**Update March 2021** I’ve made the decision to concentrate on the  electrical work I enjoy the most and no longer carryout any heating work.

Full (from scratch) and partial (boiler only) diesel fired central heating installations carried out. I’m NOT tied to a particular brand and I will (and do) fit whatever a customer specifies. I recommend Webasto Thermo Top because in my experience they are the best heater available at the moment.

  • They’re quiet.
  • Reliable: Main components – ECU, airmotor, waterpump and fuel pump are very well made. There are no specific weaknesses unlike those found with the other comparable heater systems that I work on.
  • Easy to service with a simple one piece stainless steel burner which you can get inside.
  • Good dealer network.
  • Most popular diesel heater unit fitted to narrowboats in the UK. This means most fitters/engineers are used to working on them.

When a Webasto heater fails prematurely it’s generally because it’s been installed incorrectly. For a Webasto to perform efficiently and be reliable long term it’s most important the fuel supply and the central heating circuit inside the boat are installed correctly. These are points and basic standards which you might assume every Webasto fitter installs to. Many engineers and boatbuilders don’t install to these fundamental standards.

I commonly fit diesel boilers as a solution for hot water: For customers who have a good solar system it makes it possible to be totally self sufficient with no need to run the engine in the Summer and much of Spring/Autumn; Or for a boater with an air cooled or vintage engine. There is a misconception that a diesel boiler can’t be used for just hot water. It’s perfectly possible to operate a system this way with minimal negative affects on boiler lifespan so long as the user knows and understands what they’re doing and the system is setup for it.

Above the basic requirements my installs are always neat and tidy and well thought out. The standard wiring loom is shortened, clipped and supported properly. Exhaust systems are supported and installed neatly and where necessary extra lagging is used – the lagging sock supplied by Webasto are not great. Fuel pipe is properly fixed and supported. I pay great attention to refinement and add extra features so the heater runs quietly. Sometimes the heater can be mounted on a welded steel upstand on the swim. This is a neat way to install, keeps fuel pipe lengths short, and helps maximise refinement inside the cabin.

If there’s any doubts about the existing fuel supply I fit a new dedicated supply which is as per the spec recommended by Webasto and draws from 5-6 inches off the bottom of the tank to limit the affects of a diesel bug and water contamination.


Using the wrong type, concentration, and mixing different types of antifreeze can lead to serious problems with all diesel boilers and central heating systems. This is particularly true of Webasto heaters which use a very small aluminium heat exchanger.

  • I don’t recommend using any additives and generally only use good quality blue ‘2 year’ antifreeze.
  • If you are going to add different types/brands of antifreeze make sure they are compatable. Mixing different types of antifreeze can create serious corrosion and scaling issues causing boiler heat exchangers and coils in the calorifier to become inefficient (requiring replacement).
  • If there’s any doubt about the age or condition of coolant in the system then it should be drained and refilled.
  • If the coolant is an opaque brown colour (caused by mixing 2 & 5 year antifreeze) or there’s significant scale/rust suspended in it then it should be flushed too.
  • Using the correct ratio of antifreeze is particularly important with the Webasto Thermo Top.