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G-017 · REV 2 · CHECKED 2026-10-09 · MODEL v1.0.2 ▾

Drafted with AI assistance. Numbers computed by model v1.0.2 or sourced. Human review: pending (BayHeat editorial desk). Licensed review: no page-specific approval recorded.

Technical review: no page-specific licensed approval recorded.

M measured · C computed · S spec · R reference · E estimate

Portable garage heaters

Model pick · spec-based

Comfort Zone CZ798GR3 1,500W milkhouse heater

For one bay or workbench on a 15 A circuit with nothing else on it: a fan-forced 1,500 W milkhouse heater.

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Paid linkSee three 1,500 W portables ↓

Sole load on the circuit. No extension cords or power strips. Manual: attended use only, never while you're away or asleep, and not where gasoline, paint or flammable liquids are used or stored. Source ↗

A 1,500W portable heater draws — above the cord-and-plug limit on a 15A circuit shared with other outlets (). As the only thing plugged into that circuit it's fine; on a dedicated 20A garage circuit it's comfortable either way.

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What your garage's circuit can actually carry

A 1,500W heater at 120V draws . Run through the same fitsCordAndPlug() check the calculator uses, that current comes out over the 80% cord-and-plug cap on a 15A circuit that also feeds other outlets — it doesn't fit.

CircuitCord-and-plug limit1,500W heater fits?
15A, shared with other outletsNo
15A, heater is the sole load—Yes, per the heater's own manual
20A, dedicated garage circuitYes

Most garages already have the third row: . If yours does, a 1,500W portable heater has plenty of headroom on it.

Every heater on this page ships with a manual instruction to be the only thing plugged into its circuit — Sole load on the circuit. No extension cords or power strips. Manual: attended use only, never while you're away or asleep, and not where gasoline, paint or flammable liquids are used or stored. That instruction is what makes the 15A sole-load row above hold; skip it and you're back to the shared-circuit math, which doesn't fit.

Three 1,500W portables, side by side

120V · MILKHOUSE · 1,500W

Comfort Zone CZ798

at . Floor-standing, fan-forced.

Sole load on the circuit. No extension cords or power strips. Manual: attended use only, never while you're away or asleep, and not where gasoline, paint or flammable liquids are used or stored.

Check CZ798 price on Amazon

Price class: $

120V · WALL INFRARED · 1,500W

Heat Storm HS-1500-TT

, wall-mounted at minimum, with side clearance.

Manual: not where gasoline, paint or flammable liquids are used or stored.

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Price class: $

120V · GENERIC · 1,500W

Any UL-listed 1,500W portable utility heater

No verified nameplate on file for a specific model here — the 12.5A figure above comes from , the standard 1,500W/120V draw, not a manual.

Sole load on the circuit. No extension cords or power strips. 3 ft from anything flammable.

Search 1,500W portable heaters

Price class: $

Two things not to do

Don't run it on an extension cord. A 1,500W load pulls continuously through a cord rated for far less than a fixed receptacle, and the connection heats up at every plug and splice — the failure mode is a melted cord or an arcing connection, not just a tripped breaker. Plug directly into a wall receptacle every time.

Don't run two heaters off one 15A circuit. Two 1,500W heaters together draw — already over a 20A breaker's rating, let alone a 15A one. If you need more heat than one portable unit gives you, that's a sign to move up a class, not add a second cord to the same outlet. See 240V garage heaters → for the hardwired classes built for that.

Safety

requires GFCI protection on the receptacle any of these heaters plugs into. Keep the heater a safe distance from anything flammable, per its own manual, and never leave it running unattended overnight. Your electrician and your local code edition govern.

General information. Your electrician, gas fitter, local code and the heater's manual govern.

Related

Sources

  1. [1] NFPA 70, National Electrical Code, 2023, NFPA. Retrieved 2026-09-25.
  2. [2] Comfort Zone CZ798CA2 milkhouse heater instruction manual (Canadian Tire copy), Comfort Zone / Canadian Tire. Retrieved 2026-10-09.
  3. [3] Heat Storm Tradesman HS-1500-TT owner's manual, Heat Storm. Retrieved 2026-09-25.
Size my garage — 60 s