Electric thermal storage: $15,000 or $22,000, taken right off the invoice
A central heating system that charges ceramic bricks when the grid is quiet, then heats the house with that stored heat during peaks. Hydro-Québec pays $15,000 for the thermal storage unit, $22,000 with a central heat pump. And the installer files the claim, not you.
Replaces your central system
24,000 BTU/h minimum
The authorized installer handles it
What your invoice will actually show
The grant is applied after taxes: the installer charges GST and QST on the full price, then takes off Hydro-Québec’s amount. Pick your project, enter your quote, and see the bottom line.
No price is pre-filled: every house is different. Enter your quote total or drag the slider.
Five answers, and we tell you which path to take
Thermal storage is not for every house. Depending on your current heating, your ducts and your basement, the right path may be $22,000, $15,000, or a LogisVert heat pump. Every answer follows the conditions published by Hydro-Québec.
Every kilowatt taken off the peak saves the grid money
When all of Québec heats at the same time, in the morning and late afternoon, Hydro-Québec has to keep up. Cutting that peak lets it avoid or postpone three costs: buying pricier power from neighbouring grids, adding equipment to its plants, building new facilities. The storage unit does exactly that job: it shuts its elements off at the critical hours, every winter day, without you having to think about it.
Source: Hydro-Québec, “Understanding peak periods”.
A winter day, hour by hour
The unit must be programmed so its heating elements do not run from 6 to 10 a.m. and from 4 to 8 p.m., Eastern Standard Time, all year. During those eight hours, the house is heated by the heat held in the bricks. Tap an hour.
Bar height illustrates how much heat is in the bricks. It is a diagram, not a measurement.
Bricks at about 700 °C, and no overheating around them
Tap a number to see each component. Temperatures and safety devices come from Steffes; the components, from the diagram published by Hydro-Québec.
Two Steffes models. Over half a ton of bricks.
Hydro-Québec accepts Steffes model 4120 or 4210 (Serenity), or another equivalent Steffes model it has approved in writing. New, bought in Québec.
Eight conditions for $15,000. One more for $22,000.
The rate that turns the storage unit into savings
On Rate Flex D, electricity costs less than the base rate for over 95% of the winter, and more during peak events. That is exactly when the storage unit shuts its elements off. Hydro-Québec puts the savings at $200 to $300 a year, if not more, compared with Rate D.
Can a peak event fall on that day?
Per Hydro-Québec’s Rate Flex D page. No events on December 24, 25, 26 and 31, January 1 and 2, Good Friday and Easter Monday.
Rate D or Flex D: how much on your winter bill?
Example values: replace them with yours. Your consumption history is in your Hydro-Québec Customer Space. With a storage unit, the elements are already off during events: what remains is the rest of the house.
Prices as of April 1, 2026: Rate D 7.065¢ for the first 40 kWh a day, 11.142¢ above; Flex D in winter 4.886¢ and 9.103¢ outside events, 46.463¢ during events. 121 winter days. The system access charge (46.154¢ a day) is the same and excluded. Indicative.
Six steps. You do three.
Before you sign, tick what your invoice shows
This is the list Hydro-Québec requires from the installer to reimburse it. If a line is missing, the claim can be refused: better to catch it before you pay. The installer also attaches a clear photo of each nameplate.
Two owners, two installs, no programming
What the two owners whose stories Hydro-Québec publishes report. A faithful summary, not a quote.
- Replaced a dual-energy system; removing the oil tank freed space to angle the unit better.
- Kept the standard thermostat, no programming needed.
- The existing heat pump was paired with the new system.
- A bit bigger; he was told not to put anything on top.
- Same comfort. No maintenance since, except changing the filter regularly.
- Installed where the old dual-energy system was, once the oil tank was removed.
- Gives off no excessive heat in the room.
- Kept the thermostat and heat pump, everything works without programming.
- Advice received: have the ducts cleaned and change the filter.
- Considering a Hilo smart thermostat.
Source: testimonials published on Hydro-Québec’s website. Both customers also received Chauffez vert, a program that ended on March 31, 2026. Keeping an existing heat pump limits the grant to $15,000: the $22,000 requires a new central heat pump.
Eight ways to lose $15,000
If you read up on this a few years ago, read it again
Many pages, including Hydro-Québec guides still online, describe the old offer. Toggle to compare.
The dates that changed the picture
The questions we get before people sign
How much will I get, exactly?
$15,000 for a thermal storage unit replacing a central system, $22,000 if combined with a central heat pump. These are fixed amounts, reduced only if the work costs less, before taxes. Hydro-Québec notes that the $15,000 usually covers the extra cost of a storage system compared with a regular forced-air system.
Do I have to fill out a form?
No. For thermal storage, Hydro-Québec says it plainly: there is nothing for you to do. The installer takes the amount off its invoice and gets reimbursed by Hydro-Québec on the LogisVert portal.
