Heat pumps and heating
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MERV 8, 11 or 13 depending on the size.
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Storage up to120 kWh
Output up to24.8 kW
Warranty10 years
Rebate up to$22,000
The Steffes Serenity electric thermal storage system seamlessly combines forced air heating with advanced heat-storage technology, delivering steady, reliable comfort throughout your home.
Steffes’ heat storage electric central heating systems stand out for their improved energy efficiency, exploiting electricity consumption during off-peak hours, billed at a more advantageous rate due to low demand on the electricity network . This technology transforms off-peak electricity into heat uniquely stored in heating elements housed within high-density ceramic bricks.
The exceptional capacities of Steffes thermal storage systems make it possible to store significant quantities of heat for long periods. This means you can benefit from optimal performance during peak periods at a cost closer to that of off-peak hours. These capabilities offer the opportunity to make substantial savings, ranging from 20 to 30% on heating bills, while maintaining your comfort and maintaining the convenience of a traditional heating system. Thermal storage electric central heating solutions have the advantage of not producing carbon monoxide and require minimal maintenance, guaranteeing unrivaled reliability.
16 kW
14.0 kW
19.2 kW
24.8 kW
Both units store off-peak heat in ceramic bricks and distribute it through the ducts with a variable-speed fan. They can work alone or with a central heat pump. The details of each output are in the Brochure tab.
Swipe the table to see both models
| Series | SteffesSerenity 4210 | SteffesComfort Plus 4120 |
|---|---|---|
| Element output | 16 kW | 14, 19.2 or 24.8 kW |
| Storage | 80 kWh | 120 kWh |
| Fan | Variable speed, 1/2 HP | Variable speed, 1/2 or 3/4 HP |
| Installed weight | 1,536 lb | 2,267 lb |
| LogisVert rebate | $15,000 · $22,000 with a central heat pump | $15,000 · $22,000 with a central heat pump |
| Warranty | 10 years, labour 10 years | 10 years, labour 10 years |
| Ideal for | Small homes: it is Steffes’ most compact forced-air storage system. | Larger homes, according to Steffes, with three outputs to choose from. |
The Steffes Comfort Plus heating system stores electricity generated off-peak as heat. Off-peak electricity is available at times of the day or night when this energy is abundant and the associated costs are low.
During off-peak periods, electricity is converted into heat, which is then stored in the system’s ceramic brick mass. The amount of thermal energy stored in the storage mass varies depending on the outdoor temperature, the electricity supplier’s peak conditions and the heating requirements. The system’s fans are activated by a call for heat from the room thermostat.
The variable-speed exhaust fan automatically adjusts its speed to circulate room air through its core. The supply fan then transports this heated air through the ventilation ducts and to the desired space to maintain a constant, comfortable temperature in the room. The system’s versatility allows it to adapt to a variety of applications. It is designed to be used as a sole heat source (stand-alone furnace) or as a complement to other ducted heating systems such as heat pumps.
The Serenity system can integrate with a backup generator, ensuring its operation during power outages. This capability strengthens the resilience of your home by maintaining essential heating systems, providing comfort and peace of mind during extended interruptions. The generator helps distribute the heat stored by the unit throughout the home, ensuring consistent heat.
The era is green, and the central heating system with heat storage is an ideal solution for homeowners concerned about obtaining the best energy savings and wishing to replace their fossil fuel system with equipment powered by electricity. Because the electricity produced in Quebec is clean and 99% renewable, installing a heat storage system also means participating in the protection of the environment and the reduction of greenhouse gases.
Have questions about the Steffes Serenity electric thermal storage system? Our certified experts are here to help. We’ll guide you toward the best solution for your home.
The Steffes Serenity ETS system combines forced air heating with electric thermal storage technology, guaranteeing reliable and constant heat in every corner of your home. Designed specifically to replace existing oil, gas or electric heating systems, the Serenity generator stands out for its remarkable efficiency. By optimizing the use of low-cost electricity outside peak times, it gives you an economical and comfortable heating solution.
The Serenity forced air hot air generator from Steffes offers the following advantages for heating your home:
The Flex D rate offers increased savings potential thanks to its dynamic pricing
During the winter season, it offers more advantageous rates than the base rate, with the exception of peak periods, when prices are adjusted upwards.
The FLEX D RATE is different from the base rate D RATE. It applies as follows:
In winter, outside peak events: the price of electricity is approximately 30% lower than the base rate for the first 40 kWh per day (4.886¢/kWh instead of 7.065¢, prices as of April 1, 2026). Interesting savings can be made;
During peak events: electricity is billed at a high price (46.463¢/kWh as of April 1, 2026). It is then necessary to shift consumption which is not essential or limit it to minimize costs. The day before a peak event, you receive an email notification and, if you wish, a notification.
