Geyser repair vs replace in South Africa: how to decide

The 40% rule

The general rule in South Africa: if the repair cost exceeds 40% of the cost of a new installed geyser, replace it. On a R9,000 installed geyser, that means any repair over R3,600 should trigger a replacement conversation.

When to repair

Repair makes sense when:

• The geyser is under 8 years old — at 8 years you have at least 4–6 more years of life in most cases
• The tank is structurally sound — no rust staining on the outside, no visible corrosion at connections
• The fault is a single replaceable component: element (R400–R800), thermostat (R350–R600), pressure control valve (R250–R500), or temperature/pressure relief valve (R300–R600)
• Repair cost is under R2,500 for a geyser in good condition

When to replace

Replace when:

• Geyser is over 12 years old — inner lining erodes and rust enters your water supply
• Tank is leaking — no component repair fixes a cracked or corroded tank; replacement is the only option
• You've had two or more component failures in 24 months — the unit is reaching end-of-life
• Water is discoloured (rust-coloured hot water) — tank lining has degraded; a new element won't fix this
• Geyser is a non-standard size or discontinued model — parts may no longer be available

Use a replacement as an upgrade opportunity

If you're replacing anyway, consider upgrading to a heat pump or solar geyser — both reduce water heating costs by 60–80%. A standard electric geyser costs R600–R900/month to run. A heat pump costs R150–R300/month. Over 10 years, the saving is R36,000–R72,000.

Geyser lifespan guide

Need a plumber to assess your geyser? Get free quotes from PIRB-registered plumbers in your area.