Fill Control Valve

Amtrol 109-15 Fill Control Valve
A replacement fill control valve used with the Amtrol Fill-Trol boiler system to automatically maintain system fill pressure in closed-loop hydronic heating systems when the correct Fill-Trol valve is required.

Key Features

• Replacement part identified as a Fill Control Valve
• Listed use: Fill Control Valve for Fill-Trol Tank Model 109-1, 110-2, 111-1, and 112-1
• Amtrol describes the Fill-Trol fill control as a specially designed, automatic, pressure-reducing fill valve used as part of the Fill-Trol system
• Amtrol states the Fill-Trol system eliminates the need for a separate automatic fill valve and is fully adjustable up to a maximum working pressure of 100 psig
• Amtrol states the Fill-Trol system is factory pre-charged to 12 psig and that tank pressure controls system fill

Compatibility & Applications

• Listed for Amtrol Fill-Trol tank models 109-1, 110-2, 111-1, and 112-1.
• Must only be used where the manufacturer specifies this exact part number: 109-15.

Installation & Operation Notes

• Installation should be performed by a qualified hydronic/heating technician.
• Reference the Fill-Trol system installation/operation documentation and the boiler/system service manual for the correct isolation, depressurization, and checkout procedures.
• Manufacturer notes for Fill-Trol operation: the fill valve admits make-up water until the system reaches the fill pressure (described as 12 psig), then shuts off; when system pressure falls below that point, it opens to restore pressure.
• Important fit note from product Q&A: the tank-side connection is not standard NPT, because Fill-Trol tanks use a special thread and fitting compared to standard Extrol tanks.

Maintenance & Troubleshooting

• This valve is commonly replaced when the existing Fill-Trol fill control is defective or not maintaining expected fill behavior.
• Documentation describes the intended function as maintaining fill pressure automatically; if the system does not maintain pressure as expected, use the Fill-Trol/boiler troubleshooting guidance to verify the valve is operating correctly for the application.
• User feedback includes a case where the valve "wouldn't admit enough water" to serve upper floors; in those situations, confirm the Fill-Trol system is appropriate for the building/system requirements and follow the system documentation for corrective steps.

User Reviews & Q&A Summary

• Review themes commonly describe it as an exact replacement and a straightforward install, with some DIY users noting significant savings versus hiring a contractor.
• Several reviewers mention it works well once they understood how the control valve operates, and many comments highlight fast shipping and good purchasing experience.
• Negative feedback includes at least one report of inadequate fill performance for a taller home (upper-floor heating), suggesting application fit matters.
• Q&A theme: the Fill-Trol tank connection uses non-standard threads (special Fill-Trol fitting), which can prevent a standard 1/2" male thread from starting.