The rest of the year: Rate D prices (basic rate) apply.
Peak events can take place every day of the week, 6 a.m. to 10 a.m. and 4 p.m. to 8 p.m., from December 1 to March 31, for a maximum of 120 hours per winter.
Depending on your energy consumption habits, it is possible that your bill will be higher with the Flex D rate than with the base rate if you do not take the necessary measures during peak events, because the price is higher. It is therefore important to consume as little electricity as possible and to be careful during these events to avoid being penalized.
Winter runs from December 1 to March 31. With Rate Flex D, the storage system stores heat at the reduced price and stops heating its bricks during peak events: the house stays heated by the stored heat.
| Energy price | Rate Dbase rate | Rate Flex Ddynamic rate |
|---|---|---|
| Winter, first 40 kWh per day | 7.065 ¢/kWh | 4.886 ¢/kWh, outside peak events |
| Winter, remaining energy | 11.142 ¢/kWh | 9.103 ¢/kWh, outside peak events |
| During a peak event | Rate D price | 46.463 ¢/kWh |
| Peak events | — | Every day, 6 a.m. to 10 a.m. and 4 p.m. to 8 p.m., 120 hours at most per winter |
| The rest of the year | Rate D price | Rate D price |
| System access charge | 46.154 ¢ per day | 46.154 ¢ per day |
Hydro-Québec electricity rates as of April 1, 2026 and Rate Flex D page (consulted on October 12, 2026). Prices change every April 1.
Central heating technology with heat storage, relatively unknown in Quebec, is already widely used in regions where dynamic pricing has been in effect for several years.
Starting in April 2023, Hydro-Québec is offering a subsidy of $15,000 to customers wishing to install a central heating system with a heat accumulator.
In addition, you benefit from additional financial assistance of $7,000 by opting for the simultaneous installation of an efficient central heat pump in addition to your heat accumulator.
Les Entreprises MPH is on the list of authorized Steffes companies published by Hydro-Québec (April 2026): you have nothing to do, the rebate amount is deducted directly from our invoice.
Hydro-Québec’s LogisVert program: “Residential customers” page and Participation guide for installation companies (version 1.6, September 15, 2026).
1. High density heat storage bricks
2. Electric heating elements
3. Programmable microprocessor control panel and digital display
4. Built-in circuit breakers for power cutoff
5. Central fan
6. Air handling unit with variable speed fan
7. Air conditioning or heat pump coil (must be provided by the installer)
8. Return air plenum (ordered separately or supplied by installer)
9. Air filter
10. Supply air plenum (ordered separately or supplied by installer)
1.The house thermostat is set to the desired temperature. If the room temperature drops below the thermostat set point, the system is activated to provide heat.
2. When the thermostat calls for heat, the heat pump’s external compressor is energized and heats the coil in the accumulator return air duct. At the same time, the Serenity fan is powered.
3. The fan draws air from the house (rated at 68°F) through the air filter and the heat pump coil extracting heat from the coil as it passes through it.
4. An electronic sensor monitors the air temperature past the heat pump coil. If the air temperature is warm enough to provide comfort (usually 90°F or higher), the fan simply transmits heat into the house through the ventilation ducts. The air temperature after the coil in the diagram is shown as 85°F.
5. If the air temperature past the heat pump coil is below a comfortable level (typically below 90°F), the Serenity’s central fan will modulate the low-cost “off-peak” stored heat in the ventilation ducts to comfortable heat (usually 90°F). or higher).
6. Since heat pumps typically have an operating efficiency of 150% to 300% or more (depending on the outside temperature), the Serenity system first uses the heating capacity offered by the heat pump.
7. If the heat pump does not have the capacity to meet comfort requirements, the Serenity system begins operating with the heat pump using low-cost off-peak energy to ensure user comfort at all times. Combining the efficiency of the heat pump with the Serenity “Off-Peak” system provides very low operating costs for the end user as well as great comfort.
Heat pumps are one of the most efficient heating and cooling methods. Using a Steffes Serenity heat store with a heat pump combines the high efficiency of the heat pump with off-peak electricity rates, making this heating and cooling system the lowest cost option lowest exploitation.
In heat pump applications, the Serenity heat store replaces electrical element heat, which is typically needed to supplement the heat pump, with low-cost stored heat during off-peak hours. As outdoor temperatures decrease, the heat stored in the heat accumulator is used in conjunction with the heating capacity of the heat pump to meet comfort requirements. During peak hours or when heat demand reaches a point where the heat pump alone cannot meet heating needs, stored heat is used to supplement the heat pump.
