STERLING HSB06011 Hot-Water Unit Heater | Montreal, Laval, Longueuil, South Shore & North Shore
The Sterling HSB06011 blows 900 CFM of air warmed by hot water, 43,600 BTU/h with 200°F water, for the door zones of garages and parking entrances.
Model numberHSB06011
514 316-2973 · sales@airgreen.ca
Quick facts
Keep the shop warm, even when the garage door opens
A unit heater designed for door zones
In an auto repair shop, an equipment shed or the entrance to an underground parking garage, heat is lost mostly through the large door. The Sterling HSB06011 answers that need with an airflow of 900 CFM and an outlet velocity of 650 FPM. Hung from the ceiling, it takes the hot water from your loop, runs it through its coil and sends the warmed air down through horizontal louvers that come standard.
With 200°F entering water, 60°F entering air and a 20°F drop, Sterling publishes 43,600 BTU/h. At reduced speed, the rating becomes 39,200 BTU/h at 700 CFM. The 1/20 HP motor runs on 115 V, single speed; it is totally enclosed with thermal overload protection.
In Quebec: garage doors, long winters and glycol loops
A door zone is exposed to the cold. When part of the loop runs through a space that can freeze, such as a parking ramp, it is often filled with propylene glycol rather than plain water. Sterling publishes correction factors for that mix, and we apply them to the output calculation.
Water temperature matters just as much. Your electric boiler or air-to-water heat pump does not necessarily supply 200°F. The factors Sterling publishes are 0.857 at 180°F, 0.715 at 160°F, 0.571 at 140°F and 0.429 at 120°F. The right choice is therefore made with the actual temperature, a heat-loss calculation, and allowing for door openings.
On the hydronic side, the unit needs 4.4 GPM with a 20°F drop, for a pressure drop of 0.17 ft H2O.
How we install it
We visit the site and look at the door, the free height and the ceiling structure. Mounting height and air throw are not in the data we verified: we set the location with Sterling’s installation manual. Then our technicians:
- hang the unit heater by rods, properly level;
- connect it to the loop, with isolation valves and air purging;
- connect the 115 V supply and the control;
- start it up and check the flow.
A family business established in Montreal for more than fifteen years, AirGreen holds RBQ licence 5645-9605-01 (ventilation, refrigeration and electrical). We serve Montreal, Laval, Longueuil, the South Shore and the North Shore.
Your garage door, your calculation
Ask for a free on-site estimate. You receive a written quote that accounts for your door, your loop and its temperature, with financing available.
For spaces where a large door opens in the middle of winter
A garage door left open for a few minutes is enough to chill a workshop. The HSB06011, hung from the ceiling, sends 900 CFM of air heated by your hot-water loop back toward the work area.
- Neighbourhood auto repair shop with an overhead door
- Entrance and ramp of a condo building’s underground parking
- Snow-removal equipment shed
- Receiving dock of a small business
Specifications
From the manufacturer’s documentation. A value the manufacturer does not publish is not listed.
What to know before installing
- Below 200°F, output decreases: Sterling gives a factor of 0.857 at 180°F and 0.571 at 140°F. With glycol, its factors specific to that mix also apply.
- Mounting height and air throw are not in the verified data: we set the location according to Sterling’s installation manual and the layout of the space.
- Plan a 115 V, single-phase, 60 Hz supply near the unit.
- The unit hangs by rods from the connections provided and must be level.
Manufacturer documents
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Frequently asked questions
Why 43,600 BTU/h when the model carries the code 060?
The model code follows another of Sterling’s rating bases. On hot water, with 200°F water, 60°F air and a 20°F drop, the rating is 43,600 BTU/h. That figure, corrected to your water temperature, is the one used to choose.
Where should it go relative to the garage door?
We set the location according to Sterling’s installation manual and the layout of the space. The unit blows at 650 FPM at the outlet, through horizontal louvers supplied as standard.
Does it suit an underground garage entrance?
It can, if a hot-water or propylene glycol loop reaches it and the ceiling can carry it. We check the corrected output for the loop’s temperature and fluid.
Is the reduced-speed rating useful?
Sterling publishes 39,200 BTU/h and 700 CFM with the fan slowed down. The standard motor is single speed: if that operation interests you, we check with the manufacturer what it requires.
A well-heated door zone, installed by AirGreen
Tell us about your project: we check the sizing, confirm availability and send you a quote. Or let our technicians install it for you.
Specifications from the manufacturer’s documentation, checked on October 19, 2026.