for HERO DIRECT
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