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WHY XTEND?

 
Xtend on its own has many benefits, but what happens if you want to take your energy saving journey further?

Xtend enables a more cost-effective and efficient approach to minimising electricity purchase costs in a home. The capital and maintenance costs are minimised and the savings maximised.

Within the Xtend team we have years of experience in:

  • geyser design and manufacturing

  • design, installation and support of solar thermal, heat pump and direct to geyser solar PV systems, as well as combinations of these.

  • Solar PV and batteries.

Our philosophy is to bring the geyser into your energy eco-system, instead of isolating it and to combine this with solar PV. This can be done in a phased manner, or all at once depending on budget.

Solar thermal and heat pumps have been the only true solutions to reducing energy requirements. These systems purport to save around 70% of the water heating costs. They have relatively high capital costs, and the energy is only ever applied to the geyser. They also have maintenance costs that should be considered.

Geyser timers will save money by reducing standing losses or heating only a portion of the water when required. These are cost effective and play a useful role in hot water energy management.

Arrow WHERE DOES XTEND FIT IN?

Xtend heats water 25% more efficiently than a standard element. A house typically uses most energy in the morning and evenings. Sun power his highest in the middle of the day.

Solar PV and battery costs have reduced by around 60% in the last 5 years. The systems are stable and require little maintenance. Instead of spending money on a system where the energy can only go to the geyser, install a system that generates electricity that can be used in the whole house and send the spare power generated in the middle of the day to the geyser.

Xtend is not THE silver bullet, although it may look like one. It is another very useful tool is to suite of solutions toward an efficient energy future.

On a large scale, heat pumps and solar thermal have clear investment cases. We believe that in the residential market the service costs make these less attractive.

Arrow XTEND has two key properties that enable a different approach:

  1. 25-33% lower instantaneous draw than a standard element to achieve the same rate of heating
  2. 20-25% less kWh to achieve the same thermal heating

Arrow COST AND PAYMENT DIFFERENT OPTIONS

 
Cost Comparison chart
 

Arrow SOLAR THERMAL

Thermosiphon systems (tank on the roof) are cheaper, require less maintenance and have better returns than the pumped systems. Most solar thermal systems have a pump as the geyser is in the roof. These systems require maintenance for two key reasons.

  • The pump may need servicing or replacing.
  • The non-return valve gets blocked
    • This can go undetected
    • The element is used to generate heat that is radiated out into the atmosphere.
    • This ends up costing more money than having no solar at all.

If you use hot water in the morning and the evening, then solar will not deliver the 70% savings that is commonly discussed unless you heat enough hot water stored to last until the next day. This requires a larger system with a higher cost.

In our experience a 150L solar thermal system will not deliver the promised 70% savings, but closer to 50% for the average family. Most homes use hot water in the morning and the evening. As a result the element is required during the night, even in summer.

Maintenance: Medium. You can ignore servicing, but this could prove more expensive.

Arrow HEAT PUMPS

The advantage of a heat pumps is that they use less energy than an element 24/7. Efficiency varies depending on ambient air temperature and the hot water temperature required. Averaged over a year these are widely agreed to be around 70%.

Heat pumps require annual servicing. In our experience they often require additional servicing and repairs. (blocked filters, re-gassing, compressor issues, pump problems and various other equipment faults)

When servicing and maintenance costs are factored into heat pump ownership in a residential environment the payback period is not as attractive as it looks on paper.

Maintenance: High

Arrow XTEND

  • Xtend is easy to install and has a 3 year warranty.
  • The geyser can be located anywhere.
  • Xtend has a lower maintenance requirement than a standard element.
  • There are no additional parts or pipes around the geyser that add maintenance cost.

Xtend uses 15-25% less power than a standard element, 24/7.

The saving against a standard element varies depending on geyser manufacturer and age of element. As a standard element starts to scale up it will use more energy to achieve the same heating result. Xtend develops less scale build up. In very hard water areas Xtend can be removed and cleaned to ensure it is always operating at maximum efficiency.

