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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
Pre-installation Considerations
Important Considerations Before Installation
Outlines key factors for selecting the correct water heater and boiler size for optimal performance.
System Zone Control
Priority or Non-Priority for Hot Water
Explains how to prioritize domestic hot water demand over space heating or vice versa.
Locating the Water Heater
Additional Recommended Components
Lists essential accessories like shut-off valves, unions, vacuum breakers, and expansion tanks.
Removing Existing Domestic Water Heating System
Water Quality Requirements
Details acceptable pH and chloride levels, recommending filters and softeners for optimal water quality.
Domestic Water Piping
Provides instructions for draining the domestic water system before installation.
Water Boiler Piping
Zone Circulator System
Describes how to pipe the water heater for systems using zone circulators.
Zone Valve System
Details the piping connections for systems utilizing zone valves.
Electrical Installation
Startup Procedure
Guides the user through the initial startup process after installation and wiring.
Operation and Thermostat Control
Explains how the thermostat controls heating and the importance of setting it appropriately.
Maintenance
Boiler and Domestic Water Piping Maintenance
Annual check of piping for leaks, unions, and shut-off valves.
Temperature and Pressure Relief Valve Maintenance
Annual check of the relief valve's operation and inspection for obstructions or corrosion.
Sediment and Scale Management
Chemical Cleaning of Heating Coil
Step-by-step instructions for cleaning the heating coil using a chemical solution.
Anode Inspection and Replacement
Annual inspection of the anode rod to prevent water heater damage from aggressive water.
Limited Warranty
Warranty Coverage for Residential Usage
Details warranty terms and conditions for water heaters used in residential settings.
Warranty Coverage for Commercial Usage
Outlines warranty terms and conditions for water heaters used in commercial applications.
Exclusions from Warranty Coverage
Owner's Responsibilities
Lists duties of the owner/installer for proper operation and maintenance to ensure warranty validity.
Limitations of Warranties and Remedies
Specifies limitations and remedies, excluding implied warranties and consequential damages.
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