While we have strived to make this selection tool as accurate as possible, it is impossible to consider every factor during the selection process. For this reason, the selection tool should be used as a general guide only.

If the distance between water heater and any outlet in your dwelling is greater than 15 metres, please contact us for more advice.

Assumed hot water usage is 40L / day / person.

Seasonal cold water temperature is calculated via the STC postcode zones and are as follows:

• Zone 1: 25°C
• Zone 2: 18°C
• Zone 3: 18°C
• Zone 4: 14°C
• Zone 5: 12°C

The following factors are not taken into consideration during this tools calculations:

• Insulation
• Pipework length (long distances)
• Voltages
• Multiple simultaneous fixtures
• Commercial large load usage

If you require assistance or have any question, don't hesitate to contact us.

Heat Pumps
Hot Water Heat Pumps utilise a refrigerant circuit to create hot water from extracted energy out of the surrounding air. Heat pumps are an energy-efficient method of heating water. They rely on air passing through the appliance to operate, so outdoor installation is preferred. Installing heat pumps indoors is also possible, provided the room adheres to minimum volume requirement.

Instantaneous Water Heaters
Instantaneous water heaters utilise a bare-wire element to rapidly heat water as it passes through the appliance, therefore creating an endless supply of hot water without the need for a storage tank. The heating ability of an instantaneous water heater heavily depends on the incoming cold water temperature. Therefore a three-phase connection is required to service a shower in most of Australia. Instantaneous water heaters require appropriate shelter, such as a meter box cover, when installing the appliance outdoors.

Small Storage Water Heaters
Small storage water heaters are ideal for supplying hot water to an outlet which may be located some distance from a central hot water supply, for example, an outdoor BBQ area or an office kitchenette. They utilise small electrical elements which rapidly heat the volume of water. While generally only up to 15L, they boast excellent recovery times and energy-efficiency features.

Single vs. Three Phase: Which One Do I Need?
STIEBEL ELTRON has water heaters available in both three-phase and single-phase connections. For instantaneous water heaters, your incoming cold water temperature significantly affects product suitability. For this reason, you require a three-phase connection to service a shower in most regions of Australia. Single-phase water heaters also include all STIEBEL ELTRON storage water heaters.

Three Phase
New builds, apartment complexes and dwellings located near industrial areas are more likely to have three-phase power available. Generally, if three-phase is available at a premise, then a single-phase connection is also available. Check with an electrician or your electricity provider to determine how many Ampers of three-phase power is available.

Single Phase
All dwellings connected to electricity at a minimum have a single-phase connection available. The question then becomes the available current, as even single-phase electric instantaneous water heaters require at least 20A. Check with an electrician or your electricity provider to determine how many Ampers of single-phase power is available.

How Do I Know If I Have Three-Phase Avaliable?
Your electrical provider, body corporate or electrician should be able to inform you of the availability of three-phase power in your dwelling. The easiest way, however, is to speak to an electrician and request a quote to have a three-phase connection installed, as quotes are usually free.