Maintenance: Zero for normal water conditions and lower than normal for hard water areas

Arrow XTEND PLUS SOLAR PV - NO BATTERIES

Solar PV is an extremely mature and stable technology. Costs have reduced astoundingly in the last 10 years and continue to do so. Maintenance is near zero except for cleaning the panels from time to time.

The issue with solar in a home is that the time of peak power generation is in the middle of the day. Homes typically use power most in the mornings and evenings. To move this power requires batteries…. Or a water tank to store hot water for later.

Arrow TYPICAL HOME POWER USE V SOLAR GENERATION

 
HOMEUSE2
 

Xtend with a geyser timer set for the middle of the day will absorb the surplus solar energy generated. Using Xtend will a) add 15-25% additional heat energy to the water for the same electrical energy and b) draw less instantaneous power.

Xtend and a small solar PV system will now cost around the same amount as a solar thermal or heat pump system and deliver higher energy savings and lower maintenance costs.

Maintenance: Extremely low

Arrow XTEND PLUS SOLAR PV - BATTERY

This is an enhancement on the solution above. The battery is used during the night. During the morning the battery is charging. Most domestic appliance use typically happens in the morning. You can see in the figure below that once the batteries are full the solar generation potential is lost as the only energy required is for the low house load.

 
generation
 

Turning on the geyser after the battery is full will maximise power generation of the PV system and minimise purchase costs.

If hot water is used morning and evening, one should consider adding an additional geyser instead of batteries. Think of this as a thermal battery. A geyser is far cheaper than a chemical battery and can take as much or as little energy as you choose to supply.

Battery costs have reduced significantly and will continue to do so. Balancing batteries with hot water storage will minimise capital costs and maximise savings.

Maintenance: Low, but higher as batteries can have challenges.

Arrow OUR CONCLUSION

Xtend combined with solar PV will provide the best overall energy reduction solution to a home. Capital and maintenance costs are minimised.

WHY XTEND?

Xtend on its own has many benefits, but what happens if you want to take your energy saving journey further?

Xtend enables a more cost-effective and efficient approach to minimising electricity purchase costs in a home. The capital and maintenance costs are minimised and the savings maximised.

Within the Xtend team we have years of experience in:

  • geyser design and manufacturing

  • design, installation and support of solar thermal, heat pump and direct to geyser solar PV systems, as well as combinations of these.

  • Solar PV and batteries.

Our philosophy is to bring the geyser into your energy eco-system, instead of isolating it and to combine this with solar PV. This can be done in a phased manner, or all at once depending on budget.

Solar thermal and heat pumps have been the only true solutions to reducing energy requirements. These systems purport to save around 70% of the water heating costs. They have relatively high capital costs, and the energy is only ever applied to the geyser. They also have maintenance costs that should be considered.

Geyser timers will save money by reducing standing losses or heating only a portion of the water when required. These are cost effective and play a useful role in hot water energy management.

Arrow WHERE DOES XTEND FIT IN?

Xtend heats water 25% more efficiently than a standard element. A house typically uses most energy in the morning and evenings. Sun power his highest in the middle of the day.

Solar PV and battery costs have reduced by around 60% in the last 5 years. The systems are stable and require little maintenance. Instead of spending money on a system where the energy can only go to the geyser, install a system that generates electricity that can be used in the whole house and send the spare power generated in the middle of the day to the geyser.

Xtend is not THE silver bullet, although it may look like one. It is another very useful tool is to suite of solutions toward an efficient energy future.

On a large scale, heat pumps and solar thermal have clear investment cases. We believe that in the residential market the service costs make these less attractive.

Arrow XTEND has two key properties that enable a different approach:

  1. 25-33% lower instantaneous draw than a standard element to achieve the same rate of heating
  2. 20-25% less kWh to achieve the same thermal heating

Arrow COST AND PAYMENT DIFFERENT OPTIONS

Cost Comparison chart

Arrow SOLAR THERMAL

Thermosiphon systems (tank on the roof) are cheaper, require less maintenance and have better returns than the pumped systems. Most solar thermal systems have a pump as the geyser is in the roof. These systems require maintenance for two key reasons.

