Thread: Electronic pump controller

My old onga houshold water pump refuses to die.
The old mechanical pressure switch (square D type) finally packed it in. I have replaced this with an electronic controller like this Automatic Pressure Switch Control Electric Electronic Water Pump Controller | eBay and removed the accumulator tank.

The "upgraded" controller senses flow so comes on as soon as a tap is opened and stays on till the flow is stopped. The old system was pressure sensing and started and stopped to maintain pressure.

Im wondering which system is more efficient? The new systems runs constantly on demand whereas the the older system pulsed on and off.

No maintenance (checking and adjusting air charge in pressure tank 2-3 times a year)
No cycling at flow rates of less than 1L per minute
Better pressures delivered at low flow rates as pressure switch is no longer limiting the top pressure achievable, then running down while the pressure tank volume is expended before the pressure switch cycles the pump back on
Loss of prime / dry run protection/shutdown (invaluable when water supply is a fixed/limited volume like a water tank or a low yield spear point/bore). Prevents the pump from destroying itself from running with no water.
Cheaper than a tank & pressure switch
On larger pumps no cycling of water pressure making the shower go hot/cold/hot/cold
Pump running constantly uses less power than a pump cycling on/off constantly

.... But, no small volume draw of for small volume requirements like filling a glass/jug/saucepan/water bottle/kettle, etc
An 8L tank with the correct pressure (2psi below cut-in pressure of the pressure switch) should draw off approx' 2.5L of water before the pump turns on .... And 18L tank should do around 6L ... The electronic controller will start the pump for every demand .... Even a cup of water.

IMHO the positives outweigh the negatives.

There's a start !