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Product Type: Medium In-Wall Hydronic Heater
Heat Output: 3,300 to 18,700 BTUH
Fan Motor: 120V
Airflow: 150 to 375 CFM
Motor Options: Two-Speed Standard or Progressive ECM
Control: Hi / Off / Lo Fan Switch Included
Optional Control: Aqua Stat Available
Certification: ETL Certified for USA and Canada
Warranty: 2 Year Limited Warranty

Medium-capacity fan-driven hydronic wall heater for quiet, room-by-room heating in residential and commercial spaces.
The HM / HME Series medium in-wall hydronic heater uses an existing building hot water source to provide quiet, responsive zone heating. Designed to fit between standard wall studs, it is ideal for bedrooms, offices, living areas, apartments, and similar spaces. HM models use a two-speed motor, while HME models feature an energy-saving ECM motor that progressively increases airflow as needed. Both versions include a copper tube coil, aluminum fins, tangential blower, and Hi / Off / Lo fan switch.
| MODEL | FAN SPEED | Water Pressure Drop at 2 GPM | 120F 48C | 140F 60C | 160F 71C | 180F 8C 200F MAX | Motor Hi/Lo CFM | Decibels at 3-ft distance | Hi/Lo: Amps | Hi/Lo: Watts |
|---|---|---|---|---|---|---|---|---|---|---|
| HM1215-FS-BW | HGH | 0.9 | 8812 Btu | 11700 Btu | 15500 Btu | 18700 Btu | 5 Watt output | Hi 62 dbA | .42 / .38 Amps | 50.4 / 45.6 Watts |
| HM1215-FS-BW | LOW | 0.9 | 6600 Btu | 8800 Btu | 11600 Btu | 14000 Btu | 375 /220 CFM | Lo 58 dbA | .42 / .38 Amps | 50.4 / 45.6 Watts |
| Energy saver ECM Motor | FAN SPEED | Water Pressure Drop at 2 GPM | 120F 48C | 140F 60C | 160F 71C | 180F 82C | Progressive CFM | RUN / START | Energy Saver Hi/Lo: Amps | Hi/Lo: Watts |
|---|---|---|---|---|---|---|---|---|---|---|
| HME1215-FS-BW | HIGH | 0.9 | 8812 Btu | 11700 Btu | 15500 Btu | 18700 Btu | 150 to 375 High | Hi 63 / 60 dbA | .09 / .06 Amps | 10.8 / 7.2 Watts |
| HME1215-FS-BW | LOW | 0.9 | 6600 Btu | 8800 Btu | 11600 Btu | 14000 Btu | 150 to 250 Low | Lo 54 / 51 dbA | .09 / .06 Amps | 10.8 / 7.2 Watts |
| ADD SUFFIX | DESCRIPTION |
|---|---|
| -AS | Aqua Stat |
Furnish and install King Electric Model HM or HME medium in-wall hydronic fan heater. Unit shall be designed for recessed installation between standard wall studs and shall include a copper tube coil, aluminum fins, tangential blower, louvered steel grille, electrogalvanized wall can, and Hi / Off / Lo fan switch. HM models shall include a two-speed shaded-pole motor. HME models shall include a progressive energy-saving ECM motor. Optional Aqua Stat shall be provided where scheduled.

Fan driven hydronic heater for use with hot water from any energy source. The small size and quiet operation make it perfect for bedrooms.
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Fan driven Hydronic toe-space unit for kitchen and under-cabinet applications.
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Fan driven hydronic heater for use with hot water from any energy source. The large size and quiet operation make it perfect for larger living spaces.
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No drafts no cold spots. 5" high x 3" wide. It is ideal for residential, apartment and commercial applications. Custom lengths available.
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