One of the few easy choices when searching for the best products in many categories was selecting Groco heads as hands-down the best out there. I would recommend the K-H 12 volt since you only have a single
bolt to unscrew to instantly change the unit to manual operation and can enjoy the benefit of a battery
when you have the juice available.
This model was designed in 1959 and has been in production since 1960
It will pump waste 18ft straight up. The first one that I bought, I thought that the rubber flap was part of the packing material and was yanking on it to try to pull it out (Hey, I didn't know). I called Groco and despite my confession of stupidity, they sent me a replacement kit for free and were incredibly helpful. I've since bought a second unit for my aft head
as well as several kits for rebuilding the gaskets, etc. from Defender.
I'll be interested to hear the water pump recommendations. I'll have to look up my model, which has been running without issue for half a decade that I know about and probably a lot longer if I recall
the date of the unit.
I have a Jabsco diaphragm bilge pump
as my primary pump - Something along the lines of this model: 36900 Fresh water pump > Switched Pumps > Water Pressure Systems > Jabsco - ITT
. It's a steady unit and easy to take apart to clean or replace gaskets.
I had a macerator and yanked it out. It's just something else to go wrong and mine certainly did. You can buy a Lectra-San unit for use in town and then Y-Valve it straight overboard
for use out to sea. You can check it out at: Raritan Engineering | Waste Treatment | LectraSan
. It runs off of battery
power so you can use it anywhere.