A 4 to 6 GPM pump keeps the shower going while someone runs the kitchen tap, which suits motorhomes, fifth wheels with two bathrooms and larger boats. These cost about $60 to $354. The bigger pumps draw up to 18 A, so check that the wire and fuse can carry the maker’s maximum draw before you upgrade.
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Full ranking 12
- Seaflo 56A Variable Speed 5.0 GPM#1 of 12Full review
The best overall pick: a variable-speed 5 GPM pump that keeps the shower steady while other taps open, at well under the price of other variable-speed pumps.
Amazon $159.99$159.995 GPM70 psi10 A - Seaflo 55 Series 5.5 GPM 60 psi#2 of 12Full review
A lot of flow and pressure for the money, for big rigs and boats with several fixtures. Check that the wiring can carry its 17 A draw.
Amazon $110.86$110.865.5 GPM60 psi17 A - Wassermann 4WDP5 5.0 GPM 55 psi#3 of 12Full review
The cheapest high-flow pump here by a wide margin. Buy it as a budget upgrade if you can live without a published warranty.
Amazon $63.16$63.165 GPM55 psi- - Jabsco Par-Max HD6#4 of 12Full review
The highest-flow pump here, 6 GPM at 60 psi, for big boats and multi-bath motorhomes that can feed its 18 A draw.
Amazon $266.47$266.476 GPM60 psi18 A - Remco Aquajet RV Variable Speed#5 of 12Full review
A variable-speed, high-pressure pump for motorhomes with filtration or long runs. The Seaflo 56A does the same job for less.
Amazon $226.10$226.105 GPM75 psi- - Jabsco Par-Max HD5#6 of 12Full review
A heavy-duty 5 GPM, 60 psi pump for larger boats and motorhomes. Seaflo’s 55 Series gives more flow for half the price.
Amazon $228.83$228.835 GPM60 psi13 A - Wassermann 3WDP4 4.0 GPM 45 psi#7 of 12Full review
A low-cost 4 GPM pump for a trailer owner who wants more flow than the stock pump. Its sibling 5 GPM model costs only a few dollars more.
Amazon $59.99$59.994 GPM45 psi- - Jabsco Par-Max HD4#8 of 12Full review
A heavy-duty 4 GPM, 60 psi pump with a 3-year warranty at a fair price, for boats and RVs with two fixtures.
Amazon $165.60$165.604 GPM60 psi11.5 A - Shurflo Aqua King II Supreme 5.0#9 of 12Full review
A high-flow marine pump that is easy on the batteries for its 5 GPM. It is the most expensive pump here.
Amazon $359.09$359.095 GPM55 psi7 A - Shurflo Aqua King II Premium 4.0#10 of 12Full review
A marine-grade 4 GPM pump for boats and larger RVs with several fixtures. It costs more than pumps with similar flow and pressure.
Amazon $236.33$236.334 GPM55 psi10 A - Shurflo 4048 High Flow 4.0 GPM#11 of 12Full review
Shurflo’s high-flow RV pump for rigs that run more than one fixture. Pumps with the same 4 GPM and higher pressure cost less.
Amazon $248.99$248.994 GPM55 psi10 A - Johnson Pump Aqua Jet WPS 4.0#12 of 12Full review
A marine pressure pump with a 3-year warranty, for boats where 41 psi is plenty. RV owners after a firmer shower should look at 55 psi pumps.
Amazon $185.09$185.094 GPM41 psi-
