The Webasto Air Top Evo 40 is a high-capacity diesel air heater engineered for larger boats up to 45 feet. It represents a significant step up in power and sophistication from the 2000 STC model, making it the preferred choice for owners of medium-to-large yachts and narrowboats who require rapid heating and precise climate control.
Webasto Air Top Evo 40: Powerful and Intelligent Heating
The Air Top Evo 40 delivers a formidable 4kW of heat output while maintaining impressive fuel efficiency. It features intelligent blower control and a multi-mode operation system, allowing the heater to adjust its performance based on the specific needs of the cabin. This results in ultra-quiet operation and a highly stable interior temperature. The Evo 40 is also equipped with an automatic altitude adjustment feature, ensuring reliable performance across various geographic conditions.
A standout feature is the included Webasto MultiControl digital interface, which allows users to program heating schedules, adjust fan speeds, and toggle between heating, ventilation, and “boost” modes with ease.
Expert Installation and BSS Safety
Our OFTEC-trained engineers provide professional Webasto Air Top Evo 40 installations, utilizing high-quality marine-grade components. This includes a room-sealed exhaust system and a stainless steel through-hull skin fitting to ensure full compliance with Boat Safety Scheme (BSS) standards. For additional technical resources, you can consult the Webasto Corporate Technical Portal and the OFTEC consumer guide.
Free Installation Offer Winter 2025/2026
We are offering free installation for all diesel heater narrowboat kits between the 15th of November 2025 and the 15th of February 2026. See individual appliance listing for boat stove kit prices. Email us for details.
Webasto Air Top Evo 40 Narrowboat Kit:
£2445.00 including free installation Winter 25/26
The Air Top Evo 40 kit includes:
- Air Top Evo 40 Diesel heater
- Stainless steel mounting bracket
- Complete wiring harness
- Webasto MultiController
- Fuel pump
- Copper fuel line and hose connectors
- Stainless steel room sealed exhaust system, complete with silencer and lagging
- Insulated stainless steel through hull skin fitting
- Diesel Appliance Safety Certificate