STERLING HSB36011 Hot-Water Unit Heater | Montreal, Laval, Longueuil, South Shore & North Shore

The largest unit heater in Sterling’s HS series, for very large open spaces

What the HSB36011 is

The Sterling HSB36011 tops the HS series. This horizontal hot-water unit heater hangs below the ceiling, circulates the water from your loop through a standard header-type coil and blows 5,500 CFM of warmed air, at 1,000 FPM at the outlet, through horizontal louvers that come standard. With 200°F entering water, 60°F entering air and a 20°F drop, Sterling rates it at 261,300 BTU/h, the highest value in the series.

Its 1/2 HP motor is single speed and runs on 115 V, single phase, 60 Hz. According to the manufacturer’s manual, the designs are certified by ETL to CSA C22.2, UL 1995 and UL 60335-2-40.

A single large unit: benefits and limits

In a large maintenance hangar, a very high-ceiling warehouse or a large plant, a single HSB36011 can replace several units. Piping and electrical work are simplified. On the other hand, a breakdown leaves the whole space without heat, and the air spreads less evenly in an irregular or cluttered building. We present both options, one large unit or several smaller ones, from the heat-loss calculation and the floor plan.

Water decides the actual output

The 261,300 BTU/h rating applies to 200°F water. Sterling publishes the factors to apply below that: 0.857 at 180°F, 0.715 at 160°F, 0.571 at 140°F, 0.429 at 120°F and 0.286 at 100°F. With an electric boiler set high, the unit comes close to its rating; with a low-temperature air-to-water heat pump, more than one unit may be needed.

The coil needs 26.2 GPM with a 20°F drop and creates a pressure drop of 2.1 ft H2O: at those values, we check the circulator, the pipe size and the boiler’s spare capacity. If the loop can freeze, it can contain propylene glycol; Sterling publishes correction factors for that mix. The coil is rated up to 150 PSI (1,034 kPa) or 320°F (160°C) on hot water.

What our installation covers

Before ordering, we obtain from Sterling the weight, dimensions and pipe connection size, which are missing from the data we verified: for a unit this size, they determine the supports, the piping and the location. On site, our technicians hang the unit heater on its rods, level it, fit the isolation valves and air purging, then connect the 115 V supply according to the nameplate, along with the control. Start-up ends with measuring the flow and the temperature drop.

AirGreen is a family business established in Montreal for more than fifteen years, holding RBQ licence 5645-9605-01 (ventilation, refrigeration and electrical). We serve Montreal, Laval, Longueuil, the South Shore and the North Shore.

Ask for a free on-site estimate: your written quote compares the single-unit and multi-unit options at your water temperature, with financing available.