This is the Seaflo 55 Series pump sold as a system with a 2 gallon accumulator tank, which is the single best answer to the pulsing complaint about high-flow pumps. The accumulator stores a little pressurized water, so the pump runs in longer, calmer cycles instead of rapid starts at a trickle. The pump itself is a 12 volt unit with a 60 PSI shut-off and 5.5 GPM open flow.
It is backed by Seaflo's four-year limited warranty and can self-prime up to 6 feet. The listing says it can run dry without damage for a short time, which helps after winterizing.
It sits in the highest price tier because of the bundle. Compared with the bare pump, you pay for the tank and plumbing fittings but save the time of sourcing them. Set the tank pre-charge about 2 PSI under the cut-in pressure. The accumulator uses an air charge, so check it with a tire gauge before first use and each spring. A two gallon tank is large for a shower circuit and gives the pump room to rest between cycles, which is easier on the motor and the battery. Mount the tank close to the pump outlet so the pulses are damped before they reach the plumbing.
What works
- 2 gallon accumulator included
- Four-year limited warranty
- Self-primes up to 6 ft
- Short dry-run tolerance
Watch out for
- Highest price tier
- Takes more space than a bare pump
Spec sheet
- Model
- SFWSK1-055-060-0021
- Flow
- 5.5 GPM (20.8 LPM)
- Shut-off pressure
- 60 PSI
- Accumulator
- 2 gallon tank
- Warranty
- 4 year limited





