FREQUENTLY ASKED QUESTIONS

 
Below are answers to questions we get asked most by our customers. If you have any further questions, please get in touch.

FAQ's

Below are answers to questions we get asked most by our customers. If you have any further questions, please get in touch.

FREQUENTLY ASKED QUESTIONS

Below are answers to questions we get asked most by our customers. If you have any further questions, please get in touch.

 

Standard Resistive Elements

XTEND Elements

Use a coiled wire to turn electricity into heat. This has not changed much in 100 years

Use a positive temperature coefficient (PTC) ceramic to convert electrical energy into thermal energy

Surface temperature of around 500°C

Surface temperature of 270°C

Varying metal alloys encase the coiled wire. These are all relatively soft and prone to corrosion and scale build-up which cause failure

Encased in marine-grade (316) stainless steel

Large surface area to reduce the impact of scale build-up

Design makes the XTEND element easy to descale

Burn out when geyser empties or scale build-up becomes too much. Loses efficiency over time, operating at about 50% when they burn out & fail

Scale build-up is significantly reduced

XTEND element will switch off when 270°C is reached. It will not burn out and can be cleaned or installed in a replacement geyser and work as designed

Reducing the temperature from 500°C to 270°C slows the process of scale build-up and other negative chemical reactions. The rate of heating is not affected as the XTEND element has a far bigger surface area through which to exchange heat.

XTEND elements require a thermostat. The set temperature is typically around 10°C lower for an XTEND than a standard element, this is because the thermostat is positioned lower on the XTEND flange element range.

The XTEND element design also reduces system heating losses, reducing the electricity required to heat your water.

In an average family home, an XTEND element uses around 1,000 units less electricity than a standard element.

This equates to a payback period of 12-18 months.

XTEND elements have a 3-year warranty and are designed to last 10 years.

XTEND elements are actually an affordable way to reduce the cost of your most expensive appliance.

Positive Temperature Coefficient. A PTC element’s electrical resistance rises extremely rapidly as it reaches the set temperature. With XTEND this is 270°C. The resistance becomes so high at the design set-point (Curie point) that electricity cannot flow through the element.

PTC has a low-watt density. This is the amount of power for the surface area.

No additional fittings or thermostats are needed. XTEND elements are installed with the same parts used for a standard element.

We would strongly advise installing a new thermostat when installing an XTEND element as it is standard good practice to change the thermostat at the same time as the element. Naturally if the geyser is new, you should not need to change the element.

Yes, for various reasons. If you use less than the full volume of your geyser then using a timer to heat up only a portion of the geyser when you use it will save money in two ways:

  1. You heat up less water
  2. You are storing colder water which loses less heat to the air. This reduces standing losses

If you have solar PV (electricity) panels, then you can heat your geyser for free using the power from these solar panels. To do this you need to set the timer to work during the sunlight hours. Adjusting this timing can help to maximise the savings and returns on solar systems.

Heat rises, the hottest water is at the top of the tank. Only when the water at the thermostat level reaches the set temperature will the element turn off.

The thermostat position with the XTEND flange (Kwikot, Heattech) element is lower than a standard element. As a result, the thermostat needs to be set to a lower setting. Around 10°C is about right.

The hotter the water in the tanks, the higher the standing losses, but the more baths and showers it can support. How hot to set the geyser depends on the hot water consumption patterns of the building.

In a home, a temperature setting of 40-45°C is about right for an XTEND element.

This depends on how you use hot water. The image below shows the heating times.

Generally, we recommend a 2kw XTEND element for 100L & 150L geysers, and a 3kw XTEND element for 200L or larger geysers. The choice depends on many factors, including usage patterns and the number of people using the geyser.

The advantage of using a lower power element is that is fits very well with solar PV systems, allowing the homeowner to, when budgets further allow, significantly reduce their electricity bill.

XTEND elements are made with a marine-grade stainless steel case to protect the PTC chips. This casing, combined with the lower operating temperature of 270°C, lower watt density, bigger surface area and other design features make XTEND elements extremely hardwearing.

XTEND elements build up scale slower and thinner than a standard element. In addition, XTEND elements are easily cleaned if the limescale build-up is significant as they can be serviced in hard water areas.

See more details and before and after photos...

Yes. XTEND elements have been tested and passed for SANS 514.

XTEND elements will last significantly longer than standard elements. Hard water will have an impact on XTEND elements eventually.

XTEND elements have been tested to 21000 heating cycles. This is over 7 years of normal usage. We would expect the electrical components to last longer than this.

The stainless-steel case is corrosion resistant. It can also be cleaned to remove scale build-up. We recommend this in very hard water conditions.

If the geyser anode is not replaced, this may have a negative impact on the life of the XTEND element.

XTEND elements will also not burn out and need replacing should the geyser suddenly empty. XTEND elements will turn on to get to 270°C and then off for around 10 minutes, then on for a minute and off again. Each of these ON/OFF cycles is known as a dry burn cycle. XTEND is tested to 5000 dry burn cycles.

