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.
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 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.
Pros of Electric Instantaneous Hot Water Systems
Cons of Electric Instantaneous Hot Water Systems
On this page, I have provided a general overview of Electric Instantaneous Hot Water Systems directly 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.
To view the comparison table for various electric instantaneous heaters, please browse this page from your desktop or laptop.
| Electric Instantaneous Heaters | ||||||
|---|---|---|---|---|---|---|
| Brand | Model | Temperature rise per litre | Amps/kW | Temperature Adjustment | Phases | Warranty |
| Stiebel Eltron | DHE 18 AU | 27c rise @ 10l/m | 27.0Amp/19.4kW | Temperature adjustable 20-60 degrees | 3 | 5 |
| Stiebel Eltron | DHE 27 AU | 41c rise @ 10l/m | 40.0Amp/29.1kW | Temperature adjustable 20-60 degrees | 3 | 5 |
| Stiebel Eltron | DEL 13 Plus | 21c rise @ 10l/m | 20.2Amp/14.5kW | Temperature adjustable 30-50 degrees | 3 | 5 |
| Stiebel Eltron | DHE 18 Plus | 27c rise @ 10l/m | 27.0Amp/19.4kW | Temperature adjustable 30-50 degrees | 3 | 5 |
| Stiebel Eltron | DEL 27 | 39c rise @ 10l/m | 38.9Amp/28.0kW | Temperature adjustable 30-50 degrees | 3 | 5 |
| Stiebel Eltron | DHB-E 13 LCD | 21c rise @ 10l/m | 20.2Amp/14.5kW | Temperature adjustable 20-60 degrees | 3 | 5 |
| Stiebel Eltron | DHB-E 18 LCD | 27c rise @ 10l/m | 27.0Amp/19.4kW | Temperature adjustable 30-50 degrees | 3 | 5 |
| Stiebel Eltron | DHB-E 27 LCD | 41.0c rise @ 10l/m | 38.9Amp/28.0kW | Temperature adjustable 30-50 degrees | 3 | 5 |
| Stiebel Eltron | DHF 13 C-AU | 21c rise @ 10l/m | 19.7Amp/14.2kW | N/A | 3 | 5 |
| Stiebel Eltron | DHF 15 C-AU | 23c rise @ 10l/m | 22.5Amp/16.1kW | N/A | 3 | 5 |
| Stiebel Eltron | SimpleX | 25c rise @ 4.5l/m | 20.0Amp/13.2kW | N/A | 3 | 5 |
| Wilson | Super X | 40c rise @ 4.5l/m | 18.0Amp/13.0kW | N/A | 3 | 2 |
| Wilson | A5: 20 amp | 40c rise @ 4.5l/m | 20.0Amp/14.4kW | N/A | 3 | 2 |
| Wilson | A5; 23 amp | 45c rise @ 4.5l/m | 23.0Amp/16.56kW | N/A | 3 | 2 |
| Wilson | A5; 18 amp | 50c rise @ 4.5l/m | 18.0Amp/12.96kW | N/A | 3 | 2 |
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