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About Pressurised Fresh Water Pumps
The size and shape of your vessel or vehicle, and the number of water outlets you require, will determine the size of the pump and the other system components, and how much pipework you will need. This schematic diagram depicts a typical system, and shows how the components are linked.
For installations with up to 6 outlets
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Pump model |
Output, litres/minute |
Recommended for: |
| Par Max 2 | up to 10.6 litres/minute (2.3 gallons/minute) open flow | galley & toilet with small diameter shower |
| Par Max 3 | up to 13 litres/minute (2.9 gallons/minute) open flow | galley & toilet with standard domestic shower |
| Par Max 4 | up to 16 litres/minute (3.5 gallons/minute) open flow | galley & 2 toilets with standard domestic shower |
| Sensor Max | up to 17 litres/minute (3.5 gallons/minute) open flow | Jabsco's latest microchip controlled pump adjusts its speed automatically to meet demand, while maintaining a constant output pressure. It doesn't need an accumulator tank (see below), but note that systems with water storage heaters will still need an expansion tank. |
For a recommendation for a plastic pipework system, or for larger systems (i.e. - more than 6 outlets), visit Cleghorn Waring.
Accumulator Tanks
An accumulator tank is an important part of any pressure-controlled water system. Fitted close to the pump discharge, it acts as a pressure buffer, absorbing flow from the pump when demand is low, and smoothing the outlet pressure. By removing the need for the pump to run immediately an outlet is opened, it extends pump life and reduces battery drain. The larger the accumulator tank, the less often the pump has to start.
The larger tanks have an appreciable water storage capacity - approximately half the nominal tank volume. The larger your pressurised system, or the higher the demand for water, the larger the accumulator tank should be. For minimum wear and tear on your pump, fit the largest accumulator tank you can.
Accumulator tanks are also used as expansion vessels in conjunction with water storage heaters.
Water Storage Heaters
Even the smallest water-cooled marine engine discharges large amounts of 'waste' heat. This rejected energy won't help to propel your boat, but it's ideal for heating your domestic fresh water supply, and far too useful to be dumped straight overboard. Why waste it? With a fully-insulated C-WARM water storage heater, you can heat a full tank of water (small or large) within half an hour, and keep it usefully warm for many hours after you have stopped the engine. Visit Cleghorn Waring for more information.
Pipework and Fittings
The best plastic pipework is flexible, non-toxic, resistant to algal growth, immune from electrolysis, frost-resistant, noise-suppressing, and remarkably easy to fit, extend, alter or dismantle - visit Cleghorn Waring to find out more.
No Jabsco pump should be used for petrol, solvents or any liquid with a flash point below 37oC( 98oF)
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