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Q-Mark HBB504 Electric Hydronic Baseboard Heater
Has a Navajo White Enamel Finish That Complements Homes

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A great way to supplement heat in your home is the Q-Mark HBB504 Electric Hydronic Baseboard Heater. It provides clean, quiet and comfortable heat to your home. It is safe as well. Its slim design and low operating temperatures make it safe to flush mount to any wall or variety of flooring including wood, carpet or tile. Carpet can even be installed up to and around the baseboard. Foreign objects have a difficult time getting past the heavy duty welded steel grilles and the high-strength Lexan that the fan is composed of is scratch and mark resistant.

The heating element on the Q-Mark HBB504 baseboard heater is electric, totally submerged in heat transfer liquid and sealed in a heater-length copper tube. The thermal constant of the whole heater is prolonged by the large diameter of the reservoir and the amount of heat storage fluid. The great retention capabilities of the hydronic element cause gentle heat to keep radiating after the thermostat turns off. For your safety, the heater has an automatic temperature shut off and is UL and CUL listed.

Order Information
Availability: Usually ships same business day
List Price: $199.00
Our Price: $149.95



AC Outlet  

Duplex Receptacle  

Inside Corner  

Outside Corner  


This is a limited time sale, order today and beat the rush. All shipping prices have been reduced. Use code "10HEAT" on checkout

  • Has a ten year manufacturer's warranty.
  • Is UL and CUL listed for your safety.
  • Has large heating fins.
Features and Specifications:
  • Model: Q-Mark HBB504
  • Product Type: Electric Hydronic Baseboard Heater
  • Product Length: 28 Inches
  • Product Color: Navajo White Enamel Finish
  • Volts: 240/208
  • Watts: 500/375
  • Amps: 2.1/1.8
  • Unit is Hardwired
  • Combined Boiler and Reservoir
  • Automatic Temperature Shutoff
  • Individual Room Control
  • Maximum Heat Retention
  • Large Wiring Compartment
  • UL Listed
  • Low Unit Surface Temperatures
  • Natural Convection
  • Large Heating Fins
  • Contemporary Styling
  • Mounts flush to Wall and Flat on Flooring
  • 10 Year Warranty

True Customer Testimonials

"I purchased this product because I added an additional hydronic baseboard heater to a project I completed earlier this year. I used the same brand and type of heater because I liked what I bought from you on my original order. It has performed excellently! We installed a fairly large solar electric system this past December. Part of the conversion is over to using solar/electric heat instead of our gas heating system. I also really like hydronic heaters versus the less expensive baseboard heaters. It provides silent, even heating. I would recommend this to others."
-Mac S. - Forestville, CA

"The hydronic design seems efficient. After the thermostat shuts off the heater, it continues to throw heat for several more minutes. Sensible design. I am considering retrofitting my entire house with this type of system."
-David B. - Temple, NH

Optional Accessories Available For The QMark Baseboard Heater HBB Models






25 amp at 120-277 Single Pole Thermostat HBBT1: Single pole thermostats break only one side of the power line to your heater and cannot be turned ''off.'' Therefore, power is continuous to the heater even if it is not running. The control knob will have a low temperature setting without an ''off'' position. These thermostats generally have a temperature range of 40 to 90 degrees. The thermostat attaches in the end cap of the heater.




Duplex Receptacle 15 amps at 120 VAC HBBDR: An optional accessory that attaches and makes an additional two plug outlets for any baseboard heater. This accessory will add 8 inches to the length of the baseboard heater as it attaches to the end cap of the heater.

25 amp at 120-277 VAC Double Pole Thermostat HBBT20: A "Double Pole" is an older term for a switch that allows you to turn both sides of the filament on and off - actually turning it completely off making it much safer than leaving it always energized. Double pole thermostats should be used for zonal heat systems such as electric fan heaters, baseboard heaters, and radiant heaters. This thermostat attached within the end cap.

Two Pole Tamper-Proof Thermostat: A standard two pole thermostat but with a tamper proof guard that resembles a small disc covering, which is only removable with a screwdriver. Once it is off, an inside stem is clearly visible. This is then rotated with a screwdriver or with your fingers. This thermostat attached within the end cap.

Inside Corner CBDCIC: Allows two baseboard heaters to be set up next to each other on walls that are at a right angle to each other. If you were standing in the corner, the point of the corner would point away from you.

Outside Corner CBDCOC: If you were facing the point of this corner, it would be pointing towards you..

AC Outlet 20 Amps at 208/240 VAC HBBAC: This accessory enables you to install a 240 volt 20 amp outlet to your baseboard heater.

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