Hi, I am looking for a replacement dosing pump for my Webasto ThermoTop C (narrowboat / diesel installation) and see that there are potentially two options: 82553B (which looks like the existing one) and the 86115A which is significantly cheaper - would you be able to advise of the differences between these pumps? And if poss advise which is the recommended replacement. Thank you for your attention, Regards, Martin

Hi Martin, thank you for your questions. Both pumps would be suitable for your Thermo Top C, if I were to replace the fuel pump on my heater I would be more than happy with the 86115A. The lower cost unit has the same warranty and longevity as the 82553B. The more expensive version is included in new heater kits from factory, we stock this as a spare part for applications requiring a like-for-like replacement. I hope this is helpful. Kind regards, Matt