Heatstrip · Installation
Heatstrip Mounting Height and Clearances
Heatstrip heaters perform correctly only within a specific mounting-height window. Too low and you risk heat on the ceiling. Too high and the radiant pattern dissipates before it reaches people.
By Reed · Updated November 10, 2026
What you need
- Tape measure
- Stud finder
- Ladder
Mounting height targets
- Classic THH1800A/THH2400A/THH3200A — MINIMUM
- 2.1 m (6'10")
- Classic — IDEAL
- 2.2-2.5 m (7'2" to 8'2")
- Classic — MAXIMUM
- 2.7 m (8'10")
- Classic RH180 (Bunnings exclusive) — ideal
- 2.1-2.2 m (6'10" to 7'2"), max 2.3 m
- Max THX2400/THX3600 — MINIMUM
- 2.1 m (6'10"), including flush mount
- Max — IDEAL
- 2.4-2.8 m (7'10" to 9'2")
- Max — MAXIMUM
- 3.2 m (10'6")
Step by step
Determine your ceiling height
Measure finished floor to ceiling at the mounting point. This is the vertical envelope you have to work with.
Subtract heater depth from ceiling clearance
Classic is 48 mm (~2 inches) thick. Max is 80 mm (~3.2 inches) thick. If you flush-mount, the entire heater body sits inside the ceiling plane. Ceiling-brackets add 2-6 inches depending on model.
Verify people-clearance below heater
The heater needs minimum 2.1 m above the floor (6'10"). Too low and tall users brush the heater; too close to people's heads and radiant feels uncomfortable.
Use an extension pole if needed
Heatstrip sells extension pole sets in 300, 600, 900, and 1200 mm lengths (12", 24", 35", 47"). Use these to drop the heater below a too-high ceiling. Chain and wire are OPTIONAL and sold separately.
Confirm IP rating matches your location
Classic is IP55. Max is IPX5. Both handle outdoor rain exposure, but neither is submersible. Direct downpours onto an un-covered heater need the IP rating in the manual.
Common mistakes
- Mounting below 2.1 m thinking it'll feel warmer. Below-spec mounting voids warranty AND concentrates heat too close to overhead surfaces. 2.1 m minimum is non-negotiable.
- Mounting above the max height to 'make room'. Classic above 2.7 m or Max above 3.2 m doesn't deliver rated performance. Use extension poles to bring the heater down to spec.
Hands-on tips
- Pull the installation manual PDF BEFORE buying — some patios can't fit Max (needs 2.4-2.8 m ideal) but fit Classic easily.
- Order the extension pole set WITH the heater — they're sold separately and often arrive after the heater does.
Questions people ask
Can I flush-mount Heatstrip into a ceiling?
Heatstrip Max includes flush-mount as a minimum-height configuration (2.1 m). The heater body sits inside the ceiling cavity; you need enough joist depth. Pull the install manual for the joist-depth spec.
What if my ceiling is 10 feet (3 m)?
That's the max mounting height for Max (3.2 m limit). You're at the edge of spec — consider a 600 mm extension pole to bring the heater to the ideal 2.4-2.8 m zone for better radiant performance.
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