An engineer had fitted a Webasto Thermo Top Z as a replacement for an Eberspacher D5W. The photo shows how badly the install was done – notice they’d used the original 24mm Eberspacher exhaust (Webasto 22mm), Eberspacher fuel pump (which has different pulse rate to the Webasto and heater running way too cool never getting up to temp), and connected Eberspacher 4mm fuel line to 5mm Webasto burner. Also see the header tank feeds outlet side of heater (not low pressure side of waterpump) and this always is a bad idea and making bleeding v difficult. The Thermo Top Z’s were fitted to Rover 75’s and Land Rover in early 2000’s. People will tell you settings are different  – running temp is slightly higher and cut off voltage is higher but this has no affect on how it will run if properly installed in a narrowboat. Only problem with the Thermo Top Z is control units can fail and they’re now nearly 20 yo.


I properly install a Webasto Thermo Top E kit. Steel upstand welded to the swim and heater mounted on rubber mounts. New isolation ball valve and Webasto copper fuel line kit. Hard to see in photos. Customer very happy with the work and noise from the heater through the boat kept and minimum.


Leave a Reply