Section · residential wells · Grundfos focus
Well pumps
Start with how a residential well system works, then size by GPM and head, then compare Grundfos SQ / SQE / SP / SQFlex families. Always have a licensed well contractor size and install from published curves and your well data.
Residential well pump basics
Start here — system parts, GPM vs head, constant pressure, casing limits, when to call a contractor.
Sizing: GPM and total head
Method before brand — peak flow, TDH, then pick the curve.
SQ vs SQE (constant pressure / CU)
Fixed-speed SQ vs variable-speed SQE with CU 301/302-class control.
SP series vs SQ / SQE
When a conventional SP fits versus the 3" electronically controlled family.
SQFlex solar / remote overview
Overview of off-grid and hybrid energy — not a drop-in grid SQE kit.
SQ / SQE family overview
Broader residential overview and hard-water cross-links.
Replacing a 40/60 well pressure switch
Symptoms, matching the switch, power-off safety, swap steps, and precharge.
Pressure tank precharge: how to check and set it
Drain to zero, measure at the air valve, set about 2 psi below cut-in, and spot a waterlogged tank.
Well water testing: what to test and how often
Yearly basics, one-time and as-needed tests, when to test right away, lab vs DIY kits, and sampling tips.
Well pump short cycling: causes and fixes
A triage order: tank precharge, tank size, switch port, leaks, check valves, then the pump.
Low water pressure on a well: a troubleshooting order
Gauge first, then filters and treatment, pressure switch, tank, leaks, and finally the pump and well.
Freeze protection for well houses and pressure tanks
Insulation, thermostatic heat, heat cable, alerts, and fire-safe practices — plus what to do if it froze.