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

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.

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