Replacing a well pump: pressure tank, switch or press control
Well pump won't start: pressure tank, pressure switch or electronic press control. Why it fails, when to replace it, and the mistake of skipping a check valve.
English · Original discussion in Spanish · Published
Replacing a well pump: why the press control won't start
Why won't the water pump kick in when it should? That's the question a homeowner with a ten-metre well and a pump over twenty-five years old has been dealing with. The symptom is clear: the pump does start, but it takes minutes, and watering the garden becomes torture. The apparent cause: a misadjusted pressure switch and a pressure tank that has lost its air. The solution many choose: replacing the whole setup with an electronic press control. The result, in this case, a chain of expenses that doesn't fix the underlying problem.
Pressure tank or press control: what's the difference and which is better
A booster system with a 25-litre pressure tank maintains pressure through a membrane tank and a pressure switch that sets when the pump starts and stops. The electronic press control replaces both with a flow and pressure sensor. The practical difference: the pressure tank needs maintenance — reinflating the tank, replacing the membrane — while the press control has a flow limit and a one-inch thread, according to those who have installed one. The typical pressure tank failure is losing air or a burst membrane; the press control's is clogging or failing to detect the minimum flow.
Why the pump is slow to start and loses prime
The underlying problem may be the pump, not the controller. A suction pump can only lift water from about eight metres deep in real conditions, because atmospheric pressure pushes the water up and conditions are never ideal. If the well's water level drops, the pump runs dry, overheats and loses capacity. What's more, without a check valve at the end of the suction hose, water flows back into the well when the pump stops and it has to be primed again. That cheap detail explains many of the symptoms described: the pump starts but won't build pressure because there's air in the circuit.
When it's worth repairing and when to replace
With a pump nearly thirty years old, rusted and overheating right away, repair isn't worth it. A 25-litre pressure tank costs around 27 euros, and a pressure switch is cheap, but the labour to dismantle and reinstall can exceed the price of the equipment. In a shared system with a 200-litre pressure tank, replacing the membrane means disconnecting, dismantling and reassembling, and sometimes it's cheaper to replace the whole tank. The decision depends on the overall condition of the installation and whether the well keeps its water level.
In the end, the homeowner replaced the pump. The new one comes with dry-run protection. The old one, twenty-five years old and rusted inside, wasn't worth a screwdriver. Dry irony: sometimes the problem wasn't the pressure switch, the pressure tank or the press control. It was the water that never arrived.
Why won't the water pump kick in when it should? That's the question a homeowner with a ten-metre well and a pump over twenty-five years old has been dealing with. The symptom is clear: the pump does start, but it takes minutes, and watering the garden becomes torture. The apparent cause: a misadjusted pressure switch and a pressure tank that has lost its air. The solution many choose: replacing the whole setup with an electronic press control. The result, in this case, a chain of expenses that doesn't fix the underlying problem.
Pressure tank or press control: what's the difference and which is better
A booster system with a 25-litre pressure tank maintains pressure through a membrane tank and a pressure switch that sets when the pump starts and stops. The electronic press control replaces both with a flow and pressure sensor. The practical difference: the pressure tank needs maintenance — reinflating the tank, replacing the membrane — while the press control has a flow limit and a one-inch thread, according to those who have installed one. The typical pressure tank failure is losing air or a burst membrane; the press control's is clogging or failing to detect the minimum flow.
Why the pump is slow to start and loses prime
The underlying problem may be the pump, not the controller. A suction pump can only lift water from about eight metres deep in real conditions, because atmospheric pressure pushes the water up and conditions are never ideal. If the well's water level drops, the pump runs dry, overheats and loses capacity. What's more, without a check valve at the end of the suction hose, water flows back into the well when the pump stops and it has to be primed again. That cheap detail explains many of the symptoms described: the pump starts but won't build pressure because there's air in the circuit.
When it's worth repairing and when to replace
With a pump nearly thirty years old, rusted and overheating right away, repair isn't worth it. A 25-litre pressure tank costs around 27 euros, and a pressure switch is cheap, but the labour to dismantle and reinstall can exceed the price of the equipment. In a shared system with a 200-litre pressure tank, replacing the membrane means disconnecting, dismantling and reassembling, and sometimes it's cheaper to replace the whole tank. The decision depends on the overall condition of the installation and whether the well keeps its water level.
In the end, the homeowner replaced the pump. The new one comes with dry-run protection. The old one, twenty-five years old and rusted inside, wasn't worth a screwdriver. Dry irony: sometimes the problem wasn't the pressure switch, the pressure tank or the press control. It was the water that never arrived.
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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (30 replies).
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