  • The pump may need servicing or replacing.
  • The non-return valve gets blocked
    • This can go undetected
    • The element is used to generate heat that is radiated out into the atmosphere.
    • This ends up costing more money than having no solar at all.

If you use hot water in the morning and the evening, then solar will not deliver the 70% savings that is commonly discussed unless you heat enough hot water stored to last until the next day. This requires a larger system with a higher cost.

In our experience a 150L solar thermal system will not deliver the promised 70% savings, but closer to 50% for the average family. Most homes use hot water in the morning and the evening. As a result the element is required during the night, even in summer.

Maintenance: Medium. You can ignore servicing, but this could prove more expensive.

Arrow HEAT PUMPS

The advantage of a heat pumps is that they use less energy than an element 24/7. Efficiency varies depending on ambient air temperature and the hot water temperature required. Averaged over a year these are widely agreed to be around 70%.

Heat pumps require annual servicing. In our experience they often require additional servicing and repairs. (blocked filters, re-gassing, compressor issues, pump problems and various other equipment faults)

When servicing and maintenance costs are factored into heat pump ownership in a residential environment the payback period is not as attractive as it looks on paper.

Maintenance: High

Arrow XTEND

  • Xtend is easy to install and has a 3 year warranty.
  • The geyser can be located anywhere.
  • Xtend has a lower maintenance requirement than a standard element.
  • There are no additional parts or pipes around the geyser that add maintenance cost.

Xtend uses 15-25% less power than a standard element, 24/7.

The saving against a standard element varies depending on geyser manufacturer and age of element. As a standard element starts to scale up it will use more energy to achieve the same heating result. Xtend develops less scale build up. In very hard water areas Xtend can be removed and cleaned to ensure it is always operating at maximum efficiency.

Maintenance: Zero for normal water conditions and lower than normal for hard water areas

Arrow XTEND PLUS SOLAR PV - NO BATTERIES

Solar PV is an extremely mature and stable technology. Costs have reduced astoundingly in the last 10 years and continue to do so. Maintenance is near zero except for cleaning the panels from time to time.

The issue with solar in a home is that the time of peak power generation is in the middle of the day. Homes typically use power most in the mornings and evenings. To move this power requires batteries…. Or a water tank to store hot water for later.

Arrow TYPICAL HOME POWER USE V SOLAR GENERATION

HOMEUSE2

Xtend with a geyser timer set for the middle of the day will absorb the surplus solar energy generated. Using Xtend will a) add 15-25% additional heat energy to the water for the same electrical energy and b) draw less instantaneous power.

Xtend and a small solar PV system will now cost around the same amount as a solar thermal or heat pump system and deliver higher energy savings and lower maintenance costs.

Maintenance: Extremely low

Arrow XTEND PLUS SOLAR PV - BATTERY

This is an enhancement on the solution above. The battery is used during the night. During the morning the battery is charging. Most domestic appliance use typically happens in the morning. You can see in the figure below that once the batteries are full the solar generation potential is lost as the only energy required is for the low house load.

generation

Turning on the geyser after the battery is full will maximise power generation of the PV system and minimise purchase costs.

If hot water is used morning and evening, one should consider adding an additional geyser instead of batteries. Think of this as a thermal battery. A geyser is far cheaper than a chemical battery and can take as much or as little energy as you choose to supply.

Battery costs have reduced significantly and will continue to do so. Balancing batteries with hot water storage will minimise capital costs and maximise savings.

Maintenance: Low, but higher as batteries can have challenges.

Arrow OUR CONCLUSION

Xtend combined with solar PV will provide the best overall energy reduction solution to a home. Capital and maintenance costs are minimised.

 
TESTIMONIALS