The TPI 680 Series Bulldog (model HF686TC) is a hardwired-or-plug 240/208V fan-forced portable heater built for shops, garages, warehouses, jobsites, and agricultural buildings. Rated at 5,600/4,200 watts (19,107/14,330 BTU/hr), the steel-tubular finned element heats large spaces fast while a built-in thermostat holds the set point without cycling the user back to the dial.
Built for these jobs
- Auto and equipment shops — warm a 2- to 3-bay area to working temperature in winter without running the building furnace
- Construction jobsites and remodel work — on-demand heat for drywall, taping, and finish work that needs above-freezing conditions to cure
- Warehouses, loading docks, and garages — spot-heating around workstations where central heat is impractical
- Greenhouses and outbuildings — freeze protection for pump houses, storage sheds, and animal facilities (paired with appropriate building ventilation)
- Temporary heat for power outages — if a generator can deliver 240V single-phase the Bulldog will run from it
Why this heater earns its name
The Bulldog is built around a finned steel tubular heating element — a more durable design than the open coils used in cheaper space heaters. The 262 CFM fan throws warm air about 10 feet, giving the unit useful coverage for one or two work areas rather than just the immediate vicinity of the cabinet. The heavy-gauge steel housing and integrated mounting bracket let you set it on the floor, fasten it to a wall stud, or hang it from ceiling joists out of the way of foot traffic.
Specifications
- Voltage: 240/208 V, single phase
- Wattage: 5,600 W at 240V, 4,200 W at 208V
- Heat output: 19,107 BTU/hr at 240V, 14,330 BTU/hr at 208V
- Amperage: 23.4 A at 240V, 20.2 A at 208V
- Airflow: 262 CFM
- Air throw: 10 ft.
- Temperature rise: 75° F
- Built-in thermostat: 35 to 85° F adjustable
- Heating element: finned steel tubular
- Mounting: bracket included for wall, ceiling, or floor
- Approvals: UL Listed (US and Canada)
Frequently asked questions
Will this heater plug into a standard wall outlet?
No. The HF686TC is a 240/208V single-phase unit. It needs a dedicated 240V circuit and an appropriate plug or hardwire termination. A 120V outlet will not run it. If you need a 120V version, look at the smaller TPI Bulldog SKUs in this same line.
What size space does this heat?
At 19,107 BTU/hr it warms roughly a two-bay garage or a 600-1,000 sq. ft. shop space at typical residential ceiling heights, depending on insulation and outside temperature. For larger spaces, mount two units at opposite ends.
Does it have a built-in thermostat?
Yes. The integrated thermostat adjusts from 35 to 85° F, so you can set it for freeze protection at the low end or for working comfort at the high end and walk away.
Can I mount it overhead?
Yes. The included bracket is rated for ceiling, wall, or floor placement. For overhead mounting, follow the manufacturer's instructions for clearance to combustible materials and use appropriately rated hardware into structural framing.
Is the housing safe to touch when running?
The housing gets warm but is designed to remain safe-touch under normal operation. Like any portable electric heater, keep it away from drapes, papers, sawdust, and flammable solvents, and do not block the air intake or discharge.
Discount Cleaning Products is an authorized TPI dealer. Our US-based customer service team can help match a heater to the size of your space, sort out 240V wiring questions, and walk you through warranty registration after delivery.
