Operating Guide
2
PLEASE NOTE: 45H IS FOR OUTDOOR PERMANENT INSTALLATIONS ONLY AND 45HI IS FOR INDOOR PERMANENT INSTALLATIONS ONLY. THIS MANUAL 
AND ALL ECCOTEMP CONTECT IS SUBJECT TO CHANGE WITHOUT NOTICE. PLEASE VISIT WWW.ECCOTEMP.COM/SUPPORT FOR MORE INFORMATION.
Phone: 866-356-1992 | Email: Support@eccotemp.com | Address: 315 - A Industrial RD Summerville, SC 29483
English
Support: Eccotemp.com/help-desk Shop Online: Eccotemp.com/products Store Locator: Eccotemp.com/locator
FOR YOUR RECORDS
Write the model and serial numbers here:
#_______________________________
#_______________________________
You can nd them on a label on the water heater
and/or packaging.
Staple sales slip or canceled check here.
Proof of the original purchase date is needed to 
obtain service under the warranty.
READ THIS MANUAL
Inside you will nd many helpful hints on how to 
use and maintain your water heater properly. A 
little preventive care on your part can save you 
time and money over the life of your water heater. 
You’ll nd many answers to common problems in 
the Troubleshooting Guide. If you review the chart 
of Troubleshooting Tips rst, you may not need to 
call for service.
READ THE SAFETY INFORMATION
Your safety and the safety of others are very 
important. There are many important safety 
messages in this manual and on your water 
heater. Always read and obey all 
safety messages. This is the safety 
alert symbol. Recognize this symbol 
as an indication of Important Safety 
Information! This symbol alerts you
to potential hazards that can kill or hurt
you and others.
All safety messages will follow the safety alert
symbol and either the word “DANGER”, 
“WARNING”, “CAUTION” or “NOTICE”.
These words mean:
DANGER - An imminently hazardous situation
that will result in death or serious injury.
 WARNING - A potentially hazardous situation
 that could result in death or serious injury
 and/or damage to property.
 CAUTION - A potentially hazardous situation
 that may result in minor or moderate injury.
 NOTICE: Attention is called to observe
 a specied procedure or maintain a
 specic condition.
Safety Information
Safety Precautions .................. 3-6
45-H Installation Instructions
Location .......................................7-8
Typical Installation ........................9
Water Connections .....................10
Gas Supply.....................................10
Relief Valve.....................................11
Leak Testing....................................12
High Altitude ...............................12
Venting ..........................................12
Remote Control ....................13-14
Electrical Connection ................15
Pipe Insulation .............................16
Mounting ......................................17
Installation Checklist .................18
45-HI Installation Instructions
Location ................................. 19-21 
Typical Installation .....................22
Water Connections ............23-24
Gas Supply.....................................24 
Relief Valve.....................................25
Leak Testing...................................25
High Altitude ............................. 25 
Venting ....................................26-31 
Remote Control ..................32-33 
Electrical Connection ...............34 
Pipe Insulation ............................35 
Mounting ......................................36
Installation Checklist .................37
Operating Instructions
Start Instructions .................38-39 
Water Temperature ...................40
Temperature Memory...............40
Care and Cleaning
Maintenance ................................41
Housekeeping ......................41-42
Extended Shut-Down ...............42
Anti-Freezing.........................42 
Draining ..................................42-44
Troubleshooting Tips
Before You Call ............................45
Error Code Guide .......................46
Customer Service
Parts List...................................47-48










