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AQUA PLUS indirect-fired water heaters — Product Manual
Troubleshooting
(continued)
4 Check boiler operating temperatures.
• If possible, increase the boiler operating temperature to 180°F or 200°F.
• Maintain a minimal temperature in the boiler during non-heating seasons.
• A boiler typically has a higher standby loss than the indirect water heater.
• After a long standby period, the colder boiler may absorb the stored energy within the water heater
during the initial call for heat.
5 Check location of flow control devices.
• Lab tests have shown that during long standby periods the boiler piping can act as a thermal siphon and
draw stored heat from the domestic water.
• Locate flow control devices (zone valve, spring check valves...) or heat trap loops in the boiler piping
close to the water heater.
• Insulate all boiler piping to and from the water heater.
6 Check for air in the system; check water heater air vent.
• An air-bound water heater or boiler will not circulate system water properly, resulting in a lack of heat
transfer.
7 Clean the boiler water system.
• A dirty boiler system can cause deposits to form on the water heater coil. This insulates the coil, reducing
the heat transfer.
• Clean the boiler system per the boiler manufacturer’s instructions.
• Install a strainer in the boiler piping on older installations or for systems likely to carry sediment.
Insufficient hot water (continued)
Part number GL-E223-ADOC 0311
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