GENERAL INF
O
8 • Electric Tankless Water Heater
Electrical Requirements
•
Follow these steps to determine the electrical requirements for your water heater:
1.) Find your model number on your water heater’s rating plate.
2.) Locate that model number in one of the tables listed below.
For example, if your model is
RPVA-24-K5
, find
*P**-24-K5
in the appropriate table.
Models within each table are sorted by
Voltage
first, then by
Wattage per Element (KW)
.
•
Follow the requirements listed for your model.
□
Point-of-use models are listed below.
□
Two-chamber models: page 9.
□
Four-chamber models: page 10.
•
Use copper conductors only.
Point-of-Use Models
(For potable water heating only. Not for space heating.)
NOTICE: Models sorted by
Voltage
, then by
Wattage per Element
.
Model
Recommended
Breaker Size
(Amps)
Voltage
Number
of
Elements
Wattage
per Element
(KW)
Current per
Breaker
(Amps)
Recommended
Wire Size
*
(AWG)
Element Type
*P**-24-K5
25
120
1
2.4
20.00
10
Single
*P**-30-K5
30
120
1
3
25.00
10
Single
*P**-35-K5
30
120
1
3.5
29.17
10
Single
*P**-40-X5
20
208
1
4
19.23
12
Single
*P**-78-X5
40
208
1
8
37.5
8
Single
*P**-35-E5
20
240
‡
1
3.5
14.58
12
Single
*P**-45-E5
20
240
‡
1
4.5
18.75
12
Single
*P**-55-E5
25
240
‡
1
5.5
22.92
10
Single
*P**-70-E5
30
240
‡
1
7
29.17
10
Single
*P**-80-E5
40
240
‡
1
8
33.33
8
Single
*P**-90-E5
40
240
‡
1
9
37.50
8
Single
*P**-120-E5
60
240
‡
1
12
50
6
†
Dual
*P**-30-Y5
15
277
1
3
10.83
14
Single
*
All wiring/conductors must be rated for 90°C or greater.
† Maximum recommended wire size is #6 cu AWG.
‡ This model may used with a 208 VAC supply. Use of 208 VAC may require different breaker and/or wire sizes.
Follow all code requirements.
