Water leaking from the base of the Certikin pool heater or from pipe connections nearby.

Safety first: Isolate electrical power and, for gas heaters, turn off the gas supply. Hot water and sharp metal edges can cause injury.

• Identify leak source: Dry the area and observe where water first appears – at unions, drain plugs, or from inside the casing.
• Tighten unions: Gently tighten plastic or brass unions on the heater connections by hand, then a small additional turn with a wrench if needed. Do not overtighten plastic fittings.
• Check drain plugs: Ensure any winterisation drain plugs on the Certikin heater are fully reinstalled and sealed.
• Inspect for corrosion: If water appears from within the casing or around the heat exchanger body, internal corrosion or freeze damage is likely.

Internal heat exchanger leaks usually require replacement of the exchanger or heater and should be assessed by a pool heating specialist.