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Updated October 28, 2026

LENNOX electric furnace: an air handler and its heating element.

LENNOX calls it an “air handler”: the MMD on R-32, matched with an MMLD or MMPD, and the Merit-series CBA25UH on R-410A. Backup heat comes from an element installed on site, from 3 to 20 kW depending on the unit. Pick the family and the size: we show the elements LENNOX allows and the circuit they need.

See the allowed elementsBook my free estimate
15units in our catalogue8 MMD · 7 CBA25UH
3 to 20 kWheating elements LENNOX allowsForms 211233 and 211248
12 yearsMMD parts in Québec, no registrationEW900011-01
10 yearsCBA25UH parts in QuébecW900000-02 + EW900012-01
The shop

The 15 units, right below

MMD on R-32 and Merit-series CBA25UH, from 1 to 5 tons. The heating element is chosen with the unit.

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01 · The allowed heating element

Your unit, your size: the heating elements LENNOX allows

From the LENNOX forms: catalogue number, output, and for the single-zone MMD, the minimum circuit amperage and maximum protection at 208 and 230 V. The output to install is decided at the visit.

Unit
Size
This unitMMD036S6R-32 · single zone · 3 tons
MatchesMMLD036 (AHRI 216581334) or MMPD036 (AHRI 216581339)
LENNOX warranty in Québec12 years parts; V1EHK element: 5 years, no extension

Open the MMD036S6 page

MCA: minimum circuit amperage. MOP: maximum overcurrent protection, fuse or breaker. S6 or M6: the letter after the size says which outdoor unit it connects to, single zone (S) or multi-zone (M).

MMD036S6 · 3 tons

10kW at most

Three elements allowed on this size: 3, 5 and 10 kW. The element is installed on site, inside the cabinet.

3 kWV1EHK09-1P · cat. 39J81 · MCA 18.23 / 20.39 A · MOP 20 / 20 A
5 kWV1EHK03-1P · cat. 38V04 · MCA 27.26 / 30.37 A · MOP 30 / 35 A
10 kWV1EHK04-1P · cat. 38V05 · MCA 49.83 / 55.33 A · MOP 50 / 60 A

MCA and MOP printed by LENNOX for each element, at 208 / 230 V.

02 · The closest sibling

MMD or CBA25UH: two ways to replace an electric furnace

The MMD goes with the R-32 MMLD and MMPD outdoor units; the CBA25UH, with the R-410A Merit. At the same size, here is what LENNOX publishes for each.

Size compared
MMD036S6R-32 · single zone
CBA25UH-036R-410A · Merit
RefrigerantR-32
RefrigerantR-410A
MatchesMMLD036 or MMPD036
MatchesMerit ML14XP1-036, most popular match
Heating elements allowed3, 5 and 10 kW
Heating elements allowed4 to 15 kW (ECB45)
Published airflow1,229 / 1,074 / 901 cfm (high, medium, low)
Published airflowUp to 1,523 cfm, by speed and pressure
Static pressureUp to 1.0 in. w.g.
Static pressureAirflow table published from 0.10 to 0.50 in. w.g.
PositionsUpflow, downflow, horizontal
PositionsUpflow, horizontal; downflow with a kit
DownflowVDK-2W (30L85) kit; element allowed since Sept. 2026
DownflowY9659 kit
LENNOX warranty in Québec12 years parts (EW900011-01)
LENNOX warranty in Québec10 years parts (W900000-02 and EW900012-01)

Both take the place of an electric furnace; here is what changes. LENNOX forms 211233 (Sept. 2026) and 211248 (April 2026), ML14XP1 bulletin 210761; LENNOX warranty certificates.

03 · Did you know

Three things the LENNOX documents say about these units

Air handler

LENNOX doesn’t call the MMD a furnace

Its form calls it the “MMD Air Handler”, a multi-position air handler. Backup heat comes from an optional electric element, installed on site inside the cabinet.

