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BTH ULTRA Electric Boilers Installation & Operation manual (Revision: June 2015) 4
Section 1: Technical specifications
Table 1: Technical data on boilers operating at 240 Vac /1ph
1
:
BTH
ULTRA
Capacity
(KW)
Amps
2
Heating
Elements (240 V)
Stages
Suggested size at 240V/1ph.
3
Cable
Breaker
(Amp.)
Cu
Al
208V
240V
208V
240V
12
9,0
12
43.5
50
4 x 3 KW
4
6
4
70
15
11.2
15
54.3
62.5
2 x 3 KW +
2 x 4.5 KW
4
6
4
80
18
13.5
18
65.2
75
4 x 4.5 KW
4
4
2
100
20
15
20
72.5
83.3
4 x 5 KW
4
3
2
110
24
18
24
87
100
4 x 6 KW
4
2
0
125
27
20.2
27
97.9
112.5
6 x 4.5 KW
6
1 x 1
or
2 x 6
4
1 x 00
or
2 x 4
4
2 x 80
or
150
29
21.7
29
104
120
4 x 5 KW +
2 x 4.5 KW
6
1 x 1
or
2 x 6
4
1 x 00
or
2 x 4
4
2 x 80
or
175
33
25
33
119.6
137.5
3 x 5 KW +
3 x 6 KW
6
2 x 4
5
2 x 2
5
2 x 100
36
27
36
130.5
150
6 x 6 KW
6
2 x 4
5
2 x 2
5
2 x 100
1
Electrical supply 120/240V or 120/208V – 1ph (L1-N-L2) with three conductors and a ground or a supply
with two conductors 240V or 208V – 1ph (L1-L2) with a ground if the application does not require a 120V
electrical supply for external accessories such as a pump, etc
2
Add the amperage of the circulating pump and other external accessories if they are connected to the
boiler (max. 5A).
3
A higher cable size could be required. In all cases the local electrical code has priority. The electrician has
the responsibility to select the appropriate size.
4
Two main terminal blocks that could be converted to one on the job site.
5
Two double pole breakers
1 kW = 3412 Btu
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