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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
PHYSICAL DATA
*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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