It depends on how many sinks and showers you have on the boat and how many outlets you use at once. A good 3 gallon per minute pump will power two sinks and a shower very well as long as someone isn't washing dishes while someones in the shower. For multiple sinks and showers to run simultaneously it is well advised to go to a 5 GPM or larger. Shurflo, Jabsco, and West Marine brand pumps are all very comparable and will self prime ensuring no damage if ran dry.
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It depends on how many sinks and showers you have on the boat and how many outlets you use at once. A good 3 gallon per minute pump will power two sinks and a shower very well as long as someone isn't washing dishes while someones in the shower. For multiple sinks and showers to run simultaneously it is well advised to go to a 5 GPM or larger. Shurflo, Jabsco, and West Marine brand pumps are all very comparable and will self prime ensuring no damage if ran dry.
Thank you for the feedback. It was very helpful! I have two sinks and a shower, so your response helped alot.