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Instant Electric Hot Water Systems & Heaters

All about Electric Instantaneous Hot Water Heaters

Electric Instantaneous Hot Water systems are popular in apartments and some small houses due to their space saving nature and their ability to heat water on demand.

How Electric Instantaneous Hot Water Heaters work

Electric instantaneous hot water systems work by water flowing over an immersion element heating the water to the designed temperature. Electric Instantaneous hot water systems are available in both single phase and three phase units.

Single phase as the name suggests has one phase connected to the hot water system. Therefore, a single phase unit is unable to put the same amount of energy into the water supply. Due to this reason, I only recommend the single phase units in warmer parts of the country. For example, on a 30 amp model the maximum temperature increase for 5 litres per minute will be 20 degrees. This means that if you live in one of the southern states and your cold water inlet temperature is only 10 degrees the max shower temperature at 5 litres per minute will be 30 degrees.

Three phase units will obviously have three phase electricity and can therefore add more electricity than the single phase units. As such, the flow rates and temperature will be substantially higher. Though the flow rates are still not as good as a storage tank they are usually more than enough for a regular shower.

Brands of Instantaneous & On-Demand Hot Water Heaters

Brands of Electric Instantaneous include: Stiebel Eltron, Zip, Wilson and Microheat. Check out the Instantaneous Electric Comparison Table at the end of the page to compare brands, phases, and warranty.

Here is a breakdown of the benefits and some shortcomings of Electric Instantaneous Hot Water Systems:

Pros of Electric Instantaneous Hot Water Systems

  • Take up a very small amount of space
  • Endless hot water also known as “On Demand Hot Water”
  • Good longevity

Cons of Electric Instantaneous Hot Water Systems

  • Flow rates less than storage tanks
  • In most cases require 3 phase electricity
  • When they fail it is harder to find experienced tradespeople
  • More costly for parts and to repair

On this page I have provided a general overview about Electric Instantaneous Hot Water Systems direct from a hot water specialist. If you want more specific information for your particular situation please phone us now on 1300 721 996 and we are more than happy to help figure out if an electric instantaneous or on demand hot water heater is a suitable fit for you and your family.

ZipDBX1828c rise @ 9.2l/m25.0Amp/18.0kWMax 5035ZipDBX2728c rise @ 13.8l/m37.6Amp/27.0kWMax 5035ZipCEX925c rise @ 5.0l/m40.0Amp/27.3kWMax 5015ZipCEX9-U25c rise @ 5.8l/m40.0Amp/9.6kWMax 5015ZipDEX28c rise @ 13.8l/m39.0Amp/27.0kW50 and 6035ZipDSX28c rise @ 13.8l/m39.0Amp/27.0kW20-6035ZipMCX312c rise @ 4.0l/m15.0Amp/3.5kWup to 5015ZipMCX416c rise @ 4.0l/m19.0Amp/4.4kWup to 5015ZipMCX612c rise @ 4.0l/m25.0Amp/5.7kWup to 5015Stiebel EltronDHCE 6/5025c rise @ 4.0l/m29.6Amp/7.1kW5015Stiebel EltronDHCE 8/5033c rise @ 4.0l/m29.6Amp/9.5kW5015Stiebel EltronDHCE 8/6033c rise @ 4.0l/m29.6Amp/9.5kW6015

Electric Instantaneous Heaters
BrandModelTemperature rise per litreAmps/kWTemperature AdjustmentPhasesWarranty
Stiebel EltronDHE 18 AU27c rise @ 10l/m27.0Amp/19.4kWTemperature adjustable 20-60 degrees35
Stiebel EltronDHE 27 AU41c rise @ 10l/m40.0Amp/29.1kWTemperature adjustable 20-60 degrees35
Stiebel EltronDEL 13 Plus21c rise @ 10l/m20.2Amp/14.5kWTemperature adjustable 30-50 degrees35
Stiebel EltronDHE 18 Plus27c rise @ 10l/m27.0Amp/19.4kWTemperature adjustable 30-50 degrees35
Stiebel EltronDEL 2739c rise @ 10l/m38.9Amp/28.0kWTemperature adjustable 30-50 degrees35
Stiebel EltronDHB-E 13 LCD21c rise @ 10l/m20.2Amp/14.5kWTemperature adjustable 20-60 degrees35
Stiebel EltronDHB-E 18 LCD27c rise @ 10l/m27.0Amp/19.4kWTemperature adjustable 30-50 degrees35
Stiebel EltronDHB-E 27 LCD41.0c rise @ 10l/m38.9Amp/28.0kWTemperature adjustable 30-50 degrees35
Stiebel EltronDHF 13 C-AU21c rise @ 10l/m19.7Amp/14.2kWN/A35
Stiebel EltronDHF 15 C-AU23c rise @ 10l/m22.5Amp/16.1kWN/A35
Stiebel EltronSimpleX25c rise @ 4.5l/m20.0Amp/13.2kWN/A35
WilsonSuper X40c rise @ 4.5l/m18.0Amp/13.0kWN/A32
WilsonA5: 20 amp40c rise @ 4.5l/m20.0Amp/14.4kWN/A32
WilsonA5; 23 amp45c rise @ 4.5l/m23.0Amp/16.56kWN/A32
WilsonA5; 18 amp50c rise @ 4.5l/m18.0Amp/12.96kWN/A32

Single Phase Power Systems

  • Stiebel Eltron DHCE 6/50

    Buy Now
  • Stiebel Eltron DHCE 8/50

    Buy Now
  • Stiebel Eltron DHCE 8/60

    Buy Now

Three Phase Power Systems

  • Steibel Eltron DHF13

    Buy Now
  • Stiebel Eltron DEL18

    Supply Only $1,200.00
    Supply & Install
    NSW $1,650.00
    Buy Now Supply & Install (NSW/VIC/QLD)
  • Stiebel Eltron DEL27

    Supply Only $1,250.00
    Supply & Install
    NSW $1,700.00
    Buy Now Supply & Install (NSW/VIC/QLD)
  • Steibel Eltron DHBE Hot Water Heaer

    Stiebel Eltron DHB-E 27

    Buy Now
  • Steibel Eltron DHE18 Hot Water Heaer

    Stiebel Eltron DHE18

    Supply Only $1,480.00
    Supply & Install
    NSW $1,930.00
    Buy Now Supply & Install (NSW/VIC/QLD)
  • Steibel Eltron DHE18 Hot Water Heaer

    Stiebel Eltron DHE27

    Supply Only $1,530.00
    Supply & Install
    NSW $1,980.00
    Buy Now Supply & Install (NSW/VIC/QLD)
  • Stiebel Eltron DHF15 (NSW ONLY)

    Supply Only $870.00
    Supply & Install
    NSW $1,320.00
    Buy Now Supply & Install (NSW/VIC/QLD)
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