Well Pump Repair vs Replacement Cost Calculator

ANA›Life Services Authority›National Calculator Authority›Well Pump Repair vs Replacement Cost Calculator

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Well Pump Repair vs Replacement Cost Calculator

Determine whether repairing or replacing your well pump is the smarter financial decision using the 50% Rule and Net Present Value analysis.

Pump Type

Submersible Pump Jet Pump (Shallow Well, <25 ft) Jet Pump (Deep Well, 25–110 ft) Hand/Centrifugal Pump

Current Pump Age (years)

Typical lifespan: 10–15 years for submersible pumps

Well Depth (feet)

Depth affects replacement labor cost

Estimated Repair Cost ($)

Get at least 2 quotes from licensed well contractors

Estimated Replacement Cost ($)

Includes pump, labor, and materials

Annual Energy Cost – Current Pump ($/year)

Check your electric bill; well pumps avg $30–$75/month

Expected Energy Savings with New Pump (%)

Modern pumps are typically 10–30% more efficient

Additional Repairs Expected in Next 5 Years ($)

Estimate future repair costs if keeping old pump

Discount Rate / Cost of Capital (%)

Use your savings interest rate or loan rate (typically 3–8%)

Analysis Period (years)

How many years to compare costs over (1–20)

Calculate

const WEL_LIFESPANS = { submersible: { min: 10, max: 15, avg: 12, baseReplacement: 2200 }, jet_shallow: { min: 8, max: 12, avg: 10, baseReplacement: 1200 }, jet_deep: { min: 8, max: 12, avg: 10, baseReplacement: 1600 }, hand: { min: 15, max: 25, avg: 20, baseReplacement: 800 } };

function welUpdateDefaults() { const type = document.getElementById('wel-pump-type').value; const info = WEL_LIFESPANS[type]; const hint = document.getElementById('wel-age-hint'); hint.textContent = 'Typical lifespan: ' + info.min + '–' + info.max + ' years'; document.getElementById('wel-replacement-cost').value = info.baseReplacement; }

function welValidateAge() { const age = parseFloat(document.getElementById('wel-pump-age').value); const type = document.getElementById('wel-pump-type').value; const info = WEL_LIFESPANS[type]; if (age > info.max) { document.getElementById('wel-age-hint').style.color = '#c0392b'; document.getElementById('wel-age-hint').textContent = '⚠ Pump exceeds typical max lifespan of ' + info.max + ' years — replacement strongly advised.'; } else { document.getElementById('wel-age-hint').style.color = ''; document.getElementById('wel-age-hint').textContent = 'Typical lifespan: ' + info.min + '–' + info.max + ' years'; } }

function welGetVal(id) { return parseFloat(document.getElementById(id).value); }

function welCalc() { const pumpType = document.getElementById('wel-pump-type').value; const age = welGetVal('wel-pump-age'); const depth = welGetVal('wel-pump-depth'); const repairCost = welGetVal('wel-repair-cost'); const replaceCost = welGetVal('wel-replacement-cost'); const annualEnergy = welGetVal('wel-annual-energy'); const energySavPct = welGetVal('wel-energy-savings'); const futureRepairs = welGetVal('wel-repair-freq'); const discountRate = welGetVal('wel-discount-rate'); const years = welGetVal('wel-analysis-years');

// --- Input Validation --- const errors = []; if (isNaN(age) || age 50) errors.push('Pump age must be 0–50 years.'); if (isNaN(depth) || depth 1000) errors.push('Well depth must be 10–1000 feet.'); if (isNaN(repairCost) || repairCost $0.'); if (isNaN(annualEnergy) || annualEnergy 60) errors.push('Energy savings must be 0–60%.'); if (isNaN(futureRepairs) || futureRepairs 20) errors.push('Discount rate must be 1–20%.'); if (isNaN(years) || years 20) errors.push('Analysis period must be 1–20 years.');

if (errors.length > 0) { document.getElementById('wel-result').innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }

const info = WEL_LIFESPANS[pumpType]; const r = discountRate / 100;

// ── 50% Rule ────────────────────────────────────────────────────────────── // If repair cost > 50% of replacement cost → replace const fiftyPctThreshold = 0.50 * replaceCost; const fiftyPctRatio = (repairCost / replaceCost) * 100;

// ── Age-Adjusted Replacement Value ──────────────────────────────────────── // Remaining useful life fraction const remainingLife = Math.max(0, info.avg - age); const remainingFrac = remainingLife / info.avg; // Adjusted value of old pump = replacement cost × remaining life fraction const adjustedPumpValue = replaceCost * remainingFrac;

