Whats the difference between constant wattage and self-regulating systems?
Self regulating systems are essentially more sophisticated than constant wattage products, which tend to be more basic and lower priced, and which must be used in conjunction with a thermostat. Constant wattage products will often withstand higher temperatures than self regulating systems, but they cannot be used on plastic pipework. Self regulating systems can be used with or without a thermostat (although using a thermostat is recommended) and they do not produce hot spots, even if they are overlapped. Generally, self-regulating systems are used more widely except with regard to high temperature applications.
