The Webasto Thermo Top Evo is a powerful and compact diesel liquid heater (boiler) specifically designed for marine applications. Delivering a maximum heat output of 5 kW, it is the ideal solution for vessels up to 50 feet, providing both efficient cabin heating and domestic hot water.
Webasto Thermo Top Evo: Efficient Hydronic Heating
Unlike air heaters, the Thermo Top Evo heats a water/glycol mixture that is circulated through a “wet” system. This allow for a versatile installation that can include radiators, towel rails, and SureCal calorifiers for hot water. Its compact footprint, low-noise operation, and energy-efficient performance make it a preferred choice for cruisers and narrowboats alike.
The system is highly customisable, with optional upgrades such as the Webasto MultiControl Timer, room thermostats, or the ThermoConnect TCON 2 for smartphone-based remote control.
Expert Installation and BSS Safety
Our OFTEC-trained engineers specialise in Webasto Thermo Top Evo installations, ensuring all fuel, exhaust, and plumbing connections meet the highest marine safety standards. Professional installation is critical for ensuring clean combustion and long-term reliability. For full Boat Safety Scheme (BSS) compliance, we use marine-grade exhaust systems and insulated hull fittings.
Technical documentation is available via the Webasto Corporate Technical Portal, and general guidance can be found in the OFTEC consumer guide for liquid fuel heating
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 Thermo Top Evo 5 Heater Kit Includes:
| Webasto Thermo Top Evo 5 kW Liquid Diesel Heater – 12 Volt |
| Circulation Pump |
| Fuel Pump |
| Webasto Controller with Timer |
| Fuel Pick-up Pipe |
| Electrical harness c/w fuse holders and fuses |
| 1m Exhaust Pipe |
Webasto Thermo Top Evo Narrowboat Kit:
Includes Webasto Thermo Top Evo Boat Diesel Heater, Webasto Multi Control Timer, 2m Marine Exhaust, Exhaust Skin Fitting, Fuel Line Kit, Header Tank and Safety Certificate.
£1998.85 including free installation Winter 25/26
Webasto Thermo Top Evo Heater:
£1450.00