Enerzone Harmony 2.3 Size Guide

The Harmony 2.3 is the design-forward variant of the Solution 2.3, rated for the same 500 to 2,100 square feet heating area and producing the same 75,000 BTU/h maximum heat output. The Harmony is the right choice when the stove is a visible focal point in the room and the heavier construction, cast iron door frame, and optional decorative overlay panels add value beyond raw heating capacity.

• Primary heating for 1,200-2,100 sq ft homes where the stove is visible. Living rooms, great rooms, open-plan kitchens — anywhere the stove's presence in the room matters.
• Buyers who want a heavier, more substantial build. The Harmony ships at 435 lb (33 lb heavier than the Solution 2.3) with more material in the firebox surround, cast iron door frame, and decorative panel assembly.
• Design-conscious installations. The optional black steel or brushed nickel door overlay panels give the Harmony a more finished aesthetic than the plainer Solution face.
• Long burn time priority. 8-hour max burn (tied with the Solution 2.3 for the longest in the lineup) supports overnight primary heating.
• Manufactured homes 1,500-2,100 sq ft. Mobile home approved with the AC01316 outside air kit.
• Buyers who want the optional refractory panel upgrade. The AC01236 kit replaces standard firebricks with five moulded refractory stones for higher burn temperatures — a premium upgrade path unique to the Harmony.

• Spaces under 1,000 sq ft. Too much heat capacity. Choose the Solution 1.4 or Solution 1.7.
• Spaces over 2,100 sq ft. Beyond rated capacity. Step up to the Solution 3.5.
• Buyers wanting Solution 2.3 performance at a lower price. The Solution 2.3 delivers identical heating performance — choose it if aesthetics matter less than budget.
• Installations where the stove will be hidden or in a utility location. Basements, mechanical rooms, garages — the Harmony's premium aesthetic adds no value if no one sees it.
• Tight side-wall installations. The Harmony requires 22 inches of side-wall clearance — the largest in the Solution/Harmony lineup. Verify before committing.
• Buyers seeking a catalytic stove. The Harmony 2.3 is non-catalytic — same combustion technology as the Solution series. If you specifically want a catalytic stove with longer burn times, the Enerzone lineup is not the right brand for you.

Both stoves use identical non-catalytic combustion technology, produce identical BTU output (75,000 BTU/h), cover identical heating area (500-2,100 sq ft), and carry the same 8-hour maximum burn time. The Harmony's higher price reflects build quality and aesthetics — not different heating performance.

The 33-pound shipping-weight difference comes from heavier construction in several places: a more substantial cast iron door frame, the decorative panel assembly (SE65114), the Air-Mate convector shroud that is standard on the Harmony, and additional material throughout the surround. The carbon steel body is the same as the Solution — the construction additions are around it.

The Harmony's most distinctive visual feature is the optional decorative door overlay — a trim plate that mounts to the door front, available in two finishes:

• AC01232 — Black steel overlay. Matches the cast iron door frame in a uniform black finish.
• AC01233 — Brushed nickel plated steel overlay. Contrasts the black cast iron frame with a brushed nickel accent.

The overlay panel is sold separately and installs to an unmodified Harmony 2.3 door. The Solution 2.3 face does not accept these overlays — the Solution's door has a different geometry.

The Harmony offers an upgrade kit (AC01236) that replaces the standard firebricks with five moulded refractory stones (left side, right side, left back, right back, bottom). The refractory stones boost firebox temperatures and improve secondary combustion efficiency. This upgrade is not available for the Solution 2.3 — it requires the Harmony's specific firebox geometry.

Verdicts below assume 8-foot ceilings and average insulation. The Harmony 2.3 covers the same heating area as the Solution 2.3 (500-2,100 sq ft) with the same sweet spot around 1,500-1,800 sq ft.

• 9-foot ceilings: Reduce target by 10%.
• 10-foot or vaulted ceilings: Reduce by 20%.
• Open second floor or loft: Add 50% of upper-floor square footage to your target.
• Older construction with limited insulation: Reduce target by 25%.
• Drafty cabins: Reduce by 25-30%.

