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A few facts that will help you decide on a Heater for your aquarium
Technology advances have bought us super accurate electronic aquarium water heaters which can maintain the water temperature to the preset value ± 0.2C° when used within their rated parameters. Luckily in Perth we have a warm climate with only a few very cold days and nights each year. The differential temperature between unheated aquarium water on a cold night in Perth and the more ideal 26C° requirement is easily handled by relatively low wattage heaters. As a general rule of thumb, a Glass Heater needs to be about 1 Watt per Litre (ie: 300W for 300L) of aquarium water and a Stainless Steel or Titanium Heater needs to be about 0.8 Watt per Litre (ie: 250W for 300L). Aquariums located in well temperature regulated areas of course do not need a heater as large because they only need to cover a small temperature differential (ie: inside an air conditioned, insulated location, held at around 24-25C° year round - differential is only about 4C°).
When choosing a Heater for your aquarium, you should consider several factors:
Volume of Water to be heated
Importance of price versus performance
Power Consumption and Efficiency
Temperature differential at the aquarium location (inside, outside, air-conditioned, insulation, etc.)
Glass Heaters are cheap to buy but generally do not last very long. Most will fail within 2-5years.
Titanium Heaters are more expensive but suitable to Marine salt water environments, they last >5years.
Stainless Steel heaters are the best choice as they are relatively cheap, last for many years (~10yrs), use less power (more efficient than glass heaters) and not likely to cause any electrical faults / shorting. In Marine salt water environments, Titanium is certainly your best choice.
Electronic Heaters use a separate Temperature probe in a central position in the aquarium water and very accurately regulate the water temperature to within about 0.2 degrees of the set value. There are a number of Heaters in the marketplace that attempt to do this with a built-in probe but these units are more a novelty than a precision device. All good quality Heaters these days, use an Inert Gas or Nitrogen element chamber to reduce element degradation / oxidizing which gives the heater exceptionally long life in use. The Heating Element in these Heaters will generally last 10-15 years.
As your aquarium is most likely located inside an insulated and/or air-conditioned home or shed, there is usually a minimal requirement for a Water Heater, even in the middle of winter. Many hobbyists use heaters sparingly as their homes are air conditioned around 24C°. Setting the Heater to around 26-27C°means they only need a small heater to cope with the small ambient V's water temperature differential (~4C°). Water is always cooler than the ambient air temperature by ~1.45C° due to evaporation dampening effects. A 600L aquarium in this situation would only require a 200 - 300W Heater to maintain water at 27C°. Tank water should be moved strongly by a pump / powerHead / Wave Maker to aid in water temperature uniformity.
Similarly, Large Tanks are better heated from near the centre of the tank rather than from 1 end.