A high-quality diesel heater is the heart of a comfortable narrowboat or yacht during the winter months. However, like any precision marine appliance, regular diesel heater maintenance is required to ensure it runs efficiently and safely.
Neglecting these simple steps can lead to “coking” (carbon buildup) or, in worse cases, a failure during a freezing night. Here is our expert checklist for keeping your system in peak condition.
1. The 30-Minute Monthly Run
Even in summer, you should fire up your heater for at least 30 minutes once a month. This prevents the fuel from priming or “waxing” in the lines and keeps the internal moving parts lubricated.
2. Inspect the Exhaust & Air Intake
Check your external skin fittings for obstructions. Spiders, debris, or even heavy soot buildup can restrict airflow, causing the unit to overheat or shut down.
3. Check Fuel Quality and Filters
Diesel sitting in a tank over winter can develop “diesel bug” or condensation. Regularly inspect your inline fuel filters. If the fuel looks cloudy or contains sediment, it’s time for a flush.
4. Monitor Battery Voltage
Most “start-up” failures are actually electrical. Diesel heaters require a high initial current to heat the glow plug. Ensure your marine electrical system is healthy and connections are free from corrosion.
5. Professional Servicing
While daily checks are simple, an annual strip-down by certified marine professionals is the only way to clean the internal burner chamber and ensure 100% BSS compliance.
Need Professional Help?
If your heater is blowing smoke or failing to start, don’t risk a DIY repair on a critical safety system. Get in touch with our OFTEC certified engineers.