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INSTALLATION, OPERATING, AND
SERVICE INSTRUCTIONS
HEAT-FLO INDIRECT-FIRED WATER HEATERS
MODELS 30, 40, 40L, 50, 60, 60L, 80, 115
AND 60-HO, 80-HO, 80-HO-C, 115-HO, 115-HO-C
85-XHO, 115-XHO HIGH OUTPUT UNITS
FOR SINGLE WATER HEATER INSTALLATIONS
For service or repairs to the water heater, call your heating contractor. Your water heater has been manufactured
to provide years of service. In order to insure proper service, the following information is provided to assist
in enabling the installation, operation, and maintenance of this water heater. For your comfort, safety, and
convenience, we recommend that this water heater be installed and serviced by a plumbing professional. When
the installation is completed, keep this manual with the water heater. Information and specifications outlined
in this manual in effect at the time of printing of this manual. Heat-Flo reserves the right to discontinue, change
specifications, or change system design at any time without notice.
Heat-Flo, Inc.
15 Megan Ct., P.O. Box 612 Uxbridge, MA 01569 USA
Conforms to UL STD 174 and NSF/ANSI 372
Certified to CAN/CSA STD C22.2 No. 110-94
Bulletin I0-010115
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Summarization of Contents
Safety Information
Hazard Symbol Definitions
Defines DANGER, WARNING, CAUTION, and NOTICE symbols to convey risk levels.
Installation Compliance and Safety
Installation, Warnings, and Water Quality
Details installation compliance, electrical codes, critical safety warnings, and water quality requirements.
Operational Safety
Key Safety Precautions for Operation
Provides crucial safety precautions for operating the water heater, including grounding and supervision.
Pre-Installation Planning
Sizing and Boiler Compatibility
Guidance on selecting correct water heater and boiler sizes, and understanding heat transfer ratings.
System Configuration and Operation
Zone Control, Priority, and Piping
Explains zone control methods, priority settings, and general piping considerations.
Installation Location and Components
Location, Clearances, and Additional Components
Provides guidelines for heater placement, clearances, and lists essential additional components.
System Removal and Piping
Removing Old Systems and Domestic Piping
Instructions for removing old systems and connecting domestic water supply lines.
Boiler Water Piping
Boiler Water Piping Configurations
Illustrates boiler water piping for systems with zone circulators and zone valves.
Electrical, Operation, and Scalding
Electrical Wiring, Startup, and Scalding Prevention
Covers electrical wiring, startup, operation, and critical scalding prevention measures.
Water Temperature Adjustment
Setting Optimal Water Temperature
Recommends setting the thermostat to the lowest satisfactory temperature for energy efficiency.
Maintenance and Cleaning
Annual Maintenance and Coil Cleaning
Details annual inspections, sediment/scale management, and chemical cleaning procedures.
Anode Maintenance
Anode Inspection and Replacement
Guidance on inspecting and replacing the anode to protect against aggressive water.
Troubleshooting
Common Problems and Solutions
Addresses common issues like no hot water, insufficient hot water, and water temperature problems.
Replacement Parts List
Component Identification
Provides a list of replacement parts with corresponding Heat-Flo part numbers for identification.
Warranty Information
Coverage, Limitations, and Responsibilities
Details warranty coverage, limitations, exclusions, and owner/installer responsibilities.
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