KB-399
KB-500
KB-600
KB-700
KB-800
WATER
GALLON CAPACITY
3.4
4.2
4.2
5.0
5.7
HEATING SURFACE (SQ. FT.)
41.8
50.8
50.8
57.8
65.3
WATER CONNECTIONS
1-1/2”
1-1/2”
2"
2"
2"
DRAIN
3/4”
3/4”
3/4"
3/4"
3/4"
20°F
Δ
T WATER FLOW (GPM)
37
47
55
65
74
HEAD LOSS (FT. OF HD.)
21
23
31
30
33
35°F
Δ
T WATER FLOW (GPM)
21
26
32
37
42
HEAD LOSS (FT. OF HD.)
8
10
13
11
12
MAX. WORKING PRESSURE (PSI)
160
160
160
160
160
# OF RELIEF VALVES
1
1
1
1
1
RELIEF VALVE SIZE
3/4”
3/4”
3/4"
3/4"
3/4"
RELIEF VALVE RATING (MBH)
697
697
697
1,352
1,352
RELIEF VALVE PRESSURE RATING (PSI)
50
50
50
50
50
GAS
INLET CONNECTION
1”
1”
1"
1"
1"
MAX. INLET PRESSURE, NAT
10.5” w.c.
10.5” w.c.
10.5” w.c.
10.5” w.c.
10.5” w.c.
MIN. INLET PRESSURE, NAT
4.0” w.c.
4.0” w.c.
4.0” w.c.
4.0” w.c.
4.0” w.c.
MAX. INLET PRESSURE, LP
13.0” w.c.
13.0” w.c.
13.0” w.c.
13.0” w.c.
13.0” w.c.
MIN. INLET PRESSURE, LP
8.0” w.c.
8.0” w.c.
8.0” w.c.
8.0” w.c.
8.0” w.c.
BTU/HR INPUT
399,000
500,000
600,000
700,000
800,000
BTU/HR OUTPUT (HIGH FIRE)
372,267
466,500
567,600
660,100
752,000
BTU/HR OUTPUT (LOW FIRE)
74,453
93,300
113,520
132,020
150,400
ELECTRICAL
VOLTAGE/HEATER
120
120
120
120
120
VOLTAGE/CONTROL
24
24
24
24
24
TOTAL AMPS
1.5
1.7
2.7
2.7
2.7
# OF ELECTRICAL CONNECTIONS
1
1
1
1
1
DIMENSIONS
HEIGHT
42-1/2”
42-1/2”
42-1/2"
42-1/2”
42-1/2”
WIDTH
15-1/2”
15-1/2”
15-1/2"
15-1/2"
15-1/2"
DEPTH
27”
31-1/4”
36-1/4"
40-1/4"
45-1/4"
SERVICE CLEARANCES
FRONT
24”
24”
24”
24”
24”
BACK
14”
14”
14”
14”
14”
RIGHT SIDE
0”
0”
0”
0”
0”
LEFT SIDE (PIPING)
24”
24”
24”
24”
24”
TOP
24”
24”
24”
24”
24”
DIRECT VENTING
SIZE
4”
4”
4"
6"
6"
VENT CATEGORY
IV
IV
IV
IV
IV
VENT MATERIAL
PVC
PVC
PVC
PVC
PVC
KBX-PS-03
(Replaces KBX-PS-02 06/08)
06/08-Printed in U.S.A.
Lochinvar Corporation • 300 Maddox Simpson Pkwy • Lebanon, TN 37090 • 615-889-8900 / Fax: 615-547-1000
www.Lochinvar.com
KNIGHT
®
BOILER PRODUCT SUMMARY
(KB) 399,000 - 800,000 BTU/HR
