How tankless hot water system works

Instantaneous water heaters heat water directly without the use of a storage tank. When a hot water tap is turned on this allows water to travel through a pipe into the unit. Either a gas burner or an electric element heats the water. As a result, tankless water heaters deliver a constant supply of hot water. You don't need to wait for a storage tank to fill up with enough hot water. However, a tankless water heater's output limits the flow rate.

What you can expect from, tankless water heaters provide hot water at a rate of 7.5 to15 litres per minute. Gas- element burner tankless water heaters produce higher flow rates than electric ones. Sometimes, however, even the largest, gas-fired model cannot supply enough hot water for simultaneous, multiple uses in large households. For example, taking a shower and running the dishwasher at the same time can stretch a tankless water heater to its limit. To overcome this problem, you can install two or more tankless water heaters, connected in parallel for simultaneous demands of hot water. You can also install separate tankless water heaters for appliances -- such as a clothes washer or dishwater -- that use a lot of hot water in your home.

Other applications for demand water heaters include the following:

  • Attached granny flats
  • Hot water for BBQ  Sink
  • Hot tubs and spa
  • Booster for appliances, such as dishwashers or washing machine
  • Booster for a solar hot water system
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