Read More...

Yes. Solar thermal systems use the element to boost heat at night and in winter when required. Any time that an element is used, XTEND elements will reduce the electricity costs.

Anybody who is authorised to install normal elements. The installation is exactly the same.

Standard Resistive Elements

XTEND Elements

Use a coiled wire to turn electricity into heat. This has not changed much in 100 years

Use a positive temperature coefficient (PTC) ceramic to convert electrical energy into thermal energy

Surface temperature of around 500°C

Surface temperature of 270°C

Varying metal alloys encase the coiled wire. These are all relatively soft and prone to corrosion and scale build up which cause failure

Encased in marine-grade (316) stainless steel

Large surface area to reduce impact of scale build-up

Design makes XTEND easy to descale

Burn out when geyser empties or scale build-up becomes too much

Scale build-up is significantly reduced

XTEND will switch off when 270°C is reached. It will not burn out and can be cleaned or installed in replacement geyser and work as designed

Reducing the temperature from 500°C to 270°C slows the process of scale build-up and other negative chemical reactions. The rate of heating is not affected as XTEND elements have a far bigger surface area through which to exchange heat.

XTEND elements require a thermostat. The set temperature is typically around 10°C lower for an XTEND element than a standard element, this is because the thermostat is positioned lower on the XTEND flange element range.

The XTEND element design reduces system heating losses, reducing the electricity required to heat your water.

In an average family home, an XTEND element uses around 1,000 units less electricity than a standard element.

This equates to a payback period of 12-18 months.

XTEND elements have a 3-year warranty and are designed to last 10 years.

XTEND elements are actually an affordable way to reduce the cost of your most expensive appliance.

Positive Temperature Coefficient. A PTC element’s electrical resistance rises extremely rapidly as it reaches the set temperature. With XTEND this is 270°C. The resistance becomes so high at the design set-point (Curie point) that electricity cannot flow through the element. PTC has a low-watt density. This is the amount of power for the surface area.

No additional fittings or thermostats are needed. XTEND elements install with the same parts as a standard element.

We would strongly advise installing a new thermostat when installing an XTEND element as the two have to work together for a long time.

Yes, for various reasons. If you use less than the full volume of your geyser then using a timer to heat up only a portion of the geyser when you use it will save money in two ways:

  1. You heat up less water
  2. You are storing colder water which loses less heat to the air. This reduces standing losses

If you have solar PV (electricity) panels, then you can heat your geyser for free using the power from these solar panels. To do this you need to set the timer to work during the sunlight hours. Adjusting this timing can help to maximise the savings and returns on solar systems.

Heat rises, the hottest water is at the top of the tank. Only when the water at the thermostat level reaches the set temperature will the element turn off.

The thermostat position with the XTEND flange (Kwikot, Heattech) element is lower than a standard element. As a result, the thermostat needs to be set to a lower setting. Around 10°C is about right.

The hotter the water in the tanks, the higher the standing losses, but the more baths and showers it can support. How hot to set the geyser depends on the hot water consumption patterns of the building.

In a home, a temperature of 40-45°C is about right for an XTEND element.

This depends on how you use hot water. The image below shows the heating times.

Generally, we recommend a 2kw XTEND element for 100L & 150L geysers, and a 3kw XTEND element for 200L or larger geysers. The choice depends on many factors, including usage patterns and the number of people using the geyser.

The advantage of using a lower power element is that is fits very well with solar PV systems, allowing the homeowner to, when budgets further allow, significantly reduce their electricity bill.

XTEND is made with a marine-grade stainless steel case to protect the PTC chips. This casing, combined with the lower operating temperature of 270°C, lower watt density, bigger surface area and other design features make Xtend extremely hardwearing.

XTEND elements build up scale more slowly and more thinly than a standard element.

Read More...

Yes. XTEND elements have been tested and passed for SANS 514.

XTEND elements will last significantly longer than standard elements. Hard water will have an impact on XTEND element eventually.

XTEND elements have been tested to 21000 heating cycles. This is over 7 years of normal usage. We would expect the electrical components to last longer than this.

The stainless-steel case is corrosion resistant. It can also be cleaned to remove scale build up. We recommend this in very hard water conditions.

If the geyser anode is not replaced, this may have a negative impact on the life of the XTEND element.

XTEND elements will also not burn out and need replacing should the geyser suddenly empty. XTEND elements will turn on to get to 270°C and then off for around 10 minutes, then on for a minute and off again. Each of these ON/OFF cycles is known as a dry burn cycle. XTEND elements have been tested to 5000 dry burn cycles.

Read More...

Yes. Solar thermal systems use the element to boost heat at night and in winter when required. Any time that an element is used, XTEND element will reduce the electricity costs.

Anybody who is authorised to install normal elements. The installation is exactly the same.