The boat we're chartering next week, a Moorings 45.3 monohull, has electric heads. Other than a Hunter many years ago, this will be our first boat with electric heads. Also since it is our first trip in 15 years, it will be the first time we're on a boat that is using the holding tanks. There will be 4 of us and the boat has 3 electric heads.

In order to keep from clogging the head, with minimal TP usage, frequent flushes would seem in order. My concern is the electric drain on the house batteries by the flushes. Also, is there typically a manual pump that can be used in lieu of the electric pump? The boat doesn't have a genset but does have 340ah of house batteries.