// ── Depth Surcharge ─────────────────────────────────────────────────────── // Labor surcharge: $2 per foot beyond 50 ft for submersible const depthSurcharge = (pumpType === 'submersible' && depth > 50) ? (depth - 50) * 2.0 : 0; const totalReplaceCost = replaceCost + depthSurcharge;

// ── Net Present Value of REPAIR Option ───────────────────────────────────
// Year 0: repair cost
// Years 1–N: annual energy cost (no savings) + prorated future repairs
// NPV_repair = repairCost + futureRepairs/(1+r)^2.5 [mid-point of 5 yrs]
// + Σ[t=1..N] annualEnergy / (1+r)^t
let npvRepair = repairCost;
// Future repairs discounted at midpoint (year 2.5)
npvRepair += futureRepairs / Math.pow(1 + r, 2.5);
// Annual energy costs (no improvement)
for (let t = 1; t 0
? netUpfrontExtra / annualEnergySaved
Infinity;

// ── Decision Logic ──────────────────────────────────────────────────────── const rule50Repair = fiftyPctRatio = info.avg;

let recommendation, recColor, recIcon; if (pumpOld && !rule50Repair) { recommendation = 'REPLACE — Pump is past its expected lifespan AND repair cost exceeds 50% of replacement.'; recColor = '#c0392b'; recIcon = '🔄'; } else if (!rule50Repair) { recommendation = 'REPLACE — Repair cost exceeds 50% of replacement cost (industry standard threshold).'; recColor = '#e67e22'; recIcon = '🔄'; } else if (pumpOld) { recommendation = 'CONSIDER REPLACING — Pump is at or past its expected lifespan; repair may only delay replacement.'; recColor = '#e67e22'; recIcon = '⚠️'; } else if (npvRepairBetter) { recommendation = 'REPAIR — Lower total cost over ' + years + '-year analysis period.'; recColor = '#27ae60'; recIcon = '🔧'; } else { recommendation = 'REPLACE — Lower total cost over ' + years + '-year analysis period despite higher upfront cost.'; recColor = '#2980b9'; recIcon = '🔄'; }

const fmt = v => '$' + v.toLocaleString('en-US', {minimumFractionDigits:0, maximumFractionDigits:0}); const fmtD = v => v.toFixed(1);

document.getElementById('wel-result').innerHTML = ` ### ${recIcon} Recommendation: ${recommendation}

Metric Repair Replace

Upfront Cost ${fmt(repairCost)} ${fmt(totalReplaceCost)}

Annual Energy Cost ${fmt(annualEnergy)}/yr ${fmt(newAnnualEnergy)}/yr

Future Repair Allowance (PV) ${fmt(futureRepairs / Math.pow(1+r,2.5))} $0

NPV Total Cost (${years} yrs @ ${discountRate}%) ${fmt(npvRepair)} ${fmt(npvReplace)}

50% Rule Check Repair = ${fmtD(fiftyPctRatio)}% of replacement cost Threshold: 50% = ${fmt(fiftyPctThreshold)} ${rule50Repair ? '✅ Below threshold — repair viable' : '❌ Above threshold — replace recommended'}

Pump Age Analysis Age: ${fmtD(age)} yrs / Avg lifespan: ${info.avg} yrs Remaining life: ~${fmtD(remainingLife)} yrs Adjusted pump value: ${fmt(adjustedPumpValue)} ${depthSurcharge > 0 ? 'Depth surcharge: ' + fmt(depthSurcharge) + '' : ''} ${pumpOld ? '⚠ At/past expected lifespan' : '✅ Within expected lifespan'}

NPV Savings (Replace vs Repair)
${npvSavings >= 0
? '✅ Replacing saves ' + fmt(npvSavings) + ' over ' + years + ' yrs'
'🔧 Repairing saves ' + fmt(-npvSavings) + ' over ' + years + ' yrs'}

Energy Savings Payback Annual energy saved: ${fmt(annualEnergySaved)}/yr ${paybackYears === Infinity || paybackYears

⚠ Always obtain 2–3 quotes from licensed well contractors. Costs vary significantly by region, pump brand, and site conditions.

`; }

#### Formulas Used

50% Rule: If Repair Cost > 50% × Replacement Cost → Replace

Net Present Value (NPV):

NPV_repair = RepairCost + FutureRepairs/(1+r)^2.5 + Σ[t=1..N] AnnualEnergy/(1+r)^t NPV_replace = TotalReplaceCost + Σ[t=1..N] (AnnualEnergy × (1 − EnergySavings%))/(1+r)^t where r = discount rate, N = analysis period in years

Depth Surcharge (submersible): $2.00 × (Depth − 50 ft) for depths > 50 ft

Adjusted Pump Value: ReplacementCost × (RemainingLife / AvgLifespan)

Simple Payback: (ReplaceCost − RepairCost) / AnnualEnergySaved

#### Assumptions & References

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References

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