John Edwards suggests a more efficient way to empty your shower tray
When our existing electric heads shower pump came up for its fourth expensive overhaul, I decided to redesign the system to try to make a cheaper and more reliable alternative, writes PBO reader John Edwards.
First, I measured the outflow from a showerhead and estimated I would need a pump with a flow of 40-50lt/min.
I then constructed two 200 x 225 x 150mm sump boxes, one each for the forward and aft bilges.
The boxes were made in WBP ply, filleted and saturated with epoxy laminating resin. A visit to the marina chandlery with my boxes showed that pumps with 20mm hose stubs fitted neatly inside.
The output of the pumps was less than ideal, especially as they needed to lift the water 1.5m and their efficiency falls off rapidly when the head is above one metre, but they fitted the existing pipework so the decision was made.
I equipped each box with a float switch to control the pump, and placed fine strainers in the drains of the washbasin and shower trays to prevent hair entering the system.
In case the pumps were overwhelmed by the inflow from the heads, I fitted a restrictor in the outfall pipe to slow down the flow, effectively storing the water in the wash basin/shower tray and pipework until the pump had time to complete the job.
I also added a non-return valve 300mm up the outlet pipe to prevent a pipeful of water flowing back into the box, setting the pump off again ad infinitum. The system works well, quietly and efficiently, without the need for the restrictor, and the total cost equalled two overhauls of the previous displacement pump, which after eight years was definitely feeling its age.
Pumps and float switches x 2 …….. £52
Non-return valves ……….. £18
Ancillary connectors, hose clips …. £10
WBP ply …………………… £8.40
Epoxy was already on board
Send us your practical ideas!
We pay for every practical idea published in the magazine so why not send us yours? Email firstname.lastname@example.org
PBO reader Tim Marsden shares a practical project to ensure the smooth closure of locker lids
John Macdonald makes a low-wattage anchor light from odds and ends – plus an outlay of 99p
Building site spikes keep tricolour clean - Willem Bijl keeps his tricolour light seagull-free
Whether it's making an instrument panel from a tablet stand, turning bed slats into a dinghy floor, creating a wine…
Boat trailer electrics, especially trailer light plugs are very susceptible to damage, either through the wires being pulled out or…
Peter Crick makes a gate in his pushpit - which then goes on to save a life!
Ron Stark chocs up a successful means of hoisting a black ball day signal for a vessel at anchor
A bright idea means Jeremy White’s anchor ball is never forgotten
The illustration shows the only way I have been able to stop through-deck chainplates from leaking. The ‘bonnet’ is made…
It is amazing how crew always seem to disappear when boat maintenance time comes. I always end up painting the…
Rough quays are a problem now and again and certainly something to be mindful of when mooring up for the…
Robin Benjamin goes on a one-man mission to eliminate unnecessary holes, starting with mounting his tiller pilot using an antenna…
David Weston shows that nautical wisdom can be proved wrong