1.3.16 Cleaning the DHW tank to avoid sediments

1.3.16 Cleaning the DHW tank to avoid sediments


DHW tank efficiency is vulnerable to sediment and it makes rumbling sounds when sediment builds up. The sediment grows depending on the hardness of water and other factors. The efficiency drops as heat transfer surfaces are covered with sediment. Flushing water heater every six months prevents sediment.


  • If the tank is clean, the thermostat reads the correct temperature and the heat transfer surface and heat exchanger maximize efficiency


  • Occupant acceptance

  • Water softener prevents sediment but costs money and it also shortens the life of the tank

Economic assessment

Savings around 2€ per month/extend life

References and best practices

Image gallery


Environment or playable world:

  • Residential

  • Academic

  • Offices

  • All

Carried out by:

  • Public building users

  • Owners

  • Operators

  • All

Reduce consumption of:

  • Heating

  • Cooling

  • DHW

  • Lighting

  • Electric devices

Type of driver:

  • Physical environmental

  • Contextual

  • Psychological

  • Physiological

  • Social

Time framework:

  • Short term
  • Long term

Type of measure:

  • Envelope
  • HVAC
  • DHW
  • Lighting
  • Electrical devices
  • Other
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