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Water Pump

We have just found that our pump has failed, this is for our main water supply, currently we have a Jabsco Par-max 2.9 auto model 31395-0292, this was fitted when the boat was built and is coupled with an accumulator tank. my question is is replacing this with a like for like the best option? obviously there would be no pipe work modifications required but as i have read this is not meant for long periods of constant use and as the shower would mean it is running for about 10 minutes at a time i am concerned that this may be why the unit failed (bearing on pump head siezed)
also is there any water filters/strainers that i could use to protect the pump better in future?

Asked by: Carl Merry  | 9.23am, Wednesday 2 January

WW says:

As you say, replacing like-for-like is easiest- many people now consider water pumps to be an expendable option. Some boats, especially hire craft, fit two, so that if one fails you can quickly switch over to another!
It is possible to have an external pressure switch, which overrides the inbuilt pressure sensor, which can mean the pump running to a lower pressure. If you have a calorifier, you should ensure that any pump is not going over 30psi and probably lower. Lower pressure can mean fewer leaks.
If you have had five + years out of your pump, you may be doIng well. There are heavy duty water pumps available, but they tend to be a bit large and exceptionally pricey for Narrowboats. Mainly it is frost damage that causes issues, along with the seals failing, rather than the bearings giving up. Alas, as most are sealed for life, it can be difficult to lubricate the motor or change the diaphragm/seals in many units.
You can fit a strainer just before the pump which can prevent diaphragm damage from rust or other debris drawn in from the tank. They are cheap and easy-to-fit; some manufacturers include then with their new pumps. They are a simple gauze filter which can be cleaned and can also be bought separately.
If you installlation doesn't already have full-flow valves either side of the pump/accumulator assembly, add some when you replace the pump- it makes future maintenance easy and also encourages frequent cleaning of the inlet strainer, if you fit one

Mark Langley  | 4.58PM, Wednesday 2 January

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