All values below are for US installations, sourced from the Enerzone Harmony 2.3 installation manual (EB00045, December 2024). Canadian clearances differ — notably, the Canadian single-wall back clearance is 14½″ versus 11″ in the US. Always verify against the certification label affixed to your stove.

• 16 inches in front of the door opening
• 8 inches on each side of the door opening
• Materials: steel (≥0.015″ thick), grouted ceramic tile on cement board, brick, or any listed floor protection product. No R-factor required.
• Under horizontal connector pipe: floor protection must extend at least 2 inches past each side of the pipe.
• Non-combustible floor (concrete slab): No additional floor protection required.

• Chimney standard: UL 103 HT (US, 2100°F) or ULC S629 (Canada).
• Chimney diameter: 6 inches throughout. 5″ (Canada only) or up to 7″ permitted if verified by a qualified installer.
• Minimum chimney height: 12 feet total from stove top to chimney top.
• Flue outlet: Top exit only. Offset 6½″ from rear, 12⅞″ from side.
• Connector pipe: Black painted only — no galvanized pipe. Maximum horizontal run 10 feet including elbows; maximum two 90° elbows.
• Chimney height above roof: At least 3 feet above the point where it passes through the roof, and 2 feet above any object within 10 feet horizontally.

The Enerzone Harmony 2.3 installation manual confirms mobile home approval (Section 6.1 and Section 7.2.5). The Harmony pairs the same mobile home certification as the Solution series with a more premium aesthetic — useful for buyers whose manufactured home interior is design-conscious and the stove will be a visible focal point.

• Outside air intake kit. Required. Enerzone AC01316 — 5″ Ø Fresh Air Intake Kit for the legs version of the Harmony.
• Insulated fresh air intake pipe. HVAC-type insulated pipe meeting ULC S110 or UL 181 Class 0 or Class 1. Air must be drawn from a ventilated crawl space or directly outdoors — never from an attic, basement, garage, or other enclosed space.
• Double-wall connector pipe only. Single-wall pipe is strictly forbidden in mobile homes.
• Factory-built chimney. ULC S629 / UL 103 HT (2100°F) rated, 6″ double-wall, with a total flue length of at least 12 feet from the stove top.
• Bolt-down to structure. The Harmony must be attached to the structure of the mobile home. Structural integrity of floor, wall, ceiling, and roof must be maintained throughout the install.
• Installation in sleeping room prohibited. Per HUD compliance.
• Podium requirements. The stove must sit on a podium maximum 30″ × 24″, minimum 2″ high. Combustible podiums are permitted only if covered with non-combustible material.

The Harmony 2.3 loads logs east-west — sides of the logs facing the door. The firebox is wider than it is deep, so logs lie left-to-right across the firebox width. This matches the Solution 2.3 loading pattern.

Practical implication: cut firewood to 16-20 inches. The Harmony's interior firebox width is 21 inches — logs should be cut at least 1 inch shorter for easy loading. Most cordwood delivery is in 16-20″ rounds, which fits without resawing.

• Bottom layer: 3 logs east-west on the coal bed, with 1-2″ air space between each log and 1-2″ from the rear firebrick.
• Top layer: 2 logs stacked on top, angled at roughly 20° (for high burn) or flat (for low/overnight burn).
• High burn rate: Largest log on top-front. Air control fully open.
• Low/overnight burn rate: Smallest log on top-back. Run at high burn 10-15 minutes, then close the air control fully.
• Always maintain air space between logs and around the perimeter for secondary combustion.
• Log retainers: Keep logs at least 2 inches from the front of the firebox.

• Hardwoods for sustained heat and overnight burns: oak, maple, ash, beech, hickory. Highest BTU per cord, slowest burn rate.
• Softwoods for kindling and shoulder seasons: spruce, birch, poplar, pine. Use for fire starting and milder days.
• Target moisture content: 15-20%. Per the Harmony manual, this range is required for the emission-control technologies to work properly.
• Manufacturer note: wood species is less important than moisture content. Use whatever local hardwood you can source dry.
• Season wood at least one year in a covered, ventilated stack.
• Prohibited fuels: coal, garbage, yard waste, rubber/tires, plastics, painted or treated wood, asbestos, demolition debris, railroad ties, manure, salt-water driftwood, unseasoned wood, paper, cardboard, plywood, particleboard.