FREQUENTLY ASKED QUESTIONS
- Xtend PTC Elements have a ceramic core which makes them incredibly durable, resistance elements have a wound wire core (like an old fashioned light bulb) which is prone to burn out and failure.
- Due to the high temperatures of the standard resistive elements, they accelerate the turning of chlorine in water into a mild solution of Hydrochloric Acid which attacks the anode and thereafter the drum causing catastrophic failure.
- Xtend Elements are manufactured from 316 stainless steel, making them exceptionally durable and resistant to the effects of hard water.
- Xtend Elements have exceptionally low watt density resulting in the longer life of the element, making it less susceptible to overheating caused by scale build-up or sludge. This element will not fail due to scale build-up. They simply reduce power to a minimum operating level without overheating.
- Xtend Elements also use a thermostat (due to legislative requirements) but the element will, by design, automatically reduce power output as the resistance increases (as water warms up).
- Resistive elements are generally set to 60°C, PTC elements are set 10 degrees lower and give the same result.
- Resistive elements have zero capacity to function in air, they fail, usually tripping the electricity – a disaster if one is away.
- Xtend Elements are tested to 5,000 dry burn cycles which means they will not burn out if the geyser has no water in it.
Positive Temperature Coefficient. A PTC element’s electrical resistance rises as the temperature increases. This means that the resistance is very high at the design set-point (Curie point), so electricity cannot flow through the element, and it stops heating any further. The element is self-regulating, so no external thermostat is required, however a thermostat should be fitted as it is required by law.
No additional fittings or thermostats are needed.
The standard element thermostat setting is normally between 60°C and 50°C according to user preferences. Due to the heating properties of the Xtend PTC element we have found that if we set the thermostat to the same setting as a standard element we generate hotter water. Our recommendation is to set the Xtend element’s thermostat to 10°C less than your current setting to achieve the same hot water sensation. If you find that the water is still hotter than what you had you can reduce the thermostat setting even more (5°C increments until you are satisfied that the comfort levels are the same)
Due to the efficiency of the element you will get the same water temperature even though the thermostat is set lower.
The 2000w model is suitable for 150L and 200L geysers.
Xtend Elements are extremely efficient and a smaller size element can be used to obtain the same temperature and volume of hot water in the same time as a larger resistive element.
PTC elements are based on ceramic element technology as opposed to wire in resistive elements.
- The PTC elements heat quickly when resistance is low and decrease as resistance increases.
- PTC Elements are non-linear ie: they will supply higher power when the resistance is low (cold water) and reduce power as resistance increases (hot water). They will only supply power if it is needed from that point on.
Xtend PTC elements are also designed to aid hard water problems through bigger surface area as well as inherent lower element internal temperatures (270°C vs 500°C). Higher temperatures accelerate the precipitation of solids out of the water in a hot water cylinder.
Xtend elements offer a 3-year warranty if used in municipal water. Refer to the warranty / installation booklet provided with the element.
- 21000 heating cycles
- 5000 dry burn cycles
- tested to 2.5 times working voltage
- tested by SABS to SANS 514 specifications