Steffes Serenity ETS Furnace (Electric Thermal Storage): How It Works, Benefits & Quebec Grants

If you’re looking to replace an aging oil, propane, or electric furnace in the Montreal area, the Steffes Serenity Electric Thermal Storage (ETS) furnace is one of the most compelling “next-generation” options available, especially when paired with a central heat pump.

At L.E.S Mécanique, we’re an authorized provider/installer of Steffes ETS systems (Serenity) and we install these systems to maximize comfort, reduce peak-hour electricity exposure, and help homeowners capture the available Quebec incentives.

Below, we’ll explain (1) how the Serenity ETS furnace works, (2) why it’s different from a standard electric furnace, and (3) what grants may apply to your project.

What is an ETS furnace?

An ETS (Electric Thermal Storage) furnace is a forced-air central heating system that stores heat in a thermal mass (high-density ceramic bricks), then releases that heat when your home needs it, especially during winter peak demand events. 

An ETS system can be combined with a heat pump to create a high-efficiency, fully electric heating + cooling system, while improving comfort compared with heat-pump-only forced air.

How the Steffes Serenity ETS furnace works

Here’s the core idea:

  1. Charge the heat “battery” off-peak
    During off-peak hours (when electricity rates are typically lower), the Serenity converts electricity into heat and stores it inside ceramic bricks.
  2. Stop heating elements during peak periods
    During peak periods/peak demand events, the furnace is programmed to turn off its electric elements and rely on stored heat instead.
  3. Deliver steady forced-air heat through your ducts
    When your thermostat calls for heat, fans move air across the stored thermal mass and deliver warm air through your existing ductwork.

This is why many homeowners describe ETS heat as feeling more consistent than typical “on/off” electric heating—and why it’s a strong match for Quebec winters.

Why homeowners choose Serenity ETS in Quebec

1) Major incentives can offset the upgrade cost

Hydro-Québec’s LogisVert program offers $15,000 for purchasing and installing an ETS system to replace a central heating unit, and $22,000 when installing an ETS system with a central heat pump.

The incentive can also be deducted directly from the installer’s invoice (meaning you don’t have to wait for a reimbursement).

2) Built for peak events (and designed to work with Flex D)

Hydro-Québec explicitly recommends ETS owners to consider Flex D rate, where winter off-peak pricing applies most of the time, and peak events represent only a small portion of hours.

Hydro-Québec estimates Flex D can save ~$200–$300/year (or more) compared with the base rate, especially when combined with a heat pump.

3) Proven, low-maintenance technology

Steffes Serenity ETS is as proven technology with minimal/easy maintenance and straightforward integration into ducted systems.

4) Lower emissions when replacing fossil heating

The ETS is 100% electric, and Québec electricity is largely clean and renewable—so switching off oil/propane reduces emissions significantly and saves you money.

Grants and incentives for a Steffes Serenity ETS furnace in Quebec

Hydro-Québec LogisVert (ETS incentives)

  • ETS system (stand-alone): $15,000
  • ETS system + central heat pump: $22,000

Eligibility and program rules matter (and can change), but Hydro-Québec outlines key requirements such as being served by a certified Steffes installer, having a forced-air central heating system, and having an easy-to-access basement with a concrete floor.

Our approach: we confirm eligibility early (home + electrical + ducting), then design the system around comfort, performance, and incentive compliance.

Quebec “Chauffez vert” (if you’re removing oil/propane)

If you are converting from oil or propane, the Quebec government’s Chauffez vert program may provide additional support:

  • $1,275 (single-family, oil)

Important timing note: the program is expected to end March 31, 2026, and work must be completed and the application submitted before that date.
(We’ll verify deadlines and the exact steps during your quote, because program timelines and conditions can shift.)

Federal Oil to Heat Pump Affordability (OHPA) — if you’re switching from oil and adding a heat pump

For some households switching from oil to an eligible heat pump, the Government of Canada has offered upfront payments up to $10,000 through OHPA (income-tested; details vary by jurisdiction and program rules).
This is heat-pump focused, but it can be relevant if your ETS installation includes a central heat pump.

Is your home a good fit for a Serenity ETS furnace?

In our experience, Serenity ETS is a great fit when you have:

  • Existing forced-air ductwork (or a plan to add it)
  • A suitable basement mechanical space (ETS units are substantial and are typically installed on a solid floor)
  • Enough electrical capacity (we’ll evaluate your panel/service and any upgrade requirements)
  • A desire for better comfort during cold snaps and peak events
  • Interest in pairing with a central heat pump for year-round heating + cooling

Why install with L.E.S Mécanique

When you install an ETS system, details matter: duct integration, control strategy, electrical capacity, and making sure the design aligns with incentive requirements.

With L.E.S Mécanique you get:

  • Authorized Steffes Serenity ETS installation
  • System design optimized for comfort + peak-event performance
  • Optional central heat pump pairing for efficient heating + A/C
  • Guidance on LogisVert / Flex D alignment and documentation
  • Clean, professional installation standards and clear commissioning

Frequently asked questions (FAQ)

How is Serenity ETS different from a standard electric furnace?

A standard electric furnace creates heat only when the thermostat calls—which can coincide with peak events. Serenity ETS stores heat in ceramic bricks during off-peak periods and can shut off its elements during peak periods while still heating your home.

Do I need a heat pump with Serenity ETS?

Not required—but highly recommended for most homeowners who want cooling and maximum operating savings/comfort. Hydro-Québec specifically outlines the benefits of ETS + heat pump together.

How much are the Hydro-Québec grants?

$15,000 for ETS alone, and $22,000 for ETS + central heat pump under LogisVert.

Can I switch to Flex D after installing?

Hydro-Québec notes Flex D signup is available April 1 to December 31 each year, and it can reduce your bill compared with base rate—especially with ETS (and even more with ETS + heat pump).

Ready for a quote?

If you’re considering a Steffes Serenity ETS furnace installation in Montreal or surrounding areas, we can evaluate your home, confirm eligibility, and propose the right configuration (ETS alone vs ETS + heat pump).

Contact L.E.S Mécanique to schedule an assessment and get a turnkey quote that’s designed around comfort, compliance, and incentives.

Phone: 514-333-6968

Webpage: Contact us

Learn More: ETS Furnace

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