Not sure if the Steffes Serenity electric thermal storage system is right for your home? Our team will be happy to guide you.
The Serenity and Comfort Plus storage systems we install are covered by a 10-year warranty. Labour is guaranteed for 10 years.
Steffes states that its forced-air storage systems require no routine maintenance. A few simple habits keep the whole system efficient.
The Serenity 4210 is Steffes’ most compact forced-air storage system: 16 kW of elements and 80 kWh of storage in 72 ceramic bricks, for small homes. The Comfort Plus 4120 stores 120 kWh and comes in 14, 19.2 and 24.8 kW, for larger homes. During the free estimate, an advisor assesses your home’s heat loss and recommends the model.
Hydro-Québec’s LogisVert program grants $15,000 for a Steffes 4120 or 4210 (Serenity) storage system, and $22,000 when it is combined with a central heat pump of at least 24,000 BTU/h. Les Entreprises MPH is on the list of authorized Steffes companies: the amount is deducted directly from our invoice. The rebate is granted only once per dwelling.
During off-peak hours, electricity heats ceramic bricks to about 700 °C, according to Steffes. When the thermostat calls for heat, the fan moves the house air through the bricks and pushes it into the ducts. For the rebate, the elements are programmed not to heat from 6 a.m. to 10 a.m. and from 4 p.m. to 8 p.m.
Steffes recommends it to achieve significant savings. With Rate Flex D, electricity costs 4.886 ¢/kWh in winter for the first 40 kWh per day, instead of 7.065 ¢ with Rate D, but 46.463 ¢/kWh during peak events (up to 120 hours per winter, every day from 6 a.m. to 10 a.m. and from 4 p.m. to 8 p.m.). The storage system then heats the house with the stored heat. Prices as of April 1, 2026.
The storage system is designed to accept a connection to a generator. The heat stored in the bricks then only needs power for the fan to heat your home.
The Serenity and Comfort Plus storage systems we install are covered by a 10-year warranty. Labour is guaranteed for 10 years.
The price depends on the model, the output and your ducts; the $15,000 or $22,000 rebate is deducted from it. Ask for a free estimate: an advisor recommends the right solution, with no commitment.
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The two models eligible for the LogisVert rebate, output by output, from the Steffes brochures.
| Model | 16 kW |
|---|---|
| Charge input (elements) | 16.0 kW |
| Heating elements | 8 |
| Element voltage | 240 V |
| Storage capacity | 80 kWh (284,300 BTU) |
| Ceramic bricks | 72, about 1,116 lb |
| Fan | Variable speed, 1/2 HP |
| Circuits required | 2 × 60 A and 1 × 15 A |
| Dimensions, blower included (W × D × H) | 43 × 44 × 47 in. |
| Approximate installed weight | 1,536 lb |
| LogisVert | $15,000 |
| Model | 14.0 kW | 19.2 kW | 24.8 kW |
|---|---|---|---|
| Charge input (elements) | 14.0 kW | 19.2 kW | 24.8 kW |
| Element current | 59 A | 80 A | 104 A |
| Circuits required (elements) | 1 × 20 A and 2 × 30 A | 1 × 30 A and 2 × 40 A | 1 × 40 A and 2 × 50 A |
| Fan and control circuit | 1 × 15 A | 1 × 15 A | 1 × 15 A |
| Storage capacity | 120 kWh (409,440 BTU) | 120 kWh (409,440 BTU) | 120 kWh (409,440 BTU) |
| Heat delivered, 8 h of charge | 20,414 BTU/h | 27,996 BTU/h | 34,175 BTU/h |
| Heat delivered, 12 h of charge | 30,621 BTU/h | 41,994 BTU/h | 45,566 BTU/h |
| Fan (your choice) | 1/2 HP: 1,000 to 1,600 CFM · 3/4 HP: 1,200 to 2,000 CFM | 1/2 HP: 1,000 to 1,600 CFM · 3/4 HP: 1,200 to 2,000 CFM | 1/2 HP: 1,000 to 1,600 CFM · 3/4 HP: 1,200 to 2,000 CFM |
| Dimensions without ducts (W × D × H) | 29.2 × 47.4 × 46.6 in. | 29.2 × 47.4 × 46.6 in. | 29.2 × 47.4 × 46.6 in. |
| Approximate installed weight | 2,267 lb | 2,267 lb | 2,267 lb |
| LogisVert | $15,000 | $15,000 | $15,000 |
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