STELPRO SFE SFE1821 Electric Furnace | 17.5 kW - 240V

17.5 kW: the right output when 15 kW is no longer enough

An in-between output, chosen with care

The Stelpro SFE1821 delivers 17.5 kW at 240 V. This size fills the gap between the 15 and 20 kW models of the SFE series: it fits when the heat loss calculation is above 15 kW without justifying 20 kW. A correctly sized furnace calls for an electrical supply in proportion to your real needs.

Otherwise, it shares the series’ strengths: an electronic board that modulates individually framed elements, an Eco mode, a built-in temperature sensor, two manual-reset thermal cut-outs and a 1/3 HP motor with four speeds, from 800 to 1,000 CFM at 0.5 in w.c. Its continuous heat buttons are published at 2.5 kW minimum and 5 kW maximum.

Example: the owner’s unit in a duplex

In Montreal, many duplex owners live on the ground floor and in the basement, heated by a furnace and ductwork. When that furnace reaches the end of its life, the SFE1821 goes in the same spot: upflow against a wall with zero clearance, or horizontal. For ductwork that runs downward, Stelpro provides the FSB2 adapter, sold separately.

If a central heat pump is added later, the board is already ready. In Type A mode, the factory setting, the heat pump is downstream and the elements stay off during its call. In Type B mode, it is on the return side and the furnace makes up for its loss of capacity in cold weather. The board also compensates during defrost.

Electricity, to check first

Stelpro publishes a total amperage of 75 A at 240 V and 66 A at 208 V, a voltage at which the output drops to 13.2 kW. In an older plex, the capacity of the electrical service deserves a check: it is one of the first things we look at during the estimate.

What AirGreen does

A family business established in Montreal for more than fifteen years, AirGreen holds RBQ licence 5645-9605-01 for ventilation, refrigeration and electrical work. We come to you for a free estimate, then give you a written quote. Our technicians remove the old unit, set the SFE1821 and connect it to the ducts, make the electrical connection according to Stelpro’s manual and the rating plate, then set the motor speed and the 24 V thermostat. Plan for a standard 20 x 20 x 1 in filter, not supplied with the furnace.

Your free estimate

In Montreal, Laval, Longueuil, on the North Shore and the South Shore, ask for your free estimate: we confirm the output, give you a written quote and present the financing available.