Webasto EHM1800W Electric Heat Module for A18/A36 Air Handlers – 1800W 230V

Description

The largest module in Webasto’s electric heat lineup, the EHM1800W delivers 1,800 watts for the A18 and A36 air handlers — the two highest-airflow models in the A-Series range. This high output cabin heating accessory is built for the biggest cabins or common areas that need genuinely substantial heat output independent of the central chiller.

An 1,800-watt module at this end of the range isn’t just a comfort supplement; for boats spending real time in cold-weather cruising, it’s the difference between a cabin that stays genuinely warm and one that merely takes the edge off. Pairing it correctly with an A18 or A36 handler matters for getting that full output where it’s actually needed.

Key Features of the Webasto EHM1800W Heat Module

As the largest EHM offered, this module gives the biggest A-Series air handlers standalone heating capability strong enough to serve as a genuine primary heat source, not just supplemental warmth.

• Enables heating in selective cabins while the central chiller runs in cooling mode elsewhere
• Enables heating even while the central chiller is switched off entirely
• Increases heat output of the air handler when extra-high heat demand is needed
• Directly connected to A-Series electronics, requiring no separate controls
• Can be easily retrofitted to existing A-Series air handler installations

Webasto EHM1800W Technical Specifications

These figures come from Webasto’s official spec sheet for this listing. Following the same pattern found across this EHM product line, this page’s bold introductory text incorrectly states “Compatible with A4 Compact Air Handler,” while the specification table correctly lists compatibility as “A18 Compact/Slimline/Low Profile & A36 Compact Air Handler.”

• Capacity: 1,800 Watts
• Compatibility: A18 Compact/Slimline/Low Profile & A36 Compact Air Handler (per specification table; intro text on this page incorrectly states A4 — see note above)
• Hose Connection: 6″ (150mm)
• Voltage / Frequency: 230V / 50-60 Hz
• Current Draw Running: 8 A
• Max Supply Air Temperature: 104°F (40°C)
• Air Pressure Loss: 60 Pa
• Dimensions (W x L x H): 5.9″ x 14.6″ x 8.7″
• Net Weight: 6.6 lbs

Why Choose the Webasto EHM1800W

This unit carries Webasto’s standard 2-year warranty. At 8A running current, this is the highest draw in the EHM lineup, so plan your cabin’s electrical circuit accordingly. Given the compatibility contradiction on this listing, confirming the correct handler match (A18/A36, not A4) with Webasto or CTM before ordering is essential.

What to Know Before Installing

• Confirm compatibility against the A18 or A36 handler models specifically, not the A4, given the contradiction on this listing noted above
• A flow control valve must also be fitted when using this module — it does not work as a standalone installation
• Comes preinsulated to prevent exterior condensation, with 2 stainless steel mounting brackets included for wall mounting
• At 8A, this module’s current draw is meaningfully higher than smaller EHM modules — confirm your cabin circuit can support it