Can I also claim the LogisVert heat pump grant?
Not for the same heat pump. In the pair, it is already part of the $22,000, and you cannot file another grant claim for equipment already funded. For comparison, a 3-ton MIDEA EVOX G3 alone earns $3,960; in the pair, the heat pump lifts the grant from $15,000 to $22,000.
I have an oil furnace. Is this for me?
Often, yes, if it is forced air. Since December 31, 2023, it can no longer be replaced with an oil appliance in an existing home. Thermal storage is 100% electric. Note: Chauffez vert, Québec’s grant for that kind of conversion, ended on March 31, 2026.
Why is a concrete floor required?
Because of the weight. A Serenity 4210 weighs about 1,536 lb once installed, including about 1,116 lb of bricks. A full Comfort Plus 4120 weighs about 2,170 lb.
How long does the installation take?
In the two testimonials Hydro-Québec publishes: a day and a half, and two days. The longest part is often freeing up the space, for example by removing an old oil tank.
Can I keep my thermostat and heat pump?
Both owners Hydro-Québec quotes kept their standard thermostat and their heat pump, with no programming. But note: with an existing heat pump, the grant is $15,000. The $22,000 requires a new central heat pump of 24,000 BTU/h or more.
Is my electrical panel big enough?
To be checked on site. Steffes’ spec sheet lists a minimum circuit ampacity of 91.5 A for the Serenity 4210, i.e. two 60 A circuits and one 15 A. For the Comfort Plus 4120: 109 A (19.2 kW) or 138 A (24.8 kW).
Is it noisy? Will the room overheat?
According to Hydro-Québec, the noise is similar to a dual-energy or oil system, and there is no overheating around the unit despite the high brick temperature. It connects to existing ductwork.
Do I have to switch to Rate Flex D?
No, it is optional. But without Flex D, you miss out on the lower winter prices. Hydro-Québec recommends it to every storage unit owner.
After an outage, the clock is off.
The clock usually holds, but an outage of several days may require resetting. Always set it to Eastern Standard Time, even in summer. Hydro-Québec publishes resetting instructions.
Is there a version for hot-water heating?
Hydronic storage units exist, but they are not sold in Québec for now. The grant targets central forced-air systems.
What is the warranty?
Steffes’ Serenity spec sheet lists a 5-year limited parts warranty. Hydro-Québec does not warrant the unit or the installation.
What about the winter credit option?
It is Hydro-Québec’s other formula: you stay on Rate D and get a credit of 58.490¢ per kilowatt-hour curtailed during events, compared with a reference consumption. It cannot be combined with Rate Flex D, which requires no other rate option. For a storage unit, Hydro-Québec recommends Flex D.
Can the grant exceed the price?
No. Per the installer guide, it cannot exceed 100% of the sale and installation cost, before taxes. And no tax applies to the grant amount.
Can the program change?
Yes. Hydro-Québec states it can end or change the program at any time, without notice. The amounts on this page are those of September 22, 2026.
Someone is calling me on Hydro-Québec’s behalf.
Be careful. Hydro-Québec does no phone or door-to-door solicitation for LogisVert. Program support: 1 833 396-1888 or info@logisvert.ca, Monday to Friday, 8 a.m. to 8 p.m.
We assess the house, size the heat pump, and tell you the truth about the grant.
Steffes authorization: in progress. For the grant to come off the invoice, the storage unit must be installed by a Steffes-authorized company. Our authorization is in progress. We tell you where it stands at the assessment, before anything is signed.
Hydro-Québec does no phone or door-to-door solicitation for LogisVert. An unsolicited offer in Hydro-Québec’s name is probably a scam. LogisVert program: info@logisvert.ca · 1 833 396-1888, Monday to Friday, 8 a.m. to 8 p.m.
Sources checked on September 22, 2026. Hydro-Québec, LogisVert program, installers (French) and participation guide v1.6 of September 15, 2026; LogisVert residential page and guide v1.10 of September 15, 2026; Central heating with thermal storage (financial assistance, advantages, FAQ); list of Steffes-authorized companies (April 2026); Steffes Serenity 4210 and Comfort Plus 4120 spec sheets published by Hydro-Québec; Rate Flex D; Electricity Rates effective April 1, 2026 (Rate D, Rate Flex D, winter credit option); “Understanding peak periods”; customer testimonials; former offer guide (2021G920F, August 2022). Steffes, forced-air thermal storage furnace page (brick temperature, safety, warranty). Gouvernement du Québec: Chauffez vert program (ended March 31, 2026) and the regulation on oil-fired heating appliances. MIDEA EVOX G3 LogisVert amounts per Hydro-Québec’s list of eligible heat pumps (AHRI 215471340, 215471343, 215471344). Invoice and rate calculations are indicative (GST 5%, QST 9.975%); only Hydro-Québec confirms the grant awarded. Hydro-Québec may change or end the program at any time.