LENNOX, form 211233 (Sept. 2026), p. 1-4.
Sept. 2026

Downflow with an element: allowed since September 2026

The September 2026 revision of the MMD form removes the limit on the downflow conversion kit: the heating element can now be used when the unit blows downward.

LENNOX, form 211233, Sept. 2026 revision.
Canada

The CBA25UH is sold in Canada for new installations

LENNOX spells it out: in Canada, for system installation and replacement; in the United States, for repair or replacement only.

LENNOX, form 211248 (March 2025 and April 2026).
04 · The technician’s corner

Installation numbers, unit by unit

LENNOX forms 211233 and 211087 (Sept. 2026) for the MMD, 211248 (April 2026) for the CBA25UH. MMD airflow: high, medium, low.

ModelRefrigerantAirflowStatic pressureElementsDownflow
MMD018S6R-32636 / 583 / 477 cfm0 to 0.8 in. w.g.3 and 5 kWVDK-2W (30L85)
MMD024S6R-32706 / 636 / 530 cfm0 to 0.8 in. w.g.3 and 5 kWVDK-2W (30L85)
MMD030S6R-321,007 / 918 / 848 cfm0 to 1.0 in. w.g.3, 5 and 10 kWVDK-2W (30L85)
MMD036S6R-321,229 / 1,074 / 901 cfm0 to 1.0 in. w.g.3, 5 and 10 kWVDK-2W (30L85)
MMD048S6R-321,494 / 1,388 / 1,257 cfm0 to 1.0 in. w.g.5, 10 and 15 kWVDK-3W (30L86)
MMD012M6R-32375 / 286 / 244 cfm0.10 to 0.51 in. w.g.3 kWNot stated
MMD018M6R-32600 / 530 / 495 cfm0.10 to 0.59 in. w.g.3 and 5 kWNot stated
MMD024M6R-32760 / 636 / 548 cfm0.10 to 0.59 in. w.g.3 and 5 kWNot stated
CBA25UH-018R-410Aup to 920 cfmTable 0.10 to 0.50 in. w.g.4 to 10 kWY9658
CBA25UH-024R-410Aup to 1,054 cfmTable 0.10 to 0.50 in. w.g.4 to 10 kWY9658
CBA25UH-030R-410Aup to 1,341 cfmTable 0.10 to 0.50 in. w.g.4 to 15 kWY9659
CBA25UH-036R-410Aup to 1,523 cfmTable 0.10 to 0.50 in. w.g.4 to 15 kWY9659
CBA25UH-042R-410Aup to 1,656 cfmTable 0.10 to 0.50 in. w.g.4 to 15 kWY9659
CBA25UH-048R-410Aup to 1,899 cfmTable 0.10 to 0.90 in. w.g.4 to 20 kWY9659
CBA25UH-060R-410Aup to 2,010 cfmTable 0.10 to 0.90 in. w.g.4 to 20 kWY9659

MMD M6

Multi-zone only: connects to the MMLD S6M multi-zone units (1.5 to 3 tons) and mounts at least 0.6 m (1.97 ft) off the floor. For a single zone, it is the MMD S6.

CBA25UH

Airflow measured from 0.10 to 0.50 in. w.g. (0.90 for 4 and 5 tons), dry coil and 1-inch filter in place. Allow 24 in. of clearance to remove the filter, coil or blower. Expansion valve factory installed.

MMD: controls

Wireless remote, LENNOX wall controls, or the VSTAT09P-1 adaptor so a 24 V thermostat runs the unit (transformer supplied on site).

CBA25UH installation instructions 507751-03 (Jan. 2025); LENNOX multi-zone MMD installation manual (Jan. 2025); MMLD multi-zone form 211075 (July 2026).

05 · Questions

What people ask us about LENNOX electric furnaces

Electric furnace or air handler?

It is the same unit. We say electric furnace because that is what people search for; LENNOX says “air handler”. Backup heat comes from the electric element installed inside the cabinet.

MMD S6 or M6: which one?

The letter after the size says which outdoor unit it connects to. S6: single zone, with a single-zone MMLD or MMPD. M6: multi-zone, only with an MMLD S6M multi-zone unit. At the visit, we start from the outdoor unit you will have.

Can I keep my thermostat?

With the MMD, yes if it is a 24 V thermostat: the LENNOX VSTAT09P-1 adaptor lets it run the unit, with a transformer supplied on site. Otherwise: wireless remote or LENNOX wall controls.

Can the unit go horizontal or downflow?

The MMD installs upflow, downflow or horizontal; downflow uses the VDK-2W or VDK-3W kit, and the heating element is allowed there since September 2026. The CBA25UH ships upflow and horizontal; downflow uses the Y9658 or Y9659 kit.

Does the electric furnace qualify for LogisVert?

Not on its own. LogisVert targets the heat pump, and the amount is based on the system’s certified heat, outdoor and indoor together. An MMD matched with an MMLD or MMPD forms a certified system: see the LENNOX central heat pumps page. Only Hydro-Québec confirms the assistance granted.

Who wires the heating element?

AirGreen, which holds RBQ subclass 16 (electrical) along with 15.8 and 15.10. Wire, fuse and disconnect sizes follow the Canadian Electrical Code, as LENNOX asks.

What about the warranty in Québec?

MMD: 5 years basic, extended to 12 years on parts in Québec without registration (EW900011-01); the V1EHK element stays on the basic warranty. CBA25UH: 5 years on parts, plus 5 years by default in Québec (W900000-02 and EW900012-01). LENNOX does not cover labour.

Which size and which element for my house?

We don’t guess them over the phone. We come and look at the house, the ducts, the location and the electrical panel, then we suggest the unit and the element. The estimate is free.

Sold and installed by AirGreen

Your LENNOX air handler, with the right element, installed by AirGreen.

We come and see the location, the ducts and the panel, choose the unit and the heating element with you, and the quote says which LENNOX outdoor unit it matches.

Book my free estimate514 316-2973
RBQ 5645-9605-01Subclasses 15.8, 15.10 and 16. Gas and oil: a licensed partner.
Free estimateAt your home, no obligation.
LogisVert on the quoteAHRI number and indicative amount when the unit qualifies.
Showroom1370 Joliot-Curie Street, Suite 712, Boucherville.

Hydro-Québec does not solicit anyone by phone or door to door for LogisVert. A call “from Hydro-Québec” selling a heat pump? Hang up.

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Sources checked October 28, 2026

  1. LENNOX, single-zone “MMD Air Handler” form 211233 (September 2026): name, positions, airflow, static pressure, sound, V1EHK elements, MCA and MOP, controls, revision.
  2. LENNOX, multi-zone MMD form 211087 (September 2026); MMLD multi-zone form 211075 (July 2026); multi-zone MMD installation manual (January 2025).
  3. LENNOX, CBA25UH air handler forms 211248 (April 2026 and March 2025): airflow, ECB45 kits, positions, sale in Canada; installation instructions 507751-03 (January 2025); electric heat bulletin 210617 (January 2025).
  4. LENNOX, MMLD 211076 and MMPD 211078 forms (December 2025): AHRI systems with the MMD; ML14XP1 bulletin 210761 (November 2020): match with the CBA25UH.
  5. LENNOX, warranties W900004-02 (November 11, 2025), EW900011-01 (January 1, 2026), W900000-02 (September 1, 2026) and EW900012-01 (January 1, 2026).
  6. ENERGY STAR, Certified Air-Source Heat Pumps (dataset w7cv-9xjt), updated October 28, 2026: ML17XP1-018 + CBA25UH-018 combination (AHRI 210039087).
  7. Hydro-Québec, LogisVert residential participation guide, version 1.10, September 15, 2026.
  8. OQLF (Québec’s official French-language office), Grand dictionnaire terminologique, “air handler” record (updated 2010).
  9. Régie du bâtiment du Québec, licence subclasses 15.8, 15.10 and 16.0, checked October 28, 2026.

LogisVert amounts are indicative: only Hydro-Québec confirms the assistance granted. Price on quote. Free in-home estimate.