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Model HT

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Model HT

under-cabinet hydronic heater

King’s HT Series Kickspace hydronic heater uses the energy from a building’s existing hot water source to offer efficient, whisper quiet operation and the ability to reduce utility bills with individual room control. By installing hydronic heaters in every room, you can easily heat only the areas in use and conserve energy. Uniquely designed to add heat to areas of the home previously thought not possible. With a compact, space-saving design the HT heater can be inconspicuously installed in the kick-space area at the base of kitchen and bathroom cabinets, under window sills or even in stair risers, providing warmth and comfort to formerly troublesome areas. Provides 1600 to 9950 BTU heat output.

  • Under Cabinet, Fan-Driven, Zone-Controlled Heat
  • Heat Only The Rooms Which Need It, Borrowing Energy From What’s Already There: The Hot Water Heater.
  • Compatible With Typical Hot Potable Water sources
  • Tangential Blowers For Whisper Quiet Operation
  • Fast Coil Heating For Heat Transfer
  • 1/2” Trade Size Copper Tubes
  • Flow-Through Design
  • 4 or 8 Aluminum fins per inch
  • Permanently Lubricated Motor
  • Hi / Off / Lo Fan Switch
  • Aqua Stat Included
  • For Use With HW Series Thermostats
  • ETL Certified for USA and Canada
  • Proudly Made in the USA with U.S. & Global Materials
  • 1-year limited warranty

Borrow Energy From The Hot Water Heater

Hydronic heaters use hot water from home’s hot water tank and gently recirculates heat throughout the room. Heat only the rooms which need it, borrowing energy from what’s already here: the hot water heater.

Now That’s Smart!

Quiet, Cost-Saving Zone Control

King’s hydronic system offers cost-saving zone control, heat source sharing, near silent operation, quality construction, and easy installation.

Available Models

Ordering Information

MODELFINS PER INCHFT. OF WATER PRESSURE DROP @ 2 GPMAMPSRPMCFMBTUH@2GPMPurchase
HT412 2/380.360.54200083High Speed17002500340046005200
HT612 4/5-AS/FS-GW80.540.51180076Low Speed24003250435060006500Buy Now
HT812 5/780.720.51180076Low Speed32004300540070008400
* Aqua Stat not required when using a King HW series hydronic thermostat with fan start-up delay. In-built Aqua Stat (AS) is available, consult factory for price and availability. Coils are made of copper alloy 122 manufactured to ATSM B-75 specifications. Brazing alloy is AWS-BCUP2 for use with potable water systems. Electrical circuit size: 15 amp maximum. BTU ratings based on 68˚ entering air. To calculate 1 GPM, multiply by 0.95. To calculate 4 GPM, multiply by 1.05. Grille colors available in White (-GW) or Black (-GB) or Almond (-GA). Add suffix to end of model number.

Ordering Information

MODELCONTROLS AQUA STATCONTROLS FAN SWITCHGRILLES WHITEGRILLES ALMONDGRILLES BLACKWATER TEMPERATURE 140ºF/60ºCWATER TEMPERATURE 160ºF/72ºCVOLTSAMPS
HT412 2/3ASFSGWGAGB250034001200.36
HT612 4/5ASFSGWGAGB400051001200.36
HT812 5/7ASFSGWGAGB500066001200.54

Replacement Accessories

ADD SUFFIXUPCDESCRIPTIONWT. (lbs.)
HT GRILL21050HT Accessory Grill 20" White0.8
HT GRILL N/S20861HT Accessory Grill 20" White No Switch0.8
HT GRILL -B21141HT Accessory Grill 20" Black0.8
HT GRILL -B N/S20862HT Accessory Grill 20" Black No Switch0.8

Engineering Specs

Contractor shall supply and install H Series hydronic fan heaters manufactured by King Electrical Mfg. Co., Seattle, Washington.

Motor: 2 speed shaded pole impedance protected. Permanently lubricated. Bronze bearings.

Blower: Tangential blower to provide 83 CFM or 76 CFM of air. Quiet operation of less than 53 dB A weighted scale at high speed. Easily removed for service. Bronze, not plastic, bearings.

Coils: 1/2″ trade size Copper tubes with Aluminum fins of no more than 4 fins per inch for free flow of air and maximum circulation of air and water. Tested at 300 PSI for leaks. Bleed valve to purge air. Copper tube used in coils is Alloy 122 made to ASTM B-75 specifications.

Grill: 20 gauge mild Steel, louvered with Nickel-plated grill screws. Powder-coated in white.

Wall Can: 20 gauge mild Steel, electro-galvanized to resist corrosion. 1/2″ knockout in bottom of can and QuickSetTM bend out mounting tabs for fast installation.

Fan Switch: 3 position fan switch High / Off / Low. Rated at 10 Amps with wire leads and insulated 1⁄4″ quick connects.

Aqua Stat: Ensures the water temperature is over 115°F before the fan turns ON

Terminal Board: All electrical connections will terminate at a phenolic terminal board with 1⁄4″ male brass blades for easy wiring.

Water Connections: 5/8″ bare Copper tubes de-burred. Tested at 300 PSI for leaks. Clean out tubes for water connection.

Approvals: cETLus. . All King heaters are tested to UL 1995 Standards. Approved for USA and Canada. CSA/C22.2.