Never enough hot water

Cause

Water heater undersized for hot water demand

Repair

  • if the water heater is undersized for the demand:
    • reduce hot water usage to remain within the cylinder capacity (for example, fit low flow shower heads to showers or aerator taps to hand basins)
    • replace the cylinder
  • when determining the size of a hot water cylinder, the water heater should be able to maintain 75% of its capacity as hot water; for example, where there is a demand of 135 litres, a 180 litre cylinder should be installed

Cause

Crossed hot and cold water connections due to faulty plumbing installation

Repair

  • to check for a crossed connection:
    • close the water shut-off valve
    • turn on a hot water faucet
    • if there is water flow, there is a crossed connection in the system

Cause

Faulty heating element 

Repair

  • check for power to the elements; replace elements as required

Cause

Thermostat setting too low

Repair

  • check for power at the thermostats; replace as required