Smallest Installed Footprint
The MVB’s compact design allows for easy installation in the most challenging equip-
ment rooms. It’s easy to handle and install, but still user friendly to service. The MVB has
the smallest installed footprint of any vertical boiler, only 5.4 square feet. The MVB con-
tains all of it’s components to the inside of the cabinet, so there won’t be any fans or
valves hanging off the cabinet that need extra clearance. The compact design fits
through a 30” door opening making it the perfect choice for those hard to reach retrofit
projects.
Model
Venting
Category
†
Boilers
Water Heaters
Input
Min.
Input
Output
Efficiency
Input
Output
Efficiency
503
IV
500
435
87%
500
435
87%
125
753
IV
750
653
87%
750
653
87%
188
1003
IV
999
869
87%
999
869
87%
250
1253
IV
1250
1088
87%
1250
1088
87%
312
1503
IV
1500
1305
87%
1500
1305
87%
375
1753
IV
1750
1523
87%
1750
1523
87%
438
2003
IV
1999
1739
87%
1999
1739
87%
500
504
I*
500
420
84%
500
420
84%
357ª
754
I*
750
630
84%
750
630
84%
536ª
1104
I*
1100
924
84%
1045
888
85%
786ª
1504
I*
1500
1260
84%
1425
1211
85%
1071ª
2004
I*
1999
1679
84%
1900
1615
85%
1428ª
MBTUH
Models
Dimensions (inches)
Operating
Weight
(lbs.)
Amps
‡
MVB
Cat. I*
MVB
Cat. IV
B
Ht.
D
E
F
G
†
NPT
H
NPT
K-Ø
Cat. I*
K-Ø
Cat. IV
M
Cat I*
M
Cat IV
N
CA Ø
P
R
V
504
503
43
32
35
23-3/4
1
2
8
6
14-1/8 14-1/2
6
35
6
2
600
12
754
753
49
38
41
29-3/4
1
2
10
6
16
14-1/2
6
41
6
2
660
12
1104
1003
55
44
47
35-3/4
1-1/4
2-1/2
10
6
16
14-1/2
6
47
6
2
720
12
1504
1253
61
50
53
41-3/4
1-1/4
2-1/2
12
8
18-1/8 17-3/4
8
53
6
2
780
12
1503
67
56
59
47-3/4
1-1/4
2-1/2
8
17-3/4
8
59
6
2
840
12
2004
1753
75
62
65
53-3/4
2
2-1/2
14
8
20-1/8 17-3/4
8
68
9
5
940
18
2003
81
68
71
59-3/4
2
2-1/2
8
17-3/4
8
74
9
5
1000
18
PHY
SICAL
D
A
TA
*Category I with vertical vent, category III with horizontal venting and no extractor.
†Category IV requires sealed vent with condensate drain. Category I uses conventional B vent.
ªBoilers only.
Note: Ratings are for natural or propane gas and for elevations up to 5,000 ft. above sea level. For higher elevations, consult the factory.
*Category I with vertical vent, category III with horizontal venting and no extractor.
†NPT is for Natural Gas. For Propane, NPT= 1” for all water heater/boiler sizes.
‡Current draw is for heater only. (Supply breaker must have a delayed trip.)
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