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
We are offering free installation for all diesel heater narrowboat kits. See individual appliance listing for diesel heater 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 (Marine Fuel Filter, Valves, Copper Pipe, Clips, Fittings), Header Tank, Safety Certificate, and Free Installation.
£2560.00
Webasto Thermo Top Evo Heater:
£1680.00
Optional extras:
Diesel Appliance Safety Certificate – £59.00
Webasto Multi Control Timer – £110.00
Webasto Room Thermostat – £115.00
Webasto ThermoConnect TCON 2 – £349.00
2m Marine Exhaust Pipe 38mm – £135.00
38mm Exhaust Skin Fitting / Hull Fitting – £119.95
Marine Fuel Filter With Stop Tap – £49.50
Header Tank For Diesel Heater £85.00
Stainless Steel Coil Calorifier – Boat Hot Water Tank – Various Sizes