Installation Guide

GENERAL INFO
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.