I have both types of pump. The barge has a 24v 1.5" Gulper and takes ages. As Midnight says, in Earnest, the 240v 1.5" Jabsco jobby is bloody quick to empty a full tank. The barge poo tank Gulper has never gone wrong, but has not seen a lot of action. Gulpers are not infallible, the newer ones have a steel worm, and if this gets at all rusted, it strips the nylon cog (this happened on the shower waste Gulper on the barge in Ireland - super damp conditions - now replaced with a S/H brass worm jobby) Over 22 years the 240v Jabsco has got through 1 impellor (I carry a spare) and has had to be cleaned out twice, as the impellor chamber gets clagged up with scale. The motor / capacitor has never gone wrong. The 3.5kW Travelpower has only ever failed to start this pump a couple of times, due to being clagged up, cured by removing the plastic fan and rotating a few times with Vise Grips. My old 1600w Victron multi would never start the pump, whereas the new 3000w one does. Last year the Travelpower broke (since fixed - the alternator had only just been refurbished, one of the big output chokes was found to have a fused end) and I upgraded the multi to a 3000w, so now have two mobile ways to start the poo pump and run the washing machine. At the same time to have total belt and braces, I bought a standby 1.5" Gulper. No doubt the 22 year old and untouched Jabsco macerator bog will now go wrong. I have a complete motor / fan / gasket set for this. We also carry a cassette. Over the 22 years we have owned Earnest, I have had to continuously take out ballast as Mrs TNC says it is now a floating junk shop. Next week, we to